Chemical Reactions Review

During a chemical reaction, what happens to the ATOMS of each element or compound?

• they appear

• get rearranged

• disappear

• stop moving/vibrating

Identify the PRODUCTS in the following chemical reaction:

Chromium Oxide + Carbon --> Chromium + Carbon Monoxide

• chromium and carbon

• chromium and carbon dioxide

• chromium and carbon monoxide

• chromium oxide and carbon

• 4

• 3

• 2

• 1

In chemical reactions, a product is______

• any substance that is made of the greatest number of atoms

• any substance that is to the left of the arrow

• any substance that is made from the least number of atoms

• any substance to the right of the arrow

The Law of Conservation of Mass states

• that matter exists in all states and reacts the same
• that matter can only be changed into new substances by introducing a catalyst
• that matter exists in the same state throughout any chemical change
• that matter cannot be created or destroyed and that the mass of the products must equal the mass of the reactants

a copper penny turning greenish after a few years.

• Chemical Change
• Physical Change

Which of the following IS a physical change?

• Getting a haircut
• Rusty metal
• sour milk
• A compound

Which of the following is a sign that a chemical reaction has occurred?

• change in shape
• melting
• formation of a gas
• dissolving

When a chemical reaction occurs, a new __________ is formed.

• Element

• Nucleus

• Substance

• Star

Is solubility ("like dissolves like") a physical or a chemical change?

• Physical change

• Chemical change