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Chemistry - miscellaneous

Total questions: 30

Worksheet time: 26mins

Name
Class
Date
1.
What is the name of the positive electrode?
a)
cathode
b)
anode
2.

The diagram shows the electrolysis of lead(II) bromide using inert electrodes. Why does the bulb only light up when the lead(II) bromide is melted?

a)

Bromine atoms in lead(II) bromide are converted to ions when it is melted

b)

Electrons flow through the lead(II) bromide when it is melted

c)

The ions in lead(II) bromide are mobile charge carriers in the molten state.

d)

There are no ions in solid lead(II) bromide

3.

Anions get discharged by ________ electrons at the ___________

a)

gaining, cathode

b)

losing, anode

c)

gaining, anode

d)

losing, cathode

4.

Positive ions (cations) move towards the cathode (-) where they will discharge by....

a)

Breaking apart

b)

Losing electrons

c)

Clumping together.

d)

Gaining electrons

5.

Choose the half-equation that shows the discharge of aluminium ion.

a)

Al3+ - 3e- --> Al

b)

Al2+ + 3e- --> Al

c)

Al3+ + 3e- --> Al

d)

Al3+ --> Al + 3e-

6.

If the fork is to be electroplated with silver metal, what electrolyte should be used?

a)

Molten silver chloride

b)

Aqueous silver nitrate

c)

Sodium chloride solution

d)

Copper(II) sulphate solution

7.
What is an ore?
a)
a solid metal
b)
a rock cantaining a metal combined with other elements
c)
an element
d)
an object used to row a boat
8.
What is the removal of oxygen from a substance called?
a)
reduction
b)
extraction
c)
electrolysis
d)
oxidation
9.
What is the name of the process that uses electricity to separate the elements in a compound?
a)
reduction
b)
electrolysis
c)
extraction
d)
mining
10.

For the last ............. .......... ........... the proportion of gases in the atmosphere has been much the same

a)

200 million years

b)

800 million years

c)

1 billion years

d)

200 billion years

11.

The current proportion of gases is approximately

a)

20% nitrogen, 80% oxygen and small proportions of various other gases.

b)

80% nitrogen, 20% oxygen and small proportions of various other gases.

c)

70% nitrogen, 30% oxygen and small proportions of various other gases.

d)

30% nitrogen, 70% oxygen and small proportions of various other gases.

12.

The early atmosphere of Earth contained gases due to ...

a)

Plant life

b)

Algae

c)

Volcanic activity

d)

Dinosaurs

13.

What was the composition of Earth's early atmosphere?

a)

Mostly methane, little to no carbon dioxide

b)

Mostly oxygen, little to no carbon dioxide

c)

Mostly nitrogen, some oxygen

d)

Mostly carbon dioxide, little to no oxygen

14.

Oceans could only form when............

a)

the boiling point of water changed

b)

the melting point of water changed

c)

the Earth cooled enough

d)

photosynthesis began

15.

The carbon dioxide in the early atmosphere reduced due to it .........

a)

dissolving in oceans

b)

forming carbonates in water

c)

forming sedimentary rocks such as limestone

d)

photosynthesising plants

e)

All of the previous points

16.
What is the relative formula mass of CO2?
a)
44
b)
32
c)
16
d)
56
17.
What is the formula for iron(III) oxide?
a)
FeO
b)
Fe3O
c)
Fe3O2
d)
Fe2O3
18.
Calculate the number of gold atoms in a 4 mole sample of gold.
a)
2.41x1024
b)
3.01x1023
c)
4.82x1024
d)
6.02x1023
19.
Calculate the number of moles of Aluminum in a 2.04 mole sample of aluminum oxide, Al2O3.
a)
2.04 moles
b)
4.08 moles
c)
6.12 moles
d)
1.02 moles
20.
What is the mass of one mole of aluminum?
a)
27 g
b)
13 g
c)
54 g
d)
14 g
21.
What is the mass percentage of Carbon in carbon dioxide (CO2)?
a)
27.3%
b)
42.9%
c)
57.1%
d)
72.7%
22.

Which homolgous series contains a C=C double bond?

a)

alkanes

b)

alkenes

c)

alcohols

d)

carboxylic acids

23.
These are found on the Periodic Table.
a)
elements
b)
mixtures
c)
compounds
24.
The compound CHO is...
a)
inorganic
b)
organic
25.
In an exothermic reaction, heat is ...
a)
taken in
b)
given out
26.
What type of reaction occurs in a hand warmer
a)
exothermic
b)
endothermic
27.
If a chemical reaction is EXOTHERMIC, the temperature would....
a)
Stay the same
b)
Increase
c)
Decrease
28.
Have you ever eaten sherbet sweets candy? They fizz in your mouth and your tongue feels cold. Why do you think that is?
a)
It is an exothermic reaction
b)
It is an endothermic reaction
c)
It is made of ice
d)
It is dissolving your mouth
29.
Which letter corresponds to the energy of the products?
a)
A
b)
B
c)
C
d)
D
30.
Which letter corresponds to the energy of the reactants?
a)
A
b)
B
c)
C
d)
D

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