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Chem 30 Review

Total questions: 77

Worksheet time: 8hrs 37mins

Name
Class
Date
1.
In an exothermic process the surrounding looses heat. 
a)
True
b)
False
2.
In an endothermic reaction the system is releasing energy.
a)
True
b)
False
3.
Do the reactants in an exothermic reaction have a higher or lower energy than the products?
a)
Higher
b)
Lower
4.
Do reactants in an endothermic reaction have a higher or lower energy than the products? 
a)
Higher
b)
Lower
5.
H2 + 2 C + N2 + 270.3 kJ --> 2 HCN
Is this reaction endothermic or exothermic?
a)
Endothermic 
b)
Exothermic
6.
H2 + Cl2 --> 2 HCl + 1845 kJ
Is this reaction endothermic or exothermic?
a)
Endothermic 
b)
Exothermic
7.

An oxidizing agent will

a)

be oxidized

b)

lose electrons

c)

be reduced

d)

increase in oxidation number

8.

In a redox reaction, the species that loses electrons

a)

is called the cathode

b)

is oxidized

c)

gains mass at the electrode

d)

decreases in oxidation number

9.

Oxidation-reduction reactions occur because of the competition between particles for

a)

electrons

b)

positrons

c)

protons

d)

neutrons

10.

The reaction 2NaCl → 2Na + Cl2 is an example of

a)

a reduction reaction, only

b)

both an oxidation and reduction reaction

c)

an oxidation reaction, only

d)

a disproportionation reaction

11.

Pb + 2Ag+ → Pb2+ + 2Ag


The chemical species being reduced is

a)

Ag

b)

Pb

c)

Pb2+

d)

Ag+

12.

Galvanic cells convert

a)

mechanical energy in to electrical energy

b)

potential energy in to electrical energy

c)

electrical energy in to chemical energy

d)

chemical energy in to electrical energy

13.

In electrolysis, particles which move towards cathode are called

a)

anions

b)

cations

c)

photons

d)

positrons

14.

Acids have a ______ pH and a _________ pOH

a)

low, high

b)

high, low

c)

An acid will not have a pOH

15.
What is the conjugate acid in the following equation?
a)
PO43- 
b)
HNO3 
c)
NO3- 
d)
HPO42-
16.
What is the conjugate base in the following reaction?
a)
HCO3- 
b)
HCl
c)
 H2CO3 
d)

Cl-

17.

Which of the following correctly identifies an Acid-Base Pair?

a)

HH4+ , OH-

b)

H2O , OH-

c)

CaCO3 ,CaCl2

d)

HNO3 , H2SO4

18.

Given the reaction above, which compound is the Bronsted-Lowry conjugate acid?

a)

NH3

b)

NH4+

c)

Cl-

19.

A substance that is produced when a base has accepted an H+ ion is

a)
An acid
b)
A Base
c)
A Conjugate Acid
d)
A Conjugate Base
20.

The conjugate acid of HCO3- is ___ and the conjugate base of HCO3- is ___.

a)
H2CO3; CO3-2
b)
CO3-2; CO3-2
c)
H2CO3; H2O
d)
H2O; H2CO3
21.

Which reactant in the following equation is a Bronsted-Lowry acid?

a)
ammonium
b)
ammonia
c)
hydroxide
d)
water
22.

According to Bronsted-Lowry, what is the definition of an BASE?

a)

a substance that donates a hydrogen (H+) ion

b)

a substance that donates a hydroxide (OH-) ion

c)

a substance that accepts a hydrogen (H+) ion

d)

a substance that accepts a hydroxide (OH-) ion

23.

Which of the following is a strong acid?

a)

oxalic acid

b)

nitric acid

c)

carbonic acid

d)

acetic acid

24.

NaOH is:

a)

an Arrhenius base

b)

an Arrhenius acid

c)

neither an acid nor a base

d)

both an acid and a base

25.

Which of the following pairs consist of a weak acid and a strong base?

a)

sulfuric acid, sodium hydroxide

b)

acetic acid, ammonia

c)

acetic acid, sodium hydroxide

d)

nitric acid, ammonia

26.

Which compound can act as both an acid and a base?

a)

water

b)

ammonia

c)

sodium hydroxide

d)

hydrochloric acid

27.

In the reaction:

HCO31– + H2O ↔ CO32– + H3O+

the carbonate ion is acting as a ___.

a)

acid

b)

base

c)

indicator

d)

conjugate

28.

Identify the acids involved in the equilibrium reaction:

CN– + H2O ↔ HCN + OH–

a)

CN– and H2O

b)

H2O and HCN

c)

CN– and OH–

d)

H2O and OH–

29.

What is transferred between a conjugate acid-base pairs?

a)

an electron

b)

a proton

c)

a hydroxide ion

d)

a hydronium ion

30.

All of the following are conjugate acid-base pairs except:

a)

O2– : OH1–

b)

H2CO3 : HCO31–

c)

HSO41– : SO42–

d)

HNO3 : NO21–

31.

What is Kw K_{w\ } ?

a)

Is the dissociation constant of weak acid reaction.

b)

Is the dissociation constant of weak base reaction. 

c)

Is the dissociation constant of the Auto Ionization of water. 

d)

Is the dissociation constant of any equilibrium reaction. 

32.

What are the products of the following rxn: HNO2 + Br- --> ?

a)

H2NO2

b)

NO2-

c)

HBr

d)

BrNO2

33.

What are the products of the following rxn: HS- + OH- --> ?

a)

S2-

b)

S-

c)

H20

d)

H2S

34.

When CH3COOH is reacted with NO2-, which of the reactants or products is favoured?

a)

reactants

b)

products

c)

they are equally favoured

d)

there is no way to tell

35.

Which is the stronger acid?

a)

H2C6H606

b)

HCO3-

36.

Which is the stronger acid?

a)

H2CO3

b)

H2S

c)

HCOOH

37.

Which is the stronger base?

a)

HPO42-

b)

C3H7COO-

c)

CO32-

d)

OCl-

38.

Which is the weaker acid?

a)

HCN

b)

H2CO3

c)

NH4+

d)

HF

39.

Which is the weaker base?

a)

HS-

b)

HCOO-

c)

SO32-

d)

F-

40.

Oxidation is the ____ of electrons and reduction is the ____ of electrons.

a)

loss

gain

b)

gain

loss

c)

creation

explosion

d)

explosion

creation

41.

What is the oxidation number of S in H2SO4H_2SO_4  ?

a)

-5

b)

+5

c)

-6

d)

+6

42.

What is the oxidation number of P in H3P3O10H_3P_3O_{10}  ?

a)

+5

b)

+4

c)

+6

d)

-5

43.

When an element is reduced, it's oxidation number

a)

increases

b)

decreases

c)

stays the same

44.

Ag2S + HNO3 → Ag2SO4 +NO2 +H2OAg_2S\ +\ HNO_3\ \rightarrow\ Ag_2SO_4\ +NO_2\ +H_2O  

Which atom is oxidized?

a)

S

b)

N

c)

O

d)

H

45.

oxidation or reduction?

Fe2+ + 2e− → FeFe^{2+}\ +\ 2e^-\ \rightarrow\ Fe  

a)

oxidation

b)

reduction

46.

What is the next step to balancing this equation?

AuCl3 → Au + HClAuCl_3\ \rightarrow\ Au\ +\ HCl  

a)

Add 1H+ to the left

b)

Add 3 H2O to left

c)

Put 3 in front of HCl

d)

Add 1 H2O to right

47.

Which atom is the oxidizing agent?

Ag2S + HNO3 → Ag2SO4 + H2OAg_2S\ +\ HNO_3\ \rightarrow\ Ag_2SO_4\ +\ H_2O  

a)

S

b)

Ag2SAg_2S  

c)

N

d)

HNO3HNO_3  

48.

In the following reaction, where do the electrons go?

MnO4 −+ 5 Fe2+ + 8 H+ → Mn2+ + 5 Fe3+ + 4 H2OMnO_4^{\ -}+\ 5\ Fe^{2+}\ +\ 8\ H^+\ \rightarrow\ Mn^{2+}\ +\ 5\ Fe^{3+}\ +\ 4\ H_2O  

a)

Fe3+ to Fe2+

b)

MnO4- to Fe2+

c)

Fe2+ to MnO4-

d)

MnO4- to Mn2+

49.

In a voltaic/galvanic cell, the cathode is the site of

a)

reduction

b)

oxidation

c)

redox

50.

electrons flow from the

a)

cathode to anode

b)

anode to cathode

c)

away from the electrolyte

d)

toward the salt bridge

51.

A spontaneous redox reaction will have a negative value for the standard cell potential.

a)

true

b)

false

52.

Which beaker colour is the anode?

a)

red

b)

green

53.

Which electrode gains mass?

a)

anion

b)

cation

c)

anode

d)

cathode

54.

This is an unbalanced redox reaction for a galvanic cell. Spontaneous or not? Ecell?

a)

spontaneous

1.05 V

b)

spontaneous

1.33 V

c)

non-spontaneous

-1.05 V

d)

non-spontaneous

-1.33 V

55.

A metal that will react spontaneously with Cr3+(aq) in a chromium plating solution is

a)

aluminum

b)

cadmium

c)

lead

d)

tin

56.

If a neutral atom becomes positively charged, then it has

a)

been reduced

b)

been oxidized

c)

lost a proton

d)

gained a neutron

57.

Which of the following combinations make up a voltaic cell?

a)

Cl-(aq) and H2(g)

b)

Cr3+(aq) and Pb(s)

c)

Fe2+(aq) and Cu

d)

I2(s) and Ca(s)

58.

What reaction occurs at the anode of a voltaic cell?

a)

oxidation of solid metals

b)

oxidation of cations

c)

reduction of solid metals

d)

reduction of cations

59.

What is the function of a salt bridge or porous cup in a voltaic cell?

a)

allows electrons to flow from the anode

b)

allows cations to flow from the cathode

c)

allows anions to flow to the cathode

d)

allows cations to flow to the cathode

60.

A good choice of metal for a sacrificial anode for iron would be

a)

aluminium

b)

copper

c)

silver

d)

gold

61.

Identify the statement that distinguishes voltaic cells from electrolytic cells.

a)

Electrolytic cells require an electrolyte.

b)

Voltaic cells require a cathode and an anode.

c)

Electrolytic cells require an external power source.

d)

Voltaic cells have electron-flow from the anode to cathode.

62.

How many electrons are transferred in this equation?

Al(s) + Cl2(g) →AlCl3Al\left(s\right)\ +\ Cl_2\left(g\right)\ \rightarrow AlCl_3  

a)

0

b)

1

c)

2

d)

3

63.

What mass of copper is deposited at the cathode if the cell operates at 11.5 A of current for 37.2 min?

a)

8.45 g

b)

169 g

c)

16.9 g

d)

84.5 g

64.

How long would it take to electroplate a flute with 28.3 g of silver at a constant current of 2.0 A using AgNO3?

a)

3.6 hrs

b)

3.5 hrs

c)

25317 hrs

d)

12600 hrs

65.

In a functioning voltaic cell, the anions migrate

a)

towards the anode through the wire

b)

towards the cathode through the wire

c)

towards the cathode through the salt bridge

d)

towards the anode through the salt bridge

66.

Which ion could NOT undergo disproportionation?

a)

Au+

b)

Ni2+

c)

Cu2+

d)

Pt2+

67.
The product of reacting propene with hydrochloric acid is:
a)
2-chloropropane
b)
2-chloropropene
c)
2-chloropropyne
d)
chloropropane
68.

What type of reaction is shown?

a)
addition
b)
combustion
c)
double replacement
d)
substitution
69.

What type of reaction is shown?

a)
fermentation
b)

combustion

c)

esterification

d)
substitution
70.

What type of reaction is shown?

a)
addition
b)
polymerization
c)
esterification
d)

substitution

71.

What type of reaction is shown?

a)

addition

b)
polymerization
c)
esterification
d)

substitution

72.

What type of reaction is shown?

a)
substitution
b)
addition
c)
polymerization
d)

esterification

73.

The molecular formula for heptane is

a)
C4H10
b)
C8H18
c)
C5H12
d)
C7H16
74.
The "ane" ending in "alkane" tells someone that they are dealing with _________-bonded carbons.
a)
single
b)
double
c)
triple
d)
quadruple
75.
What is the general formula of an alkene
a)
2n+2
b)

CnH2n+2

c)

CnH2n

d)

CnHn

76.
What is the general formula of an alkane
a)
2n+2
b)

CnH2n+2

c)

CnH2n

d)

CnHn

77.
The longer the hydrocarbon, the _______ the boiling point
a)
Lower
b)
Higher

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