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final chem review

Total questions: 83

Worksheet time: 4hrs 35mins

Name
Class
Date
1.

What is the name of the feature labelled C?

a)

Half equivalence point

b)

Equivalence point

c)

Buffer region

2.

What is the name of the feature labelled B?

a)

Half equivalence point

b)

Equivalence point

c)

Buffer region

3.

What is the name of the feature labelled A?

a)

Half equivalence point

b)

Equivalence point

c)

Buffer region

4.

Define buffer region

a)

when half the moles of acid or base have been neutralised

b)

when the solution is resisting the change in pH

c)

when all moles of acid have reacted with all moles of base / point of neutralisation

d)

when the indicator changes colour

5.

The following titration shows

a)

A strong acid added to a strong base

b)

A strong base added to a strong acid

c)

A weak acid added to a strong base

d)

A weak base added to a strong acid

6.

The following titration shows

a)

A strong acid added to a strong base

b)

A strong acid added to a weak base

c)

A weak acid added to a strong base

d)

A strong base added to a weak acid

7.

Select an appropriate indicator for this titration

a)

Phenolphthalein

b)

Bromoscresol Green

c)

Bromophenol Blue

d)

Methyl Orange

8.

When a strong acid is being added to a weak base, the equivalence point will be

a)

Below 7

b)

Above 7

c)

At, or close to, 7

9.

When a strong base is being added to a weak acid, the equivalence point will be

a)

Below 7

b)

Above 7

c)

At, or close to, 7

10.

30cm3 of NaOH is neutralised by 12.3cm3 of 0.2mol/l HCl. What is the concentration of the NaOH.

a)

82 mol/l

b)

0.82 mol/l

c)

0.49 mol/l

d)

0.082 mol/l

11.
The reaction of perchloric acid (HClO4) with lithium hydroxide (KOH) is described by the equation
HClO4 + KOH → KClO4 + H2O
Suppose 100 mL of perchloric acid is neutralized by exactly 50,0 mL of 1.0 M of Potassium hydroxide. What is the concentration of the perchloric acid?
a)
0.5M
b)
50M
c)
2.0M
d)
1.0M
12.
For the reaction...
SO2 + O2  <−>  SO3
If the concentration of SO2 is increased, the equilibrium of the reaction will shift ___________.
a)
left
b)
right
c)
left and right 
d)
neither left nor right
13.
Which is the reactant - and why?
a)
A, as concentration decreases
b)
B, as concentration decreases
c)
A, as concentration increases
d)
B, as concentration increases
14.
When the system X + 2 Y <=> Z has reached equilibrium, which of the following is TRUE?
a)
Forward reaction and Backward reaction stop.
b)
Forward reaction has sped up and backward reaction has slowed down.
c)
Forward and backward reactions occur at the same rate.
d)
Forward reaction has slowed down and backward reaction has sped up.
15.
For the reaction...
N2 (g) +  3 H2 (g) <=> 2 NH3 (g)

If the pressure in the system is increased,  which substance(s) will increase in concentration?
a)
N2  (as 2 mol gas  → 4 mol gas)
b)
H2 (as 2 mol gas  → 4 mol gas)
c)
N2 and H2 (as 2 mol gas  → 4 mol gas)
d)
NH3 (as 4 mol gas  → 2 mol gas)
16.
What is the Kc expression for this reaction?
   2 NO(g)  +  O2(g) ⇌  2 NO2(g)
a)
Kc = [NO2]2 / [NO]2 [O2]
b)
Kc =  [NO]2 [O2] / [NO2]2
c)
Kc = [NO]2 [O2] [NO2]2
d)
Kc = [NO2]2 / [NO]2 +  [O2]
17.
Changes in pressure will only affect substances that are in the __________ state.
a)
gaseous
b)
liquid
c)
solid
d)
plasma
18.

2CrO42- + 2H+ → Cr2O72- + H2O


What will happen when H+ ions are added to the system?

a)

Position of equilibrium will shift to left and become more yellow

b)

Color of system will turn all yellow

c)

Color of system will turn all orange

d)

Equilibrium will shift to right and become more orange

19.

According to the Bronsted-Lowry theory, bases are:

a)

Always oxides and hydroxides of metals

b)

Alkalis which are soluble in water

c)

proton donors

d)

proton acceptors

20.

The pH of a solution of 0.001 mol/L NaOH is:

a)

3

b)

11

c)

1 x 10-3

d)

1 x 10-11

21.

A solution of hydrochloric acid is diluted. As a result, its pH changes from 2 to 4. The hydrogen ion concentration of the diluted solution is:

a)

doubled

b)

halved

c)

increased 100 times

d)

decreased 100 times

22.

In which of these equations is water acting as a Bronsted-Lowry acid?

a)

NH3 + H2O ↔ NH4+ + OH-

b)

H2PO4- + H2O ↔ HPO42- + H3O+

c)

HCl + H2O ↔ Cl- + H3O+

d)

NiCl2.6H2O ↔ NiCl2 + 6H2O

23.
In the reaction HCl + H2O --> H3O+ + Cl-, what is the conjugate acid?
a)
HCl
b)
H2O
c)
H3O+
d)
Cl-
24.
What is the conjugate base in the following reaction?
a)
HCO3- 
b)
HCl
c)
 H2CO3 
d)
Cl-
25.

Which of these Ka values corresponds to the strongest acid?

a)

4 x 10-4

b)

5 x 10-4

c)

6 x 10-4

d)

7 x 10-4

26.

Acetic Acid (HC2H3O2) is a weak monoprotic acid. It's concentration is 0.20M and it's Ka value is 1.8x10-5. Calculate it's pH value.

a)

0.698

b)

2.72

c)

11.28

d)

None of the answers are correct

27.

Which of these Ka values corresponds to the weakest (least strong) acid?

a)

9 x 10-10

b)

5 x 10-4

c)

6 x 10-8

d)

7 x 10-2

28.
Oxygen always has an oxidation number of...
a)
-1
b)
1
c)
2
d)
-2
29.
Is calcium oxidized or reduced in the following reaction? 
2CaO--> 2Ca + O2
a)
Oxidized
b)
Reduced
30.
     In the reaction Zn + H2O --> ZnO2 + H2
 which element, if any, is oxidized? 
a)
Zinc
b)
Hydrogen
c)
Oxygen
d)
None
31.
What is the oxidation number of N in NO2-1?
a)
-3
b)
+4
c)
-2
d)
+3
32.
What is oxidation number of Cr in Cr2O72-?
a)
-2
b)
+2
c)
+6
d)
+12
33.
What is oxidation number of O in O2 ?
a)
0
b)
-2
c)
+1
d)
+2
34.

In a Galvanic Cell, the anode is...

a)

positive

b)

negative

35.

In a Galvanic Cell, the cathode is...

a)

positive

b)

negative

36.

Oxidation occurs at the...

a)

anode

b)

cathode

37.

Reduction occurs at the...

a)

anode

b)

cathode

38.

In a Galvanic cell, the electrons flow from the...

a)

anode to the cathode

b)

cathode to the anode

39.

In the list of standard electrode potentials, the strongest reducing agent is...

a)

K

b)

K+

c)

F2

d)

F-

40.

In the list of standard electrode potentials, the strongest oxidising agent is...

a)

K

b)

K+

c)

F2

d)

F-

41.

In a Galvanic Cell, the salt bridge...

a)

completes the circuit so that electrons can flow through the wire

b)

maintains charge balance

c)

is soaked in an unreactive electrolyte such as KNO3

d)

all of the above

42.

In the above Galvanic Cell, which half cell is undergoing reduction?

a)

Cu | Cu2+

b)

Zn | Zn2+

43.

If an electrochemical reaction is spontaneous, what will Ecell be?

a)

positive

b)

negative

44.

A certain galvanic cell has for its spontaneous cell reaction: Zn + HgO → ZnO + Hg

Which is the half-reaction occurring at the anode?

a)

HgO + 2 e- → Hg + O2-

b)

Zn2+ + 2 e- → Zn

c)

Zn → Zn2+ + 2 e-

d)

ZnO + 2 e- → Zn

45.
In electrolytic cell which its electrolyte is copper (II) sulphate, copper are used as electrodes. What is the product at the anode?
a)
Oxygen gas and water
b)
Copper metal
c)
Copper (II) ions
d)
Hydrogen gas
46.
In an electrolytic cell, the positive electrode is the
a)
anode, where oxidation occurs
b)
anode where reduction occurs
c)
cathode where oxidation occurs
d)
cathode where reduction occurs
47.
What occurs during electrolysis of a molten salt?
a)
Electricity is produced by a spontaneous redox reaction
b)
Electricity cause a non-spontaneous redox reaction to occur
c)
Electrons flow through the molten salt
d)
Electrons are removed from both ions of the molten salt
48.
Object is electroplated with copper using copper(II) sulfate. Which statement is correct?
a)
Positive electrode increases in mass
b)
Concentration of Cu2+ ions in solution decreases
c)
Reduction occurs at positive electrode
d)
Reaction at negative electrode is Cu2+ + 2e– → Cu
49.
What happens when molten NaCI is electrolysed in electrolytic cell?
a)
Chlorine is produced at positive electrode
b)
Sodium ions lose electrons at negative electrode
c)
Electrons flow through liquid from -ve electrode to +ve electrode
d)
Oxidation occurs at -ve electrode and reduction at +ve electrode
50.
What is the product formed at the cathode during the electrolysis of molten magnesium fluoride?
a)
magnesium
b)
hydrogen
c)
fluorine
d)
oxygen
51.

When we purify copper using electrolysis...

a)

the pure copper is at the cathode.

b)

the electrolyte contains Cu2+ ions.

c)

impure copper is at the anode.

52.

Which diagram gives the skeletal formula of

2-chloropentan-3-ol ?

a)

A

b)

B

c)

C

d)

D

53.

Give the IUPAC name of this molecular formula C6H14

a)

Hexane

b)

Hexanol

c)

Hexanoic Acid

d)

Hexanal

54.
Is this hydrocarbon saturated or unsaturated? 
a)
saturated
b)
unsaturated
55.

Molecules with the same molecular structure but have different structural formulas are called...

a)

polymers

b)

biomolecules

c)

constitutional polymers

d)

isomers

56.

the type of reaction that occur in alkenes

a)

elimination

b)

substitution

c)

addition

57.

Identify the functional groups present in this compound.

a)

amine

b)

amide

c)

ether

d)

ester

58.

What is the name of this compound?

a)

ethanol

b)

ethanal

c)

ethanone

d)

methanal

59.

3 of the compounds below can turn acidified potassium dichromate (VI) orange to green which are?

a)

propan-1-ol

b)

propan-2-ol

c)

2-methylpropan-2-ol

d)

3,3 dimethylbutan-2-ol

60.
How many carbon atoms are in propane
a)
1
b)
2
c)
3
d)
4
61.

C5H12 + Br2 --> C5H11Br + HBr

This reaction is called____________________.

a)

Substitution

b)

Addition

c)

Cracking

d)

Combustion

62.
The bond that joins amino acids are called:
a)
Peptide Bonds
b)
Ester Bonds
c)
Glycosidic Linkages
d)
Phosphodiester Bonds
63.

If a methyl group (-CH3), which does not like water, were at the 'R', the amino acid would likely be:

a)

Hydrophobic

b)

Hydrophilic

c)

Ionic

d)

Acidic

64.
Amino acids all have the same general structure except for the:
a)
Amino Group
b)
Carboxyl Group
c)
'R' Group
d)
Carbonyl Group
65.
The primary sequence of a protein refers to the:
a)
Order of amino acids
b)
α-Helix or β-Pleated Sheet
c)
Interaction of subunits
d)
Hydrogen Bonding
66.
Structures like an α-Helix are formed because of:
a)
Hydrophobic Interactions
b)
DiSulphide Bridges
c)
Salt Bridges
d)
Hydrogen Bonding
67.
What type of carbohydrate is this?
a)
polysaccharide
b)
disaccharide
c)
monosaccharide
d)
it isn't a carbohydrate
68.
What type of carbohydrate is this?
a)
polysaccharide
b)
disaccharide
c)
monosaccharide
d)
it isn't a carbohydrate
69.
Important to the structural integrity of plant cells, this is the single most popular polysaccharide in the world.
a)
Starch
b)
Glycogen
c)
Cellulose
d)
Chitin
70.

Under basic conditions, lipid molecule hydrolysis produces

a)

Glycerol + Water

b)

Glycerol + Fatty acids

c)

Glycerol + Fatty acid salts

d)

Water + Fatty acids

71.

When reacting Na with Cl2, we calculated that the theoretical yield should be 13 grams. Our actual yield was 12.5 grams. What is the percent yield?

a)

90.4%

b)

104%

c)

96.15%

d)

1.04%

72.
Using the following equation:
Fe2O3(s) + 3H2(g) → 2Fe(s) + 3H2O(l)
How many moles of iron can be made from  6 moles H2? 
a)
4 moles Fe
b)
6 moles Fe
c)
9 moles Fe
d)
2 moles Fe
73.

What is the % atom economy for the formation of ethane in the reaction above?

a)

100

b)

30

c)

28

d)

60

74.

Given the reaction

2KClO3 → 2KCl + 3O2

Masses: O = 16, K = 39, Cl = 35

Calculate the % atom economy for the formation of potassium chloride.

a)

22.4

b)

96

c)

30

d)

60.7

75.

How does Avogadro write to his friends?

a)

Snail mail

b)

With a quill

c)

Whatsapp

d)

E-mole

76.

How do astronauts organize a party?

a)

They star it on their calendar

b)

They make it out of this world

c)

They planet

d)

They reach for the stars

77.

Why can't you trust an atom?

a)

Because they make up everything

b)

Because they can be negative

c)

Because they are radioactive

d)

Because they are charged

78.

What did the limestone say to the geologist?

a)

Rock and roll!

b)

This is how I roll!

c)

You rock!

d)

Don't take me for granite!

79.

How do trees get on the internet?

a)

Root ethernet cables

b)

They log in

c)

They branch out

d)

Leaf wifi

80.

What has a bed that you can't sleep in?

a)

A truck

b)

A river

c)

Bedrock

d)

Bedazzled pants

81.

How did Ben Franklin feel after discovering electricity?

a)

Shocked!

b)

Electrified!

c)

Excited!

d)

Lightening!

82.

What did the thermometer say to the graduated cylinder?

a)

It's hot in here!

b)

You're cracking me up!

c)

You graduated but I've got many degrees!

d)

You're cute!

83.

Why did Hydrogen marry Oxygen?

a)

They felt a strong bond between them

b)

He felt positive about her

c)

He was thirsty

d)

She took his breath away

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