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IGCSE chem review

Total questions: 30

Worksheet time: 22mins

Name
Class
Date
1.

Match the following chemistry words

a)

Substances that cannot be chemically broken down into simpler substances. / A substance having one type of atom. / A substance having atoms with the same proton number.

1.

Element

b)

Pure substances made from two or more, elements chemically combined together.

2.

Compound

c)

 at the center of the atom and contains almost all the mass of the atom.

3.

Nucleus

d)

 A subatomic particle with a relative mass of 1 and a charge +1 found in the nucleus of all atoms.

4.

Proton

e)

an uncharged subatomic particle present in the nuclei (nucleus的复数形式) of atoms

5.

Neutron

2.

Two atoms, X and Y, can be represented as shown.

Which statement is not correct?

a)

X and Y are atoms of different elements

b)

X and Y are isotopes.

c)

X and Y have different mass numbers

d)

X and Y have the same number of electrons.

3.

Match the following chemistry words.

a)

A subatomic particle with negligible mass and a charge of -1

1.

Electron

b)

charged particles made from an atom, (or groups of atoms (polyatomic ions)) by the loss or gain of electrons.

2.

Ion

c)

 a negative ion

3.

Anion

d)

a positive ion

4.

Cation

e)

 The smallest particle (粒子) of an element that can take part in a chemical reaction.

5.

Atom

4.
a)

A

b)

B

c)

C

d)

D

5.

How many electrons are there in the outer electronic shell of chlorine?

a)

5

b)

6

c)

7

d)

8

6.

What is the proton number of 19F - ion?

(a)  

7.

What is the electron number of 19F - ion?

(a)  

8.

Match the following chemical definitions.

a)

The material involved in the change is structurally the same before and after the change.

1.

Physical changes

b)

A change of materials into another, new materials with different properties and one or more than one new substances are formed.

2.

Chemical changes

c)

The characteristic ability of a substance to react to form new substances, can be observed in the chemical reaction.

3.

Chemical properties

d)

A characteristic of a substance that can be observed or measured without changing the identity of the substance.

4.

Physics properties

e)

A substance which increases the rate of a chemical reaction but itself remains unchanged at the end of the reaction.

5.

Catalyst

9.

What is the correct formula of the compound formed from Al3+ and S2-？

a)

Al2S3

b)

Al3S2

c)

AlS

d)

Al2S

10.

Which pair/pairs of chemical name and formula is/are correct?

a)

ammonia NH4

b)

ammonium ion NH4+

c)

iron(II) hydroxide Fe(OH)3

d)

silver carbonate Ag2CO3

11.
The chemical combination of two or more different kinds of atoms in fixed amounts is called a(n)
a)
orbit
b)
compound
c)
mixture
d)
element
12.

Match the following chemical definitions.

a)

A reaction in which two or more substances combine to form a single new substance.

1.

Combination reaction

b)

A type of chemical reaction where a compound breaks down into simpler substances.

2.

Decomposition reaction

c)

are those that essentially will never run out (are inexhaustible)

3.

Renewable resources

d)

the liquid that dissolves the solid solute to form a solution

4.

Solvent

e)

formed when a substance (solute) dissolves into another substance (solvent)

5.

Solution

13.
The air we breathe contains different individual gases (mostly nitrogen and oxygen). Which of the following correctly describes the air we breathe?
a)
compound
b)
liquid
c)
element
d)
mixture
14.
What part of the atom is responsible for determining an atom's chemical properties? 
a)
all electrons
b)
protons
c)
neutrons
d)
valence electrons
15.

How many Nitrogen atoms are in the in H2C3O4N5?

a)

2

b)

3

c)

4

d)

5

16.
In a correctly written symbol what would be located in the "A" position?
a)
number of neutrons
b)
atomic number
c)
number of electrons 
d)
mass number
17.

Match the following chemical definitions.

a)

 the (solid) substance that has dissolved in a liquid (the solvent) to form a solution.

1.

Solute

b)

a process occurring at the surface of a liquid, involving the change of state from a liquid into a vapour at a temperature below the boiling point.

2.

Evaporation

c)

a condition under which gas bubbles can form within a liquid - gas molecules escape from the body of a liquid, not just from its surface.

3.

Boiling

d)

:the change of a vapour or a gas into a liquid; during this process heat is given out to the surroundings.

4.

Condensation

e)

:the direct change of state from solid to gas or gas to solid: the liquid phase is bypassed.

5.

Sublimation

18.
A neutral atom of the isotope 2612Mg would consist of
a)
12 protons, 26 neutrons, 26 electrons
b)
26 protons, 12 neutrons, 26 electrons
c)
26 protons, 14 neutrons, 14 electrons
d)
12 protons, 14 neutrons, 12 electrons
19.

What charge does an atom have when it GAINS electrons?

a)

Positive

b)

Negative

c)

Neutral

20.

What do the chemical symbols N2 and Ni represent?

a)

A

b)

B

c)

C

d)

D

21.

While an object is melting, what happens to the temperature?

a)

increases

b)

decreases

c)

stays the same

22.

Which state of matter do the particles slip and slide past each other?

a)

solid

b)

liquid

c)

gas

23.
The temperature of a substance increases as___.
a)
the substance expands
b)
the average kinetic energy of its particles increases
c)
the substance's volume increases
d)
the substance's mass increases
24.

The melting point of the sample is

a)

-60 ºC

b)

-100 ºC

c)

60 ºC

d)

100 ºC

25.

This curve indicates what about the heat energy?

a)

Heat energy is being added or absorbed

b)

Heat energy is being released

26.
Which diagram best shows the end result of diffusion?
a)
F
b)
G
c)
H
d)
J
27.
Which factor can affect gas pressure?
a)
Temperature 
b)
Volume
c)
The Amount of Gas
d)
All of the answers are correct
28.

Which is the correct formula for aluminum sulfide?

a)

AlS

b)

Al3S2

c)

S3Al2

d)

Al2S3

29.
What is the formula for aluminum fluoride?
a)
AlF
b)
Al2F3
c)
AlF3
d)
Al3F2
30.

What is the charge of ion "X" in the formula XF3?

a)

+3

b)

-3

c)

+1

d)

-1

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