Understanding the Law of Conservation of Mass

What is considered the basic functional unit in chemistry?

• Molecule

• Atom

• Compound

• Element

According to the Law of Conservation of Mass, what happens to matter during a chemical reaction?

• It is destroyed

• It is created

• It changes forms

• It disappears

In the reaction of methane with oxygen, what are the products formed?

• Carbon monoxide and water

• Carbon dioxide and water

• Methane and oxygen

• Hydrogen and oxygen

If you start with 100 grams of reactants in a chemical reaction, how much mass should you expect in the products?

• Zero grams

• More than 100 grams

• Exactly 100 grams

• Less than 100 grams

What must remain constant in terms of elements during a chemical reaction according to the Law of Conservation of Mass?

• The number of reactions

• The number of molecules

• The number of compounds

• The number of atoms