Exam Review: Unit 9 - Chapter 21 - Chemical Formulas

Question 1

What is a chemical equation?

Answer 1

A way to describe a chemical reaction using chemical formulas and symbols

Question 2

______ are on the left side of an equation, and _________ are on the right

Answer 2

Reactants Products

Question 3

A reaction that releases energy is

Answer 3

Endergonic

Question 4

A reaction that absorbs energy is

Answer 4

Exergonic

Question 5

Endothermic reactions ______

Answer 5

Absorb heat

Question 6

Exothermic reactions _____

Answer 6

Release heat

Question 7

________ speed up a reaction

Answer 7

Catalysts

Question 8

________ slow down a reaction

Answer 8

Inhibitors

Question 9

–> means

Answer 9

Reacts/Produces/Forms/Yields

Question 10

+ means

Answer 10

added to or “plus”

Question 11

(s) means

Answer 11

Solid

Question 12

(aq) means

Answer 12

Aqueous

Question 13

heat

–>

means

Answer 13

Reacts with heat

Question 14

light

–>

means

Answer 14

Reacts with light

Question 15

(l) means

Answer 15

Liquid

Question 16

(g) means

Answer 16

Gas

Question 17

Elec.

–>

means

Answer 17

Reacts with electricity

Question 18

In 2Li_(s)

the coefficient is

Answer 18

2

Question 19

In 2Li_(s)

The state is

Answer 19

(s)

Solid

Question 20

Is this statement true?

2Li_(s) + H₂O_(l) –> 2LiOH_(aq) + H_2(g)

Answer 20

No

Question 21

A solid that forms from two liquids or aqueous solutions in a double-displacement reaction is a(n) ________

Answer 21

Precipitate

Question 22

Balance:

_____LiI_(aq) + _____Pb(NO₃)_2(aq) –> _____LiNO_3(aq) + _____PbI_2(s)

What type of reaction is it?

Answer 22

__2__ _____ __2__ _____

Double-Displacement