Chemical Change

Chemical changes involve

• Formation of a new substance

• change in size

• physical change

• None of the choices

When hydrogen reacts with oxygen

• CO2 is produced

• water is produced

• no reaction occurs

• energy remains the same

The substances produced as a result of a chemical reaction

• Reactants

• Catalyst

• Products

• Coefficients

The substances that are written before the arrow in a chemical equation are

• Reactants

• Inert

• Explosives

• Producats

What is a chemical reaction?

• A physical change in the state of matter

• A process that only involves the rearrangement of atoms

• A process in which substances undergo a change in composition and produce new substances

• A change in color or odor of a substance

Electrolysis of water involves

• splitting water into hydrogen

• splitting water into hydrogen and oxygen

• combustion of hydrogen

• physical change