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Chemistry

Total questions: 102

Worksheet time: 3585secs

Name
Class
Date
1.
Choose the particle that has no charge.
a)
nucleus
b)
neutron
c)
proton
d)
electron
2.

The------ particle determines the identity of what element you have'

a)

electron

b)

proton

c)

neutron

d)

valence shell

3.
Which particles make up the nucleus of an atom?
a)
protons and neutrons
b)
electrons and protons
c)
electrons, protons, and neutrons
d)
electrons and neutrons
4.
What is the atomic number of the atom pictured? 
a)
11
b)
12
c)
22
d)
23
5.
What is the atomic mass of the atom pictured? 
a)
11
b)
12
c)
22
d)
23
6.
Oxygen’s atomic number is 8. This means that an oxygen atom must have
a)
8 electrons
b)
8 protons
c)
8 neutrons
d)
a mass number of 8
7.
 What is the mass number of this element?
a)
5
b)
27
c)
32
d)
59
8.

What are valence electrons?

a)

electrons in the first orbital always.

b)

nucleus

c)

the outermost shell

d)

the number of electrons present in the outermost orbital

9.

WhIch sub atomic particle vary between isotopes of an element?

a)

protons, electrons, and atomic mass

b)

protons, electrons, and atomic number

c)

neutrons and electrons

d)

neutrons only

10.
How many neutrons in C-14?
a)
6
b)
7
c)
14
d)
8
11.
Which element has 31 protons ?
a)
Gallium 
b)
Germanium
c)
Gadolinium
d)
Polonium
12.
What number indicates the nucleus?
a)
1
b)
2
c)
3
d)
4
13.
What is at the center of every atom?
a)
An electron
b)
A compound
c)
A molecule
d)
A nucleus
14.
The particles with no charge in an atom are the _______.
a)
electrons
b)
neutrons
c)
protons
d)
protons and neutrons
15.
a)
Nucleus, positive
b)
Nucleus, negative
c)
Nucleus, neutral
d)
Electron Cloud, positive
16.

What is the atomic number of chlorine?

a)

35

b)

18

c)

7

d)

17

17.

How many protons are there in an atom of aluminium?

a)

27

b)

13

c)

14

d)

17

18.

What is the symbol of manganese?

a)

Mg

b)

M

c)

Ma

d)

Mn

19.
What are valence electrons?
a)
electrons on the first orbital always
b)
nucleus
c)
the outermost shell
d)
the number of electrons on the outermost orbital
20.
Oxygen’s atomic number is 8. This means that an oxygen atom must have
a)
8 electrons
b)
8 protons
c)
8 neutrons
d)
a mass number of 8
21.

99.9% of the atom's mass is found where?

a)

nucleus

b)

protons

c)

electron cloud

d)

neutrons

22.

Protons are

a)

negative

b)

positive

c)

neutral

23.

Thompson was the first to discover a subatomic particle - the electron. What are the others?

a)

neutrons & positrons

b)

protons & neutrons

c)

positrons & quarks

d)

protons & positrons

24.

Rutherford concluded that the amount of positive charge varies

a)

with the amount of electrons in the nucleus.

b)

as the the amount of isotopes varies.

c)

with the amount of neutrons in the nucleus.

d)

with different elements.

25.

The word "proton" comes from an ancient Greek word meaning

a)

amber.

b)

to change or become flexible.

c)

proteus.

d)

positive.

26.

Electrons are subatomic particles that exist

a)

inside the nucleus.

b)

in simultaneous dimensions.

c)

in parallel universes.

d)

outside the nucleus.

27.
all matter is made of what 
a)
energy 
b)
atoms 
c)
electrons 
d)
compounds 
28.

Neutrons have almost exactly the same mass as

a)

electrons.

b)

positrons.

c)

protons.

d)

quarks.

29.

James Dalton proved that the true nature of the atom could best be described as resembling "plum pudding."

a)

True

b)

False

30.

Only protons & neutrons can be distinguished by mass, charge and position in an atom.

a)

True

b)

False

31.
What number indicates the nucleus?
a)
1
b)
2
c)
3
d)
4
32.
The particles with no charge in an atom are the _______.
a)
electrons
b)
neutrons
c)
protons
d)
protons and neutrons
33.
a)
Nucleus, positive
b)
Nucleus, negative
c)
Nucleus, neutral
d)
Electron Cloud, positive
34.

What is the atomic number of chlorine?

a)

35

b)

18

c)

7

d)

17

35.

How many protons are there in an atom of aluminium?

a)

27

b)

13

c)

14

d)

17

36.

What is the symbol of manganese?

a)

Mg

b)

M

c)

Ma

d)

Mn

37.
What are valence electrons?
a)
electrons on the first orbital always
b)
nucleus
c)
the outermost shell
d)
the number of electrons on the outermost orbital
38.
Oxygen’s atomic number is 8. This means that an oxygen atom must have
a)
8 electrons
b)
8 protons
c)
8 neutrons
d)
a mass number of 8
39.

Electrons are subatomic particles that exist

a)

inside the nucleus.

b)

in simultaneous dimensions.

c)

in parallel universes.

d)

outside the nucleus.

40.

Neutrons have almost exactly the same mass as

a)

electrons.

b)

positrons.

c)

protons.

d)

quarks.

41.

James Dalton proved that the true nature of the atom could best be described as resembling "plum pudding."

a)

True

b)

False

42.
What is the atomic number of the atom pictured? 
a)
11
b)
12
c)
22
d)
23
43.
 What is the mass number of this element?
a)
5
b)
27
c)
32
d)
59
44.

The central region of an atom where its neutrons and protons are is its

a)

nucleus

b)

core

c)

electron cloud

d)

centre

45.

What does the nucleus of an atom contain?

a)

Electrons and neutrons

b)

Protons and neutrons

c)

Electrons and protons

d)

Neutrons and electrons

46.

What is the symbol of sodium?

a)

S

b)

NA

c)

Na

d)

So

47.

What is the atomic number of chlorine?

a)

35

b)

18

c)

7

d)

17

48.

How many protons are there in an atom of aluminium?

a)

27

b)

13

c)

14

d)

17

49.

What is the number of nucleons in an atom of boron?

a)

5

b)

6

c)

16

d)

11

50.

How many neutrons are found in atom of sulphur?

a)

16

b)

32

c)

6

d)

8

51.

What is the symbol of manganese?

a)

Mg

b)

M

c)

Ma

d)

Mn

52.

How many electrons are there in an atom of potassium with mass number 39 and atomic number 19?

a)

19

b)

20

c)

39

d)

9

53.

What is the atomicity of oxygen?

a)

16

b)

2

c)

8

d)

6

54.

What is the electronic configuration of nitrogen?

a)

(2, 5)

b)

(2, 2, 3)

c)

(3, 4)

d)

(2, 2, 2, 1)

55.

An atom of phosphorous has 15 electrons. What is the valency of phosphorous?

a)

5

b)

3

c)

2

d)

1

56.

Ink can be separated by a method of -----------------------------------------------

a)

distillation

b)

filtration

c)

chromatography

d)

sedimentation

57.
chromatography separates the mixture of dyes on the basis of their ----------------------------
a)
density
b)
solubility
c)
gravity
d)
boiling point
58.
On the chromatogram given -------------- is mixture.
a)
red
b)
orange
c)
green
d)
black
59.

A pure substance shows ------------------ spot on chromatogram

a)

0

b)

1

c)

2

d)

3

60.

A substance is soluble if it can be dissolved.


In paper chromatography, the most soluble solute _____________________ .

a)

does not move from the start point

b)

stays closest to the start point

c)

travels furthest away from the start point

d)

can be found in the middle of the chromatogram

61.

What is the correct image of paper chromatography???

a)
b)
c)
62.

What is chromatography?

a)

A way to see pretty colors

b)

A laboratory technique used to separate a mixture.

c)

A form of distillation

63.

Two or more substances that are mixed together but not chemically combined create a...

a)

solvent

b)

compound

c)

mixture

64.

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

65.

Which of the following is correct about chromatography?

a)

It separates those solutes that dissolve in the same solvent.

b)

It separates those solutes that dissolve in different solvents.

c)

It separates a solute that dissolves in a solid solvent.

d)

It separates gaseous solutes from liquid solvents.

66.
Why must the base line be drawn in pencil and not pen?
a)
a) Pencil is good at keeping substances in place.
b)
b) Pencil is soluble in water
c)
c) Pencil is insoluble in water
d)
d) Pencil is not coloured
67.

Ali carried out a chromatography experiment using a coloured dye and the result is shown in below. How many different colours are present in the coloured dye?

a)

2

b)

3

c)

4

d)

5

68.

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

69.

A clothing factory dumps waste water containing toxic dyes into the river. Azmi collected some water samples from the river and wanted to prove that the dyes are harmful. Which method could he use to separate the dyes into different colours?

a)

Chromatography

b)

Crystalisation

c)

Distillation

d)

Filtration

70.

Which is the correct method to separate coloured dyes?

a)

Chromatography

b)

Distillation

c)

Evaporation

d)

FIltration

71.

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

72.

Which two were the same mixture of dyes?

a)

1 and 5

b)

2 and 6

c)

3 and 4

d)

4 and 6

73.

Which of the dyes was a pure substance?

a)

1

b)

2

c)

3

d)

4

74.

The more soluble colors will travel (a)   up the paper.

75.
The diagram below shows a chromatogram obtained when a sample X was analysed together with four other known dyes P, Q, R and S. Dye Q was known to cause cancer. Which of the following dye(s) is/are safe for use?
a)
P only
b)
S only
c)
P and S
d)
P and X
76.
Which plant species has plant pigments most similar to those in A?
a)
B
b)
C
c)
D
77.

What is chromatography?

a)

A way to see pretty colors

b)

A laboratory technique used to separate a mixture.

c)

A form of distillation

78.
Why is Chromatography useful?
a)
It can be used as medicine.
b)
It can be used for finding clues at a crime scene
c)
It can be used to make bombs.
d)
It can reduce the lack of food and water.
79.
Why must the base line be drawn in pencil and not pen?
a)
a) Pencil is good at keeping substances in place.
b)
b) Pencil is soluble in water
c)
c) Pencil is insoluble in water
d)
d) Pencil is not coloured
80.

If a substance is not soluble in the solvent, what happens to the spot placed on the start line?

a)

a) Dot moves to the top of the paper

b)

b) Dot does not move at all

c)

c) Dot moves to the left or right

d)

d) Dot moves down to the bottom of the paper

81.

In paper chromatography, the MOST soluble solute ______,

a)

does not move from the start point

b)

stays closest to the start point

c)

travels furthest away from the start point

d)

can be found in the middle of the chromatogram

82.

In paper chromatography, the LEAST soluble solute ____.

a)

does not move from the start point

b)

stays closest to the start point

c)

travels furthest away from the start point

d)

can be found in the middle of the chromatogram

83.
In chromatography, if a solute does not separate and remains on the start line ....
a)
the solute is insoluble in the solvent
b)
the solute is soluble in the solvent
c)
the solvent is insoluble in the solute
d)
the solvent is soluble in the solute
84.

A pure substance shows ------------------ spot on chromatogram

a)

0

b)

1

c)

2

d)

3

85.

A substance is soluble if it can be dissolved.


In paper chromatography, the most soluble solute _____________________ .

a)

does not move from the start point

b)

stays closest to the start point

c)

travels furthest away from the start point

d)

can be found in the middle of the chromatogram

86.

The colour of plant leaves is due to a mixture of pigments.


Which method is used to separate these pigments?

a)

filtration

b)

evaporation

c)

distillation

d)

chromatography

87.

How many VALANCE ELECTRONS are present in this atomic structure?

a)

2

b)

6

c)

4

d)

Can not be determined

88.

Protons have a ______ charge

a)

Negative

b)

Neutral

c)

MIB

d)

Positive

89.

An Electron has a (a)   charge

90.

Neutron has a charge of______

a)

Positive

b)

Negative

c)

Neutral

91.

Number of Electrons= number of (a)  

92.

Usually the number of protons___the number of Neutrons

a)

<

b)

>

c)

+

d)

=

93.

A Nucleus of an atom consists of____ and______

(a)  

94.

What is the atomic weight of an atom if the Electrons are 7?

a)

14

b)

7

c)

4

d)

21

e)

Can not be determined

95.

What is the atomic mass of the element fluorine?

a)

18

b)

19

c)

20

d)

9

e)

4

96.

Where is the atomic mass of the element mentioned?

a)

Bottom

b)

Top

c)

On top and bottom both

d)

It isn't mentioned!

97.

Which element comes after Nitrogen?

(a)  

98.

Which element has 19 Electrons?

(a)  

99.

Which is the 31st Element?

a)

Hydrogen

b)

Oxygen

c)

Gallium

d)

glycerol

100.

The particle in an atom that account for the most weight of the Atom.

a)

Protons

b)

Electrons

c)

Neutrons

d)

Nucleus

101.

The particle in an atom that accounts least weight_______

a)

Nucleus

b)

Protons

c)

Neutrons

d)

Electron

102.

How many Protons are present in this Element?

a)

10

b)

20

c)

5

d)

Can not be determined

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