Conservation of matter

If a pot of water is boiled until all the liquid water becomes steam, how does the mass of the steam compare to the original mass of the liquid water?

• The steam has less mass because it's less dense.

• The steam has more mass due to added energy.

• The mass of the steam is precisely the same as the mass of the liquid water.

• The mass of the steam cannot be measured.

What does the Law of Conservation of Matter state about physical or chemical processes?

• Matter can be created but not destroyed.

• Matter can be destroyed but not created.

• Matter is neither created nor destroyed.

• Matter can change into energy.

In a balanced chemical equation, what is true about the atoms involved in the reaction?

• Atoms are created on the product side.

• Atoms are destroyed on the reactant side.

• The number and type of atoms remain the same on both sides.

• Atoms can change into different elements.

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Why does a copper pipe gain mass when it rusts after being exposed to the elements?

• The copper atoms themselves become heavier.

• New copper atoms are created from the environment.

• Oxygen atoms from the atmosphere bond with the copper, adding mass.

• Water from the rain is absorbed into the pipe, increasing its mass.