8.1 8.2 Chemical Equations

Question 1

What is a chemical reaction?

Answer 1

A change in which a substance or substances is changed into one or more new substances

Question 2

How does temperature indicate the occurrence of a chemical reaction?

Answer 2

Reaction system cooler (absorbing energy/endothermic)

Reaction system warmer (producing energy/exothermic)

Question 3

Visual evidence of chemical reactions

Answer 3

Bubbles/fizz

Change in color

Question 4

Precipitate

Answer 4

Indicator of a chemical reaction
A solid product formed from two solutions reacting
Might cause reaction system to appear cloudy until filtered and allowed to dry

Question 5

——>

Answer 5

Yields or produces

Question 6

+

Answer 6

Reacts with or And

Question 7

——–>

Answer 7

Reversible equation or equilibrium

Question 8

(s)

Answer 8

Solid state

Question 9

(l)

Answer 9

Liquid state

Question 10

(g)

Answer 10

Gaseous state

Question 11

(aq)

Answer 11

Aqueous state (dissolved in water)

Question 12

triangle

——>

Answer 12

Delta above reaction indicates that heat is added

Question 13

Pd/Pt

——>

Answer 13

A substance named above arrow represents a catalyst