Which of these terms is a measurement of how much matter is in an object?

A scientist adds a few teaspoons of sugar to a cup of warm water and begins to stir. Eventually the sugar dissolves into the water. Which of the following graphs best represents the amount of matter in the sugar before and after the scientist began stirring?

Will the mass change when reactants combine to form products in a chemical reaction? Why?

Lamonte is doing a science experiment. They have a jar full of 10 grams of sugar. They add 5 grams of a mystery chemical. When the two are mixed, they create a new solid and no gases. The container is very hot. How many grams of the new substance should be in the jar at the end of the experiment?

In which of these situations does the some of the matter disappear, instead of changing forms?

The number of water molecules in a small amount of water is a very big number! There are about 1.5 sextillion molecules in a single drop! If you boiled one drop of water until it was completely in gas form, how many molecules would be in the water vapor?

The following is a procedure for a scientific experiment:

Material List:

1. a balloon
2. a narrow necked soda bottle
3. a pan of hot water
4. a pan of ice water
5. a scale

Procedure:

1. Take the balloon and stretch it gently over the lip of the soda bottle and place it on the scale.

2. Place the bottle into the pan of hot water and let it stand for a few minutes.

3. To reverse the outcome, place the bottle into the pan of ice water and let it stand for a few minutes.

Results:

The balloon inflates when it is warm and deflates when it is cold.

If the bottle starts deflated, is warmed up, then cooled down which of these correctly graphs the mass of the bottle and the matter inside it?

Meredith's class watched the teacher perform a demonstration in class today. She claimed that she could provide evidence that matter is conserved. She found the mass of a few ice cubes and a cup of water filled about 2/3 of the way. She let the ice cubes melt and then found the mass again. The data table below shows her results.

What evidence from the data table above supports the teacher's claim that matter is conserved?

Kaitlyn's class watched the teacher perform a demonstration in class today. She claimed that she could provide evidence that matter is conserved. She found the mass of sugar and a cup of water filled about 2/3 of the way. She let the sugar dissolve in the water and then found the mass again. The data table below shows her results.

The mass of the dissolved sugar and water is missing. Following the Law of Conservation of Matter, what should the mass of the two substances be?

Danielle's class was investigating the Law of Conservation of Matter in science today. They found the mass of a piece of construction paper and then ripped it in half, into quarters, and then eighths. They found the mass at each stage and recorded it on the graph below.

True or False: The mass of the paper was conserved throughout the investigation.