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Worksheets

Year 8 chemistry revision

Total questions: 40

Worksheet time: 31mins

Name
Class
Date
1.
What is the formula for magnesium chloride?
a)
MgCl
b)
Mg2Cl
c)
MgCl2
d)
Mg(ClO3)2
2.
What is the formula for magnesium chloride?
a)
MgCl
b)
Mg2Cl
c)
MgCl2
d)
Mg(ClO3)2
3.

Magnesium (Mg) can be burned in oxygen (O2) to produce solid magnesium oxide (MgO).

a)

Mg(s) + O2(g)→ MgO(s)

b)

Mg(s) + O(g) → MgO(s)

c)

Mg(s) + CO2(g) → MgO(s) + C(s)

d)

Mg(s) + O2(g) → Mg2O2(s)

4.
What is the correct formula for the compound, lithium oxide?
a)
LiO
b)
Li2O
c)
LiO2
d)
Li2O2
5.

Complete the word equation below.


Magnesium + oxygen --> .....

a)

Magnesium

b)

Magnesium oxide

c)

Oxides

d)

Magnesium oxide + water

6.

Which of these is a chemical reaction?

a)

boiling

b)

burning

c)

condensing

d)

melting

7.

The reaction of surface of atoms of a metal with oxygen, or other substances is called _________________

a)

combustion

b)

respiration

c)

corrosion

d)

reaction

8.

The metals that do not reactive with oxygen.

a)

Gold & Zinc

b)

Zinc & Platinum

c)

Platinum & Gold

d)

Copper & Gold

9.

Metal + Oxygen -->

a)

Metal hydroxide

b)

Metal oxide

c)

Metal chloride

d)

Salt

10.

Pure elements are made up of

a)

only one type of atom

b)

two types of atoms

c)

many kinds of atoms

d)

every atom is exactly the same

11.

Pure elements are made up of

a)

only one type of atom

b)

two types of atoms

c)

many kinds of atoms

d)

every atom is exactly the same

12.

Silver marked with 900 is

a)

925 atoms out of 1000 atoms

b)

is more pure than 92.5%

c)

900 atoms are other elements

d)

90% pure

13.

Pure diamonds are made of

a)

carbon and nitrogen

b)

carbon atoms only

c)

carbon and hydrogen

d)

carbon and boron

14.

24 carat gold is

a)

yellow

b)

brown

c)

red

d)

grey

15.

14 carat gold is

a)

75% pure

b)

100% pure

c)

less than 58% pure

d)

58 parts gold out of 24

16.

Which two were the same mixture of dyes?

a)

1 and 5

b)

2 and 6

c)

3 and 4

d)

4 and 6

17.

A sample of ink was compared with four different dyes using chromatography. The results are shown in figure below. Which two dyes does this ink contain?

a)

1 and 2

b)

1 and 4

c)

2 and 3

d)

2 and 4

18.

Figure below shows a chromatogram obtained from a police investigation. Which suspect A, B, C or D is most likely to have been at the crime scene?

a)

SUSPECT A

b)

SUSPECT B

c)

SUSPECT C

d)

SUSPECT D

19.

Why must the start line be drawn in pencil and not pen?

a)

a) Pencil lead is good at keeping substances in place.

b)

b) Pencil lead is soluble in water

c)

c) Pencil lead is insoluble in water

d)

d) Pencil lead is not coloured

20.

Which of the following mixture/s is/are separated by chromatography?

a)

Pigments from natural colours

b)

Colours in a dye

c)

Colours of flowers extracts

d)

All the above

21.
Which plant species has plant pigments most similar to those in A?
a)
B
b)
C
c)
D
22.

In an endothermic reaction, heat is ...

a)

taken in

b)

given out

23.

Oxidation (rusting) is an exothermic reaction, what do I mean by exothermic?

a)

Heat enters the reaction from the surroundings

b)

Heat exits the reaction to the surroundings

24.

The definition of solution.

a)
A solution is a solid substance only.
b)
A solution is a mixture of gases only.
c)
A solution is a type of chemical reaction.
d)
A solution is a homogeneous mixture of a solute and a solvent.
25.
What is a solvent
a)
the liquid in which a solute is dissolved to form a solution.
b)
Another word for solution
c)
A thing that make drinks turn colors
d)
Its a metal molecole
26.

The substance that does the dissolving

a)

Solute

b)

Solvent

c)

Solution

d)

Miscibility

27.
What number indicates an electron?
a)

A. 1

b)

B. 2

c)

C. 3

d)

D. 4

28.
Atomic model was termed the "plum pudding model"
a)
Joseph Thomson
b)
Niels Bohr
c)
Ernest Rutherford
29.
His atomic model included a dense positive core in an atom, surrounded by negatively charged particles
a)
Joseph Thomson
b)
Niels Bohr
c)
Ernest Rutherford
30.
This model was developed after J.J. Thompson discovered electrons, a particle smaller than an atom. Is shows electrons floating freely in a positive space.
a)
The "Plum Pudding Model" of the atom
b)
The "Rutherford Model" of the atom
c)
Democritus's model of the atom
d)
The "Quantum Mechanical Model" of the atom
31.
This model added on to previous models by showing electrons existed at certain "energy levels". However it does not accurately show what those levels look like.
a)
The "Bohr Model" of the atom
b)
The "Rutherford Model" of the atom
c)
The "Plumb Pudding Model" of the atom
d)
The "Quantum Mechanical Model" of the atom
32.
This model this model was the first to show a nucleus, consisting of protons and neutron.  Electrons surround the nucleus but are not shown in distinct energy levels. 
a)
The "Rutherford Model" of the atom
b)
The "Plum Pudding Model" of the atom
c)
The "Quantum Mechanical Modell" of the atom
d)
Democritus's model of the atom
33.

The atomic number for Oxygen is 8, so

a)

there are 8 protons in the atom

b)

the atomic mass is less than 8

c)

the mass of the atom is 8

d)

there are 8 electrons

34.

The atomic number for Oxygen is 8, so

a)

there are 8 protons in the atom

b)

the atomic mass is less than 8

c)

the mass of the atom is 8

d)

there are 8 electrons

35.

What is this subatomic particle that has no charge?

a)

Electron

b)

Neutron

c)

Proton

d)

Megatron

36.

What is this subatomic particle that has positive charge?

a)

Electron

b)

Neutron

c)

Proton

d)

Megatron

37.

What is this subatomic particle that has negative charge?

a)

Electron

b)

Neutron

c)

Proton

d)

Megatron

38.

The center of an atom is known as the

a)

nucleus

b)

electron cloud

c)

neutron cloud

d)

mass circle

39.
How many electrons does Sodium have?
a)
11
b)
23
c)
12
40.
What is the atomic number of Boron?
a)
5
b)
11
c)
6

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