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chemistry entrance test

Total questions: 25

Worksheet time: 16mins

Name
Class
Date
1.
Which of the following represents an element?
a)
H2O
b)
H2
c)
NaCl
d)
CaCO3
2.

What makes elements and compounds different from mixtures? Elements & compounds-

a)

have a constant composition (pure substances)

b)

are made of gases

c)

Will not change when heated

d)

conduct electric current

3.
These can only be separated by chemical means. 
a)
element 
b)
compound 
c)
mixture 
d)
stuff 
4.
What is the atomic mass of magnesium?
a)
2
b)
4
c)
12
d)
24
5.
The relative molecular mass of a compound is equal to the sum of its
a)
Atomic mass
b)
Atomic number
c)
Oxidation number
d)
Valence electrons
6.
The relative atomic mass is the average mass of an atom compared to 
a)
the mass of a carbon-12 atom.
b)
1/12 the mass of a carbon-12 atom
c)
the mass of a hydrogen atom
d)
1/12 the mass of a hydrogen atom
7.
What is the relative atomic mass of sodium?
a)
11
b)
23
c)
46
d)
64
8.

Which of the following is true?

a)

An atom must always have a proton, neutron and electron.

b)

An atom can have only electrons and neutrons but no proton.

c)

The number of protons are equal to number of electrons.

d)

The number of neutrons cannot be more than 2.

9.

The isotopes of an element contains _______________ .

a)

same number of neutrons but different number of protons

b)

same number of neutrons but different number of protons

c)

different number of protons as well as different number of neutrons

d)

different number of neutrons but same number of protons

10.

Which term best matches the following definition?


Definition: the mass of an atom of a chemical element expressed in atomic mass units. It is approximately equivalent to the number of protons and neutrons in the atom.

a)

Atomic Number

b)

Mass Number

c)

Net Charge

d)

Chemical Symbol

11.

Which tool could you use to separate large and small particles?

a)

A sieve

b)

A distillation flask

c)

Chromatography

d)

Evaporating basin

12.

Which of the following techniques could be used to separate a heterogeneous mixture?

a)

Filtration

b)

Chromatography

c)

Magnetic separation

d)

Seiving

13.

To separate a mixture of salt and water what separation method is used?

a)

Filtration

b)

Distillation

c)

Chromatography

d)

Evaporation to dryness

14.

Which of the following techniques can we use to separate homogeneous mixtures?

a)

Crystallisation

b)

Distillation

c)

Evaporation

d)

All of the above

15.

Name the separation technique

a)

Centrifuge

b)

Crystallisation

c)

Distillation

d)

Evaporation

16.

Which of the following techniques can we use to separate homogeneous mixtures?

a)

Crystallisation

b)

Distillation

c)

Evaporation

d)

All of the above

17.
The top number in this isotope notation is
a)
the mass number
b)
the atomic number
c)
the atomic mass
d)
the neutron number
18.
How many protons does He have?
a)
4
b)
2
c)
6
d)
0
19.
What do these isotopes of carbon all have in common?
a)
neutrons & mass number
b)
atomic number and neutrons
c)
atomic number and electrons
d)
protons, atomic number, and mass number
20.

How would you write the isotope name from this nuclide symbol?

a)

Sodium-23

b)

Sodium-11

c)

Sodium-12

d)

Sodium-22

21.

Calculate the average atomic mass of silver.

a)

106.38649amu

b)

111.91896amu

c)

107.8677amu

d)

121

22.

The law of multiple proportions states that...

a)
The ratio of the masses of one element that combine with a fixed mass of another element can be expressed in small whole numbers
b)
The mass of an atom is always a multiple of the mass of a hydrogen atom
c)
The pressure of a gas is directly proportional to its temperature
d)
The volume of a gas is inversely proportional to its pressure
23.
In order for an atom to be neutral what has to be true?
a)
The atom has more protons than neutrons
b)
The atom has more neutrons than protons
c)
The atom has the same number of protons and neutrons
d)
The atom has the same number of protons and electrons
24.

Which of the particles below represent an ion (Select all that applies)

a)

K+

b)

Na

c)

Cl-

d)

Fe3+

e)

SO42-

25.

What is the name of the element that has the symbol of P

a)

Potassium

b)

Phosphorus

c)

Phosphate

d)

Phosphoric acid

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