chapter 9

Question 1

Identify the category of the following reaction

4HNO3 —- 4NO2+2H2O+O2

Answer 1

decomposition reaction

Question 2

exothermic

Answer 2

heat is released

Question 3

endothermic

Answer 3

heat is needed

Question 4

What are the three factors necessary for a chemical reaction to occur?

Answer 4

Molecular collisions, low activation energy, and proper orientation of particles

Question 5

major types of chemical reactions

Answer 5

• Combination
  – Decomposition
  – Displacement
  – Exchange
  – Combustion
• Chemical Reaction

Question 6

what is a chemical reaction

Answer 6

Process in which at least one new substance is produced as a result of chemical change.

Question 7

what is a decomposition reaction

Answer 7

Chemical reaction in which a single reactant is converted into two (or more) simpler substances (elements or compounds)

example: XY → X + Y
example: 2CuO → 2Cu + O

Question 8

chemical equilibrium

Answer 8

The state in which forward and reverse chemical reactions occur simultaneously at the same rate

Question 9

reversable chemical reaction

Answer 9

all reactions are reversable.

Question 10

equilibrium =

Answer 10

balance

Question 11

equilibrium constant

Answer 11

A numerical value that characterizes the concentrations of reactants and products in a system at chemical equilibrium

Question 12

Arrhenius acid:

Answer 12

hydrogen containing compound

Question 13

conjugate base

Answer 13

proton donor

Question 14

conjugate acid

Answer 14

proton accepter

Question 15

hydrogen acid:

Answer 15

chloride

Question 16

examples of strong acids

Answer 16

HCI- hydrocloric acid
HBr- hydrobromic acid
NHN3- nitric acid

Question 17

weak acid:

Answer 17

Transfers only a small percent of its protons to water in an aqueous solution

Question 18

Which of the following equations would be a
correct representation of a strong acid when
placed in water?Which of the following equations would be a
correct representation of a strong acid when
placed in water?
a. HA + H2O H3O+ + A–
b. HA + H2O H3O+ + A–
c. HA + H2O H3O+ + A–
d. Not enough information is provided.

Answer 18

B

Question 19

sodium hydroxide=

Answer 19

strong base

Question 20

How do we Quantify the Strength of an Acid or Base?

Answer 20

An acid ionization constant

Question 21

what is a salt?

Answer 21

a positive ion and a negative ion (except OH-)

Question 22

what is self-ionization?

Answer 22

An extremely small percentage of water
molecules in pure water interact with one another to form ions.

Question 23

how to make a salt?

Answer 23

completely react an acid with a base