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Chemistry Unit 3 AOS1

Total questions: 60

Worksheet time: 52mins

Name
Class
Date
1.
The SI unit of heat and energy is the __________.
a)
calorie
b)
heat
c)
joule
d)
watt
2.
Temperature is a measure of average [blank] energy of individual atoms.
a)
heat
b)
potential
c)
mechanical
d)
kinetic
3.
ΔH value in an endothermic reaction is a positive number.
a)
True
b)
False
4.
Which phase of matter has the greatest motion and least orderly arrangement?
a)
solid
b)
liquid
c)
gas
5.
True/False: The rate of a chemical reaction is unrelated to the spontaneity of the reaction.
a)
True
b)
False
6.
A catalyst works by
a)
changing the order of the reaction
b)
increasing the temperature
c)
lowering the activation energy
d)
making the activated complex
7.
 For which of these processes is the value of ΔH expected to be positive?
1.  The temperature increases when calcium chloride dissolves in water.
 2.  Steam condenses to liquid water
3.  Water boils
4.  Dry ice sublimates
a)
4 only
b)
1 only
c)
3 and 4 only
d)
2 and 3 only
8.
What type of reaction is shown in the reaction pathway?
a)
endothermic reaction
b)
exothermic reaction
9.
What type of reaction is shown in the reaction pathway?
a)
endothermic reaction
b)
exothermic reaction
10.
N2 +  3H2 −->  2NH3 
How many moles of ammonium are produced when 3 moles of nitrogen react with hydrogen?
a)
6 moles Ammonium
b)
1.5 moles ammonium
c)
9 moles ammonium
d)
9 moles hydrogen
11.
 _?_  is the amount of energy required to raise the temperature of 1 gram of any substance 1oC.
a)
Specific heat
b)
A calorie
c)
Thermal energy
d)
Conduction
12.
_?_  is the amount of energy (joules) required to raise the temperature of 1 mole of a substance by 1 K.  Units are J/mol-K.
a)
Thermal energy
b)
Molar heat capacity
c)
A calorie
d)
Specific heat
13.
How much heat is needed to form 40.0 L of NO2 from its elements at STP? , Vm=22.4L
N2+ 2O2 -> 2NO2
ΔH = +67kJ
a)
58.2 kJ
b)
29.1
c)
59.8
d)
119.6
14.
Combustion is when a __________ reacts with oxygen
a)
petrol
b)
fuel
c)
fire triangle
d)
carbon dioxide
15.
What are the types of combustion?
a)
Complete & incomplete
b)
Incomplete & inexact
c)
Impossible & complete
d)
Computer & incompete
16.
Complete combustion is when there is plenty of oxygen to react with. 
a)
True
b)
False
17.
Incomplete combustion is when there is a limited amount of oxygen.
a)
True
b)
False
18.
A compound that contains only carbon and hydrogen and that produces carbon dioxide and water when burned is called a(n)
a)
binary compound
b)
carbonate
c)
ionic compound
d)
hydrocarbon
19.
Is combustion a reversible reaction?
a)
Yes.
b)
No.
20.
What kind of energy conversion does a combustion reaction involve?
a)
Kinetic to Potential Energy
b)
Chemical Potential Energy to Kinetic or Thermal Energy
c)
Potential Energy to Nuclear Energy
d)
Mass to Energy
21.
Which of the following chemical reactions involve combustion?
a)
A forest fire
b)
Human digestion
c)
A car using gasoline
d)
All of the above
22.
The initial energy required to start a combustion reaction is called
a)
Potential Energy
b)
Kinetic Energy
c)
Chemical Potential Energy
d)
Activation Energy
23.

8.7: Combustion is when a __________ reacts with oxygen

a)

petrol

b)

fuel

c)

fire triangle

d)

carbon dioxide

25.

List four factors that affects the rate of a reaction

a)

temperature

b)

concentration

c)

surface area

d)

volume

e)

catalysts

25.

List four factors that affects the rate of a reaction

a)

temperature

b)

concentration

c)

surface area

d)

volume

e)

catalysts

26.

A temperature increase causes the particles ......

a)

to slow down

b)

move faster

c)

collide higher

d)

in the right order

27.

How does a catalyst work in speeding up a reaction?

a)

By lowering the activation energy or reaction

b)

by giving them more energy

c)

by making them more available

28.
The following graph shows two different reaction pathways for the same overall reaction at the same temperature. Which pathway is slower and why?
a)
Red, because the activation energy is larger
b)
Blue, because the activation energy is lower
c)
both reaction progress at the same rate
29.
What does NOT happen when the temperature is increased?
a)
Particles collide more often
b)
Particles collide with more energy
c)
Particles move faster
d)
More particles collide in the correct orientation
30.
What is the rate of reaction?
a)
How fast a reaction is 
b)
How big a reaction is
c)
How loud a reaction is
d)
How much gas a reaction produces
31.
Grinding a seltzer tablet into powder increases the rate of reaction due to increased
a)
concentration
b)
surface area
c)
temperature
d)
reactants
32.

In a Galvanic Cell, the anode is...

a)

positive

b)

negative

33.

In a Galvanic Cell, the cathode is...

a)

positive

b)

negative

34.

Oxidation occurs at the...

a)

anode

b)

cathode

35.

Reduction occurs at the...

a)

anode

b)

cathode

36.

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

a)

anode to the cathode

b)

cathode to the anode

37.

Ecell =

a)

Ered - Eox

b)

Ered + Eox

c)

Eox - Ered

d)

Eox + Ered

38.

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

a)

K

b)

K+

c)

F2

d)

F-

39.

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

a)

K

b)

K+

c)

F2

d)

F-

40.

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

a)

Cu | Cu2+

b)

Zn | Zn2+

41.

In any Galvanic Cell, which half cell will undergo reduction?

a)

The half cell with the lower standard electrode potential

b)

The half cell with the higher standard electrode potential

42.

Consider the galvanic cell reaction Zn (s) + Cu2+ (aq) → Cu (s) + Zn2+ (aq) When the cell is running spontaneously, which is the only true statement?

a)

The copper electrode loses mass and the zinc electrode is the cathode.

b)

The copper electrode gains mass and the copper electrode is the cathode.

c)

The zinc electrode gains mass and the zinc electrode is the anode.

d)

The zinc electrode loses mass and the zinc electrode is the cathode.

43.

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

Which is the half-reaction occurring at the cathode?

a)

HgO + 2 e- → Hg + O2-

b)

Hg → Hg2+ + 2 e-

c)

Zn → Zn2+ + 2 e-

d)

ZnO + 2 e- → Zn

44.

What is the standard electrode which all other standard electrode potentials are measured against?

a)

helium

b)

hydrogen

c)

magnesium

d)

potassium

45.

Select all the standard conditions used to measure the standard electrode potentials:

a)

electrolyte solution 1 moldm-3

b)

298K temperature

c)

all chemicals in gaseous form

d)

1atm pressure

e)

standard hydrogen electrode as comparison

46.

Why does the voltage from a chemical cell that is connected in a circuit with a lamp eventually reach zero?

a)

The lamp breaks

b)

One of the reactants is used up

c)

The circuit becomes broken

47.

What is produced by a hydrogen-oxygen fuel cell?

a)

Water and Carbon Dioxide

b)

Carbon Dioxide

c)

Water

48.

What happens to hydrogen molecules in a hydrogen-oxygen fuel cell?

a)

They form hydrogen ions, H+ , and electrons, e-

b)

They form hydrogen ions, H+ , and electrons, e+

c)

They form hydrogen atoms, H

49.

What happens to oxygen molecules in a hydrogen-oxygen fuel cell?

a)

They react with electrons to form oxide ions, O2-

b)

They react with hydrogen ions to form hydroxide ions, OH-

c)

They react with hydrogen ions and electrons to form water

50.

Which of these is a disadvantage of cars driven by hydrogen-oxygen fuel cells rather than by petrol engines?

a)

They have fewer moving parts

b)

There are fewer suitable filling stations

c)

They emit little pollution

51.

What is a strength of using hydrogen-oxygen fuel cells in manned spacecraft, compared to using chemical cells?

a)

They produce electricity

b)

They produce water that the astronauts can drink

c)

They produce a voltage

52.

What is a disadvantage of using solar photovoltaic cells to provide electricity in a spacecraft?

a)

Photovoltaic cells have lots of moving parts

b)

Photovoltaic cells release toxic byproducts

c)

Photovoltaic cells only work when the spacecraft is in direct sunlight

53.

An oxidising agent _______ electrons

a)

Gains

b)

Loses

54.

An reducing agent _______ electrons

a)

Gains

b)

Loses

55.

Above is a section of the electrochemical series. The strongest oxidising agent in this section is...

a)

Ag+ (aq)

b)

Ag (s)

c)

Sn4+ (aq)

d)

Sn2+ (aq)

56.

Above is a section of the electrochemical series. The weakest oxidising agent in this section is...

a)

Ag+ (aq)

b)

Ag (s)

c)

Sn4+ (aq)

d)

Sn2+ (aq)

57.

Above is a section of the electrochemical series. The weakest reducing agent in this section is...

a)

Ag+ (aq)

b)

Ag (s)

c)

Sn4+ (aq)

d)

Sn2+ (aq)

58.

Which is the correct formula for determining the potential difference of the cell?

a)

Eocell = Eooxidant - Eoreductant

b)

Eocell = Eoreductant - Eooxidant

c)

Eocell = Eooxidant + Eoreductant

59.
Which NRL team does she go for?
a)
West Tigers
b)
Sydney Roosters
c)
Canterbury Bulldogs
d)
Brisbane Broncos
60.
Which country has Ms NOT visited?
a)
Cambodia
b)
Brazil
c)
Argentina
d)
America

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