8th final exam

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

• products

• reactants

• chemicals

• precipitates

Tags

NGSS.MS-PS1-2

When the equation Mg + HCl → MgCl2 + H2 is balanced, the coefficient of MgCl2 is

• 3

• 4

• 2

• 1

Tags

NGSS.MS-PS1-5

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

• exothermic

• activation

• endothermic

• combustion

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

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

• exothermic

• activation

• endothermic

• combustion

Tags

NGSS.MS-PS1-4

A substance that speeds up the rate of a chemical reaction by lowering the activation energy

• oxidation

• a catalyst

• reduction

• activation

Tags

NGSS.HS-PS1-4

A solution with a pH of 1 is

• a strong acid

• a strong base

• a weak acid

• a weak base

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

• neutralization

• reduction

• oxidation

• displacement

By definition, when oxygen is removed from a substance it is called

• neutralization

• reduction

• oxidation

• displacement

Tags

NGSS.HS-PS1-7

One reactant of photosynthesis is carbon dioxide + water + light energy → glucose + oxygen

• hydrogen

• oxygen

• carbon dioxide

• methane

Tags

NGSS.MS-LS1-6

What basic type of reaction is illustrated by the general equation AB → A + B?

• synthesis

• decomposition

• single replacement

• double replacement