Chemical Equations and Reactions Basics

A process that involves the physical or chemical change of a substance is ____________________.

• compound

• chemical reaction

• molecular formula

• formula unit

Which of the following is not a chemical reaction?

• a copper sculpture turning green over time

• metal rusting

• frying an egg

• all of these are chemical reactions

Which of the following is not a chemical reaction?

• burning a substance

• baking bread

• a banana ripening

• all of these are chemical reactions

Which of the following is not a chemical reaction?

• the use of oxygen by your body

• helium lifting a balloon into the air

• digestion of your food

• learning in your brain

Substances that are changed in a chemical reaction are the _______________.

• products

• reactants

• ingredients

• energy

The product of a chemical reaction is _____________.

• the substance made in the chemical reaction

• the energy released by the chemical reaction

• both of these describe the product

In a chemical reaction ______________ are changed into ______________.

• reactants, products

• products, reactants

• chemicals, substances

• substances, chemicals

Chemical reactions will occur because _______________________.

• atoms without a complete set of valence electrons will bond to fill their outer orbitals

• atoms are seeking to feel more stable

• both of these

Some reactions require energy to be added for the reaction to move forward.

• True

• False

Some chemical reactions release energy as they move forward.

• True

• False