Chemical Reaction Review

When a new substance is formed with different properties than the original substance it is called a

• chemical change

• physical change

• state change

• phase change

Chemical change occurs as a result of a ____________.

• chemical reaction

• physical change

• phase change

• controlled experiment

Which are the reactants in the equation shown?

• H₂O and CO₂
• O₂ and CH₄

What describes the reactant atoms in the equation shown?

• Al= 4, O= 3
• Al= 1, O= 1
• Al= 4, O= 6
• Al= 6, O= 1

This equation is _________.

• balanced
• not balanced

This equation is _________.

• balanced
• not balanced

Mg + 2HCl --> MgCl₂ + H₂

This equation is _________.

• balanced

• not balanced

Overall, energy is _________ in an exothermic reaction.

• released

• absorbed

Overall, energy is _________ in an endothermic reaction.

• released

• absorbed

What describes the product atoms in the equation shown?

• Al= 4, O= 3

• Al= 1, O= 1

• Al= 4, O= 6

• Al= 6, O= 1