Write the number 42,000,000 in scientific notation using the correct number of significant figures.

A student experimentally determines the specific heat of water to be . He then looks up the accepted value and finds that it is . What was the student's percent error?

The hospital carries 0.9% solution of sodium chloride in purified . The professor asked his student to prepare 500mL of 0.45% percent solution sodium chloride in purified . What volumes of the original solution and purified , respectively, are needed to make the new solution?

Solve and account for significant figures.

Calculate using the correct number of significant figures:

Convert the number into standard notation, with the correct number of significant figures.

The table shows the data obtained by three groups when finding the boiling point of methanol. The accepted value is . Is group A precise, accurate or both?

The table shows the data obtained by three groups when attempting to find the boiling point of methanol. The accepted value is . Is group C precise, accurate, both, or neither?

Find the volume that of carbon dioxide will occupy if it's density is .

How many significant figures does the number 42,000,000 have?

3.2 g Zn and 8.1 g HCl are placed in an open beaker. As the reaction proceeds, the hydrogen gas is allowed to escape, causing the reaction to go to completion.

Which reactant (if either) is in excess, and how many grams of it remain?