HC Fall Final Review (2-11+22)

Front

What type of change is represented by chewing food?

Back

Physical Change

Front

What type of change is represented by the conversion of starch into sugars by enzymes?

Back

Chemical Change

Front

What is the total number of valence electrons in atoms of group 14?

Back

4

Front

What atom has the electron configuration 1s² 2s² 2p⁶ 3s²?

Back

Magnesium

Front

What type of reaction is represented by the equation CaCO₃ → CaO + CO₂?

Back

Decomposition

Front

What is a physical change?

Back

A change that affects one or more physical properties of a substance without altering its chemical composition.

Front

What is a chemical change?

Back

A change that results in the formation of new chemical substances.

Front

Give an example of a physical change.

Back

Melting ice.

Front

Give an example of a chemical change.

Back

Burning wood.

Front

What is the difference between a physical change and a chemical change?

Back

Physical changes do not change the substance's chemical identity, while chemical changes do.