Chemical Reactions Test

The substances that are formed by a chemical reaction are called the

• products

• reactants

• chemicals

• precipitates

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

A balanced chemical equation will have the same ________ on each side.

• number of atoms of each element

• compounds

• electrons

Tags

NGSS.MS-PS1-5

When the equation Mg + HCl —> MgCl2 + H2 is balanced, the coefficient of MgCl2 is _______.

• 3

• 4

• 2

• 1

Tags

NGSS.MS-PS1-5

The energy necessary to start a chemical reaction is called the __________ energy.

• exothermic

• activation

• endothermic

• combustion

When there is ABSORPTION of energy in a chemical reaction, it is called a(n) __________ reaction.

• exothermic

• activation

• endothermic

• combustion

Tags

NGSS.HS-PS1-4

When energy is RELEASED in a chemical reaction, it is called a(n) __________ reaction.

• exothermic

• activation

• endothermic

• combustion

Tags

NGSS.HS-PS1-4

A substance that increases the rate of a chemical reaction but is not consumed in the reaction is called

• oxidation

• a catalyst

• reduction

• activation

Tags

NGSS.HS-PS1-5

The rate of a chemical reaction would be increased by

• increasing the concentration of the reactants

• increasing the temperature of the reactants

• adding a catalyst

• all of the above

Tags

NGSS.HS-PS1-5

Which type of reaction is ( 2NiO_3 → 4Ni + 3O_2 )?

• Single-replacement

• Double-replacement

• Decomposition

• Synthesis

By definition, the addition of oxygen to a substance is called

• neutralization

• reduction

• oxidation

• displacement