How to find synthesis of data in chemistry - ACT Science

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Question

The Ideal Gas Law is as follows:

is pressure as measured in Pascals, is volume as measured in cubic meters, is the number of moles of the gas, is the gas constant known as 8.314 Joules per mole times Kelvin, and is the temperature measured in Kelvin.

A class of students began studying the Ideal Gas Law and how the Pressure and the Volume relate to one another. They took 20 moles of a sample gas and kept the room at a temperature of 300 Kelvin. They then used different sized containers of the gas to limit and expand the volume. At each different volume, they measure the pressure of the gas on its container. The table they made from their results is seen in table 1.

Volume of the containerPressure Measured in Pascals
1 cubic meter49,884 Pascals
2 cubic meters24,942 Pascals
3 cubic meters16,628 Pascals
4 cubic meters12,471 Pascals
5 cubic meters9,976.8 Pascals
6 cubic meters8,314 Pascals
7 cubic meters7,126.2 Pascals

TABLE 1

And they graph their findings in Figure 1.

Img021

FIGURE 1

Would Figure 1 be the same for 1 mole of hydrogen gas as it would be for 1 mole of oxygen gas?

Answer

Moles is a measure of the amount of any type of gas; the Ideal Gas Law does not need or have a place for a variable type of gas. The number of moles of any type of gas fits into the equation.

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Question

The Ideal Gas Law is as follows:

is pressure as measured in Pascals, is volume as measured in cubic meters, is the number of moles of the gas, is the gas constant known as 8.314 Joules per mole times Kelvin, and is the temperature measured in Kelvin.

A class of students began studying the Ideal Gas Law and how the Pressure and the Volume relate to one another. They took 20 moles of a sample gas and kept the room at a temperature of 300 Kelvin. They then used different sized containers of the gas to limit and expand the volume. At each different volume, they measure the pressure of the gas on its container. The table they made from their results is seen in table 1.

Volume of the containerPressure Measured in Pascals
1 cubic meter49,884 Pascals
2 cubic meters24,942 Pascals
3 cubic meters16,628 Pascals
4 cubic meters12,471 Pascals
5 cubic meters9,976.8 Pascals
6 cubic meters8,314 Pascals
7 cubic meters7,126.2 Pascals

TABLE 1

And they graph their findings in Figure 1.

Img021

FIGURE 1

What would the pressure be if the volume was 100 cubic meters?

Answer

One can plug 100 cubic meters into the equation, but the equation is measured in pascals. To find it in the SI unit kilopascals, one must divide by 1000.

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Question

The Ideal Gas Law is as follows:

is pressure as measured in Pascals, is volume as measured in cubic meters, is the number of moles of the gas, is the gas constant known as 8.314 Joules per mole times Kelvin, and is the temperature measured in Kelvin.

A class of students began studying the Ideal Gas Law and how the Pressure and the Volume relate to one another. They took 20 moles of a sample gas and kept the room at a temperature of 300 Kelvin. They then used different sized containers of the gas to limit and expand the volume. At each different volume, they measure the pressure of the gas on its container. The table they made from their results is seen in table 1.

Volume of the containerPressure Measured in Pascals
1 cubic meter49,884 Pascals
2 cubic meters24,942 Pascals
3 cubic meters16,628 Pascals
4 cubic meters12,471 Pascals
5 cubic meters9,976.8 Pascals
6 cubic meters8,314 Pascals
7 cubic meters7,126.2 Pascals

TABLE 1

And they graph their findings in Figure 1.

Img021

FIGURE 1

If the Kelvin temperature were to rise, what would happen to the pressure?

Answer

As the temperature increases, the pressure a gas puts on its container increases. Warmer temperature means more molecule movement, which makes the pressure higher.

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Question

The Ideal Gas Law is as follows:

is pressure as measured in Pascals, is volume as measured in cubic meters, is the number of moles of the gas, is the gas constant known as 8.314 Joules per mole times Kelvin, and is the temperature measured in Kelvin.

A class of students began studying the Ideal Gas Law and how the Pressure and the Volume relate to one another. They took 20 moles of a sample gas and kept the room at a temperature of 300 Kelvin. They then used different sized containers of the gas to limit and expand the volume. At each different volume, they measure the pressure of the gas on its container. The table they made from their results is seen in table 1.

Volume of the containerPressure Measured in Pascals
1 cubic meter49,884 Pascals
2 cubic meters24,942 Pascals
3 cubic meters16,628 Pascals
4 cubic meters12,471 Pascals
5 cubic meters9,976.8 Pascals
6 cubic meters8,314 Pascals
7 cubic meters7,126.2 Pascals

TABLE 1

And they graph their findings in Figure 1.

Img021

FIGURE 1

If the same 20 moles of the same gas were taken to sea level (at a pressure of 100,000 Pascals) and heated to 300 Kelvin, how large would the volume of the container be to hold it at its new pressure?

Answer

Pressure increases as volume decreases. For the gas to be put at the air pressure at sea level, which is approximtely , the volume must decrease. The equation leads us to , or approximately .

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Question

The Ideal Gas Law is as follows:

is pressure as measured in Pascals, is volume as measured in cubic meters, is the number of moles of the gas, is the gas constant known as 8.314 Joules per mole times Kelvin, and is the temperature measured in Kelvin.

A class of students began studying the Ideal Gas Law and how the Pressure and the Volume relate to one another. They took 20 moles of a sample gas and kept the room at a temperature of 300 Kelvin. They then used different sized containers of the gas to limit and expand the volume. At each different volume, they measure the pressure of the gas on its container. The table they made from their results is seen in table 1.

Temperature in KelvinPressure Measured in Pascals
200 Kelvin16, 628 Pascals
400 Kelvin33, 256 Pascals
600 Kelvin49, 884 Pascals
800 Kelvin66, 512 Pascals

TABLE 1

Img020

FIGURE 1

The graph the students made based on the data is seen in Figure 1.

Pressure is created by the movement of the gas molecules pushing against a container. 0 Kelvin is known as absolute 0, the temperature at which all molecule movement theoretically stops.

Will the pressure of a gas ever be according to this graph?

Answer

The plots on the graph as well as the equation of the Ideal Gas Law do support the idea that when temperature is equal to zero, so is pressure.

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Question

The Ideal Gas Law is as follows:

is pressure as measured in Pascals, is volume as measured in cubic meters, is the number of moles of the gas, is the gas constant known as 8.314 Joules per mole times Kelvin, and is the temperature measured in Kelvin.

A class of students began studying the Ideal Gas Law and how the Pressure and the Volume relate to one another. They took 20 moles of a sample gas and kept the room at a temperature of 300 Kelvin. They then used different sized containers of the gas to limit and expand the volume. At each different volume, they measure the pressure of the gas on its container. The table they made from their results is seen in table 1.

Temperature in KelvinPressure Measured in Pascals
200 Kelvin16, 628 Pascals
400 Kelvin33, 256 Pascals
600 Kelvin49, 884 Pascals
800 Kelvin66, 512 Pascals

TABLE 1

Img020

FIGURE 1

The graph the students made based on the data is seen in Figure 1.

Pressure is created by the movement of the gas molecules pushing against a container. 0 Kelvin is known as absolute 0, the temperature at which all molecule movement theoretically stops.

What would the pressure be if the temperature of the gas was increased to 273 Kelvin?

Answer

The Ideal Gas Law is given with pressure measured in Pascals. If the number 273 Kelvin was plugged into the equation, the number of Pascals that would be .

.

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Question

The Ideal Gas Law is as follows:

is pressure as measured in Pascals, is volume as measured in cubic meters, is the number of moles of the gas, is the gas constant known as 8.314 Joules per mole times Kelvin, and is the temperature measured in Kelvin.

A class of students began studying the Ideal Gas Law and how the Pressure and the Volume relate to one another. They took 20 moles of a sample gas and kept the room at a temperature of 300 Kelvin. They then used different sized containers of the gas to limit and expand the volume. At each different volume, they measure the pressure of the gas on its container. The table they made from their results is seen in table 1.

Temperature in KelvinPressure Measured in Pascals
200 Kelvin16, 628 Pascals
400 Kelvin33, 256 Pascals
600 Kelvin49, 884 Pascals
800 Kelvin66, 512 Pascals

TABLE 1

Img020

FIGURE 1

The graph the students made based on the data is seen in Figure 1.

Pressure is created by the movement of the gas molecules pushing against a container. 0 Kelvin is known as absolute 0, the temperature at which all molecule movement theoretically stops.

If the equation for converting Kelvin to degrees Fahrenheit is:

at what temperature Fahrenheit is the pressure

Answer

When the given number of Pascals is put into the Ideal Gas Law and solved for , the temperature given is 400 Kelvin. When 400 Kelvin is put in the conversion equation, the degrees farenheit given is 260.6 degrees.

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Question

The Ideal Gas Law is as follows:

is pressure as measured in Pascals, is volume as measured in cubic meters, is the number of moles of the gas, is the gas constant known as 8.314 Joules per mole times Kelvin, and is the temperature measured in Kelvin.

A class of students began studying the Ideal Gas Law and how the Pressure and the Volume relate to one another. They took 20 moles of a sample gas and kept the room at a temperature of 300 Kelvin. They then used different sized containers of the gas to limit and expand the volume. At each different volume, they measure the pressure of the gas on its container. The table they made from their results is seen in table 1.

Temperature in KelvinPressure Measured in Pascals
200 Kelvin16, 628 Pascals
400 Kelvin33, 256 Pascals
600 Kelvin49, 884 Pascals
800 Kelvin66, 512 Pascals

TABLE 1

Img020

FIGURE 1

The graph the students made based on the data is seen in Figure 1.

Pressure is created by the movement of the gas molecules pushing against a container. 0 Kelvin is known as absolute 0, the temperature at which all molecule movement theoretically stops.

If the equation that converts temperature Kelvin to temperature in degrees Fahrenheit is

what is the pressure of the sample gas at the freezing point of water, which is 32 degrees Fahrenheit?

Answer

To find the temperature Kelvin to which 32 degrees Fahrenheit correlates, the equation would look like this and one must solve for :

. Then, this temperature must be put into the Ideal Gas Law and solved for pressure:

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Question

The rate of a reversible chemical reaction depends on many factors, including concentrations of the reactants and products, temperature, and presence of enzymes called catalysts. In the forward reaction, two reactants combine to form one product. However, in a reverse reaction, the product is broken down into the two reactants.

In order for a forward reaction to occur, the reactants moving around in the test tube must physically interact with each other. The more often reactants interact with each other, the more produce is formed in the same amount of time. The speed at which reactants combine into products (the rate of the reaction) can be calculated by dividing the amount of a chemical produced in a reaction (often measured in moles) by the time it takes to produce that amount.

In order to determine the effects of reactant and product concentration, temperature, and presence of catalysts on the rate of a reaction, a scientist studied the following reaction:

The scientist varied the conditions of the experiment and measured the rate of the reaction. The results are outlined in Table 1. The units of concentration are moles per liter.

Table_1

In order to display the relationship between the number of moles of H+ and the rate of the reaction in Experiments 1 and 4, the scientist could:

Answer

The question asks us to determine the best way to show the relationship between the moles of a certain reactant, H+, and the rate of the reaction. The most logical way would be to plot the moles versus the rate, providing a line or bar graph that would show how the rate increased with increasing concentration of the reactant. The other plot set ups do not provide a clear way to show how increasing or decreasing the concentration of a reactant would change the rate.

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Question

The rate of a reversible chemical reaction depends on many factors, including concentrations of the reactants and products, temperature, and presence of enzymes called catalysts. In the forward reaction, two reactants combine to form one product. However, in a reverse reaction, the product is broken down into the two reactants.

In order for a forward reaction to occur, the reactants moving around in the test tube must physically interact with each other. The more often reactants interact with each other, the more produce is formed in the same amount of time. The speed at which reactants combine into products (the rate of the reaction) can be calculated by dividing the amount of a chemical produced in a reaction (often measured in moles) by the time it takes to produce that amount.

In order to determine the effects of reactant and product concentration, temperature, and presence of catalysts on the rate of a reaction, a scientist studied the following reaction:

The scientist varied the conditions of the experiment and measured the rate of the reaction. The results are outlined in Table 1. The units of concentration are moles per liter.

Table_1

The effect of temperature on the rate of reaction is best demonstrated by comparing which two trials?

Answer

In Table 1, Trials 1 and 8 have the same number of moles of H+, Cl-, and HCl. Additionally, neither trial contains acid convertase. However, in Trial 8, we can see that the temperature was doubled from that of Trial 1. Thus, Trials 1 and 8 show the relationahip between temperature and reaction rate most clearly.

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Question

The rate of a reversible chemical reaction depends on many factors, including concentrations of the reactants and products, temperature, and presence of enzymes called catalysts. In the forward reaction, two reactants combine to form one product. However, in a reverse reaction, the product is broken down into the two reactants.

In order for a forward reaction to occur, the reactants moving around in the test tube must physically interact with each other. The more often reactants interact with each other, the more produce is formed in the same amount of time. The speed at which reactants combine into products (the rate of the reaction) can be calculated by dividing the amount of a chemical produced in a reaction (often measured in moles) by the time it takes to produce that amount.

In order to determine the effects of reactant and product concentration, temperature, and presence of catalysts on the rate of a reaction, a scientist studied the following reaction:

The scientist varied the conditions of the experiment and measured the rate of the reaction. The results are outlined in Table 1. The units of concentration are moles per liter.

Table_1

If a scientist desired to produce the most HCl possible in a reaction, the scientist could:

Answer

Using Table 1 as a guide, we can see that the rate of the reaction increases when H+ and Cl- are individually doubled over Trial 1. Thus, it is reasonable to conclude that simultaneously increasing the moles of each of these would further increase the rate. The remaining options all have effects opposite that of maximizing the rate of reaction.

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Question

The rate of a reversible chemical reaction depends on many factors, including concentrations of the reactants and products, temperature, and presence of enzymes called catalysts. In the forward reaction, two reactants combine to form one product. However, in a reverse reaction, the product is broken down into the two reactants.

In order for a forward reaction to occur, the reactants moving around in the test tube must physically interact with each other. The more often reactants interact with each other, the more produce is formed in the same amount of time. The speed at which reactants combine into products (the rate of the reaction) can be calculated by dividing the amount of a chemical produced in a reaction (often measured in moles) by the time it takes to produce that amount.

In order to determine the effects of reactant and product concentration, temperature, and presence of catalysts on the rate of a reaction, a scientist studied the following reaction:

The scientist varied the conditions of the experiment and measured the rate of the reaction. The results are outlined in Table 1. The units of concentration are moles per liter.

Table_1

The direction of the reaction most likely depends on:

Answer

The passage and Table 1 only describe the rate of formation of HCl, not whether the reaction primarily forms HCl or whether HCl is broken down into H+ and Cl-. Unless the passage described in more detail how HCl was formed, we cannot assume that the direction of the reaction is solely dependent on one of the factors listed in the table. While we can see that the rate of the reaction slows down when more HCl is initially present at the start of the reaction, we do not know if the reaction rate becomes negative at some point (meaning that more HCl is being broken down than formed).

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Question

The rate of a reversible chemical reaction depends on many factors, including concentrations of the reactants and products, temperature, and presence of enzymes called catalysts. In the forward reaction, two reactants combine to form one product. However, in a reverse reaction, the product is broken down into the two reactants.

In order for a forward reaction to occur, the reactants moving around in the test tube must physically interact with each other. The more often reactants interact with each other, the more produce is formed in the same amount of time. The speed at which reactants combine into products (the rate of the reaction) can be calculated by dividing the amount of a chemical produced in a reaction (often measured in moles) by the time it takes to produce that amount.

In order to determine the effects of reactant and product concentration, temperature, and presence of catalysts on the rate of a reaction, a scientist studied the following reaction:

The scientist varied the conditions of the experiment and measured the rate of the reaction. The results are outlined in Table 1. The units of concentration are moles per liter.

Table_1

In Experiment 8, if the moles of H+ were doubled, the expected rate of the reaction would be:

Answer

This question asks us to consider what the effect of doubling the moles of H+ would be on the rate of the reaction. However, we must take into consideration that Experiment 8 has a doubled temperature, making the base rate 100. If we consider Experiments 1 and 4, we can see that doubling the H+ concentration doubles the rate. Thus, we could predict that the rate would be somewhere around 200. The only option that fits the predicted value is a rate > 100.

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Question

Chemists can model how solids, liquids, and gases behave at different temperatures and pressures with a graph called a phase diagram. When the pressure and temperature are simultaneously known, a scientist can predict whether the material will be in a specific state. The diagram is divided into sections depending on the phase and the lines between sections represent phase transitions occurring between two or more separate phases.

In general, solids of neatly stacked molecules exist when temperatures are low and pressures are intermediate. These values decrease the kinetic energy of the molecules enough to allow for attractive forces to begin the stacking process. Liquids, by contrast, are found at intermediate pressures and temperatures. The temperature is high enough to impart enough kinetic energy to prevent solid formation and the pressure is high enough to prevent the liquid from becoming a gas. Finally, a gas forms at low pressures and high temperatures. The high level of kinetic energy prevents molecules from associating with one another.

Materials can undergo processes called phase transitions, meaning they can transition from one phase to another. The transition from a solid to a liquid is called melting, while the reverse transition is called freezing. Vaporization occurs when a liquid becomes a gas, while condensation occurs when a gas becomes a liquid. Finally, in a process called sublimation, a solid can directly become a gas without passing through a liquid phase. Additionally, when a gas directly becomes a solid, this is known as deposition.

Act_ps

The process as a substance goes from its phase in area one to its new phase in area two is called __________.

Answer

Paragraphs two and three in the passage help us answer this question. Using the information contained in paragraph two, we are able to determine that area one corresponds to the solid phase (low temperature and intermediate pressure) and area two corresponds to the liquid phase (intermediate pressures and temperatures). Thus, we are transitioning between the solid and liquid phases. According to paragraph three, this process is called melting.

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Question

Chemists can model how solids, liquids, and gases behave at different temperatures and pressures with a graph called a phase diagram. When the pressure and temperature are simultaneously known, a scientist can predict whether the material will be in a specific state. The diagram is divided into sections depending on the phase and the lines between sections represent phase transitions occurring between two or more separate phases.

In general, solids of neatly stacked molecules exist when temperatures are low and pressures are intermediate. These values decrease the kinetic energy of the molecules enough to allow for attractive forces to begin the stacking process. Liquids, by contrast, are found at intermediate pressures and temperatures. The temperature is high enough to impart enough kinetic energy to prevent solid formation and the pressure is high enough to prevent the liquid from becoming a gas. Finally, a gas forms at low pressures and high temperatures. The high level of kinetic energy prevents molecules from associating with one another.

Materials can undergo processes called phase transitions, meaning they can transition from one phase to another. The transition from a solid to a liquid is called melting, while the reverse transition is called freezing. Vaporization occurs when a liquid becomes a gas, while condensation occurs when a gas becomes a liquid. Finally, in a process called sublimation, a solid can directly become a gas without passing through a liquid phase. Additionally, when a gas directly becomes a solid, this is known as deposition.

Act_ps

Which phase transition occurs as a material transitions from area two to area three in the figure?

Answer

Using paragraph two, we can determine that area two corresponds to a liquid (intermediate temperatures and pressures) and area three corresoonds to a gas (high temperature and low pressure). According to paragraph three, this process is called vaporization.

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Question

Chemists can model how solids, liquids, and gases behave at different temperatures and pressures with a graph called a phase diagram. When the pressure and temperature are simultaneously known, a scientist can predict whether the material will be in a specific state. The diagram is divided into sections depending on the phase and the lines between sections represent phase transitions occurring between two or more separate phases.

In general, solids of neatly stacked molecules exist when temperatures are low and pressures are intermediate. These values decrease the kinetic energy of the molecules enough to allow for attractive forces to begin the stacking process. Liquids, by contrast, are found at intermediate pressures and temperatures. The temperature is high enough to impart enough kinetic energy to prevent solid formation and the pressure is high enough to prevent the liquid from becoming a gas. Finally, a gas forms at low pressures and high temperatures. The high level of kinetic energy prevents molecules from associating with one another.

Materials can undergo processes called phase transitions, meaning they can transition from one phase to another. The transition from a solid to a liquid is called melting, while the reverse transition is called freezing. Vaporization occurs when a liquid becomes a gas, while condensation occurs when a gas becomes a liquid. Finally, in a process called sublimation, a solid can directly become a gas without passing through a liquid phase. Additionally, when a gas directly becomes a solid, this is known as deposition.

Act_ps

The phase transition occuring at Point C where a substance moves from area one to area three is called __________.

Answer

Paragraph three helps us understand that sublimation occurs when a substance transitions from the solid phase directly to the gaseous phase. Using the information also provided in paragraph two, we can see that area one is where the substance is in solid form (low temperature with intermediate pressure) and area three is where the substance is in gaseous form (high temperature and low pressure).

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Question

Chemists can model how solids, liquids, and gases behave at different temperatures and pressures with a graph called a phase diagram. When the pressure and temperature are simultaneously known, a scientist can predict whether the material will be in a specific state. The diagram is divided into sections depending on the phase and the lines between sections represent phase transitions occurring between two or more separate phases.

In general, solids of neatly stacked molecules exist when temperatures are low and pressures are intermediate. These values decrease the kinetic energy of the molecules enough to allow for attractive forces to begin the stacking process. Liquids, by contrast, are found at intermediate pressures and temperatures. The temperature is high enough to impart enough kinetic energy to prevent solid formation and the pressure is high enough to prevent the liquid from becoming a gas. Finally, a gas forms at low pressures and high temperatures. The high level of kinetic energy prevents molecules from associating with one another.

Materials can undergo processes called phase transitions, meaning they can transition from one phase to another. The transition from a solid to a liquid is called melting, while the reverse transition is called freezing. Vaporization occurs when a liquid becomes a gas, while condensation occurs when a gas becomes a liquid. Finally, in a process called sublimation, a solid can directly become a gas without passing through a liquid phase. Additionally, when a gas directly becomes a solid, this is known as deposition.

Act_ps

The phase transition occuring at Point A where a substance goes from its phase in area two to its phase in area one is best described as __________.

Answer

Paragraph three helps us understand that as a material transitions from a liquid to a solid, it is freezing. We can determine that area two is the liquid phase by noting that it is at intermediate pressure and temperature. Additionally, we can determine that area one is a solid by noting the low temperature and intermediate pressure.

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Question

Chemists can model how solids, liquids, and gases behave at different temperatures and pressures with a graph called a phase diagram. When the pressure and temperature are simultaneously known, a scientist can predict whether the material will be in a specific state. The diagram is divided into sections depending on the phase and the lines between sections represent phase transitions occurring between two or more separate phases.

In general, solids of neatly stacked molecules exist when temperatures are low and pressures are intermediate. These values decrease the kinetic energy of the molecules enough to allow for attractive forces to begin the stacking process. Liquids, by contrast, are found at intermediate pressures and temperatures. The temperature is high enough to impart enough kinetic energy to prevent solid formation and the pressure is high enough to prevent the liquid from becoming a gas. Finally, a gas forms at low pressures and high temperatures. The high level of kinetic energy prevents molecules from associating with one another.

Materials can undergo processes called phase transitions, meaning they can transition from one phase to another. The transition from a solid to a liquid is called melting, while the reverse transition is called freezing. Vaporization occurs when a liquid becomes a gas, while condensation occurs when a gas becomes a liquid. Finally, in a process called sublimation, a solid can directly become a gas without passing through a liquid phase. Additionally, when a gas directly becomes a solid, this is known as deposition.

Act_ps

At point B, a material is transitioning from its phase in area three to its phase in area two. What is this phase transition called?

Answer

From paragraph two, we can see that area three is in the gas phase (high temperature and low pressure) and area two is in the liquid phase (intermediate temperatures and pressures). Thus, we are transitioning from gas to liquid. Paragraph three defines this as condensation.

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Question

Chemists can model how solids, liquids, and gases behave at different temperatures and pressures with a graph called a phase diagram. When the pressure and temperature are simultaneously known, a scientist can predict whether the material will be in a specific state. The diagram is divided into sections depending on the phase and the lines between sections represent phase transitions occurring between two or more separate phases.

In general, solids of neatly stacked molecules exist when temperatures are low and pressures are intermediate. These values decrease the kinetic energy of the molecules enough to allow for attractive forces to begin the stacking process. Liquids, by contrast, are found at intermediate pressures and temperatures. The temperature is high enough to impart enough kinetic energy to prevent solid formation and the pressure is high enough to prevent the liquid from becoming a gas. Finally, a gas forms at low pressures and high temperatures. The high level of kinetic energy prevents molecules from associating with one another.

Materials can undergo processes called phase transitions, meaning they can transition from one phase to another. The transition from a solid to a liquid is called melting, while the reverse transition is called freezing. Vaporization occurs when a liquid becomes a gas, while condensation occurs when a gas becomes a liquid. Finally, in a process called sublimation, a solid can directly become a gas without passing through a liquid phase. Additionally, when a gas directly becomes a solid, this is known as deposition.

Act_ps

At Point D, the material is most likley in what phase(s)?

Answer

The last sentence of the first paragraph gives us an indication of what Point D may represent. We are told that the lines between sections represents a phase transition occuring between those respective phases. At Point D, however, we see that all three phases intersect, implying that all phase transitions are occuring simulaneously at this point and thus all states of the material may be present.

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Question

Chemists can model how solids, liquids, and gases behave at different temperatures and pressures with a graph called a phase diagram. When the pressure and temperature are simultaneously known, a scientist can predict whether the material will be in a specific state. The diagram is divided into sections depending on the phase and the lines between sections represent phase transitions occurring between two or more separate phases.

In general, solids of neatly stacked molecules exist when temperatures are low and pressures are intermediate. These values decrease the kinetic energy of the molecules enough to allow for attractive forces to begin the stacking process. Liquids, by contrast, are found at intermediate pressures and temperatures. The temperature is high enough to impart enough kinetic energy to prevent solid formation and the pressure is high enough to prevent the liquid from becoming a gas. Finally, a gas forms at low pressures and high temperatures. The high level of kinetic energy prevents molecules from associating with one another.

Materials can undergo processes called phase transitions, meaning they can transition from one phase to another. The transition from a solid to a liquid is called melting, while the reverse transition is called freezing. Vaporization occurs when a liquid becomes a gas, while condensation occurs when a gas becomes a liquid. Finally, in a process called sublimation, a solid can directly become a gas without passing through a liquid phase. Additionally, when a gas directly becomes a solid, this is known as deposition.

Act_ps

Solid carbon dioxide is commonly stored in freezing cold, low pressure rooms to prevent loss of the material. If the temperature in the room slowly warmed, the solid carbon dioxide would most likely become what?

Answer

This question asks us to look at the figure to see what would happen if we keep the pressure constant but increase the temperature of the room storing the dry ice. We can see that as we move left to right across the figure, without changing pressure, that we cross the phase transition line for sublimation/deposition. Becasue the temperature is warming, we know we are going from a solid directly to a gas by the process of sublimation.

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