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Worksheets

Grade-7

Total questions: 77

Worksheet time: 1hrs 10mins

Name
Class
Date
1.
Which of the following describes covalent bonds?
a)
Bonds form because of opposite charges
b)
Bonds form to fill outer electron shells
c)
Electrons are transferred between atoms
d)
Covalent bonds are magical
2.
Protons have a charge of:
a)
-1
b)
+1
c)
-2
d)
+2
3.
Electrons have a charge of:
a)
-1
b)
-2
c)
+1
d)
+2
4.
Most atoms have no net charge because they have....
a)
an equal number of charged and non-charged particles
b)
neutrons in their nuclei
c)
an equal number of electrons and protons
d)
an equal number of neutrons and protons
5.
What would you name this molecule?
a)
SNa3
b)
H3O
c)
NaCl
d)
H2O
6.
What molecule is this?
a)
CO
b)
CO2
c)
C2O
d)
C2O2
7.
If a you saw the following, K+; what does it tell you about the  the ion.
a)
it has lost one electron 
b)
it has lost one proton 
c)
it has lost two electrons 
d)
it is a negative ion 
8.
In a covalent bond, one or more electrons are? 
a)
shared 
b)
lost 
c)
gained 
d)
transferred 
9.
What does a sodium atom become when it loses its only valence electron?
a)
sodium compound
b)
sodium atom
c)
ionic compound
d)
sodium ion
10.
What is the charge of a sodium ion with 11 protons and 10 electrons?
a)
1+
b)
1-
c)
2+
d)
2-
11.

If an atom has no charge, which of the following must be true?

a)

It has more neutrons than protons or electrons.

b)

There are only neutrons inside the atom.

c)

Its number of protons is equal to its number of electrons.

d)

The neutrons in the atom outnumber the electrons and protons.

12.

Which of these are an ion?

a)

3 protons, 3 neutrons, 3 electrons.

b)

8 protons, 8 neutrons, 8 electrons

c)

2 protons, 3 neutrons, 2 electrons

d)

6 protons, 6 neutrons, 7 electrons

13.
Covalent compounds
a)
Share electrons
b)
transfer electrons
c)
None
d)
conduct electricity
14.
If a potassium atom loses one electron, a positive ion results.
a)
TRUE
b)
FALSE
15.
What is an atom or group of atoms that has an electric charge?
a)
ion
b)
metal
c)
nonmetal
d)
ionic compound
16.
If an atom of nitrogen gains 3 electrons, what is its overall charge?
a)
Neutral - No charge
b)
+3
c)
-3
d)
-1
17.
How many valence electrons does nitrogen have?
a)
3
b)
2
c)
5
d)
1
18.
What can be generalized about covalent bonds?
a)
Electrons will be exchanged.
b)
Electrons will be transferred.
c)
Electrons will be given and taken.
d)
Electrons will be shared.
19.

Carbon is in 4A, so how many bonds can it form based on electrons needed to fill its outer shell?

a)

1

b)

3

c)

4

d)

5

20.
What two types of atoms make a covalent bond?
a)
2 Nonmetals
b)
1 Nonmetal & 1 Metal
c)
2 Metals
d)
2 Noble Gases
21.
What is a diatomic element?
a)
a metal bonded with a nonmetal
b)
2 or more nonmetals bonded together
c)
2 or more metals bonded together
d)
2 atoms of the same element bonded together
22.

What is the correct formula for this molecule?

a)

CH

b)

C1H4

c)

CH4

d)

C4H

23.

Why are dots and crosses used to show the electrons in the bonds?

a)

To show which atoms the electrons belong to

b)

Because this is what electrons looks like

c)

To show if the electron came from a metal

d)

To show if the electrons are gained or lost

24.

Single bonds are formed when ____ pair(s) of valence electrons are shared.

a)

one

b)

three

c)

two

d)

four

25.
What is the correct formula for this molecule?
a)
NH
b)
N3H
c)
NH3
d)
NH4
26.

How many electrons are involved in bonding in this molecule?

a)

2

b)

3

c)

4

d)

8

27.

Covalent bonds form between which of the following?

a)

metal and non-metal ion

b)

non-metal and non-metal ions

c)

metal and non-metal atoms

d)

non-metal atoms only

28.

Single covalent bonds form when...

a)

atoms share a pair of electrons

b)

atoms donate electrons

c)

atoms share an electron

d)

atoms form compoounds

29.

In a covalent bond the electrons involved in bonding are...

a)

attracted to each other

b)

attracted to other pairs of electrons

c)

attracted to other paired electrons

d)

attracted to the nucleus of each atom

30.

Covalent bonds are every strong. What type of forces hold the bond together making them so strong?

a)

Magnetic

b)

Friction

c)

Electrostatic

d)

Electromagnetic

31.

Dot and cross diagrams are used to show bonding in covalent compounds. Which of the following is NOT an advantage of this type of diagram?

a)

Show the overlap of outer electron shells

b)

Show the atoms which share electrons

c)

Show the number of shared electron pairs

d)

Show the sizes of the atoms sharing electrons

32.

Displayed formula shows covalent bonds as a single line between atoms. Which of the following is NOT shown in this type of formula?

a)

How atoms are connected

b)

3D structure

c)

Which atoms the electrons come from

d)

The number of each type of atom in the compound

33.

Three dimensional ball and stick models show the atoms (ball), the covalent bonds (sticks) and their arrangement in space. What is no shown in this type of model?

a)

electron pairs

b)

shared electrons

c)

number of atoms involved

d)

where the electrons have come from

34.

The diagram shows the ball and stick model for ammonia. Molecular formula show how many and which atoms are in a compound.

What is the molecular formula of ammonia?

a)

H2NH

b)

NH3

c)

HNHH

d)

H2NH

35.

What type of formula is shown in the diagram?

a)

Dot and cross

b)

Ball and stick

c)

Displayed formula

d)

Molecular formula

36.

What type of formula is shown in the diagram?

a)

Dot and cross

b)

Ball and stick

c)

Displayed formula

d)

Molecular formula

37.

How do we identify covalent compounds or substances?

a)

they are made up of metals and non-metals

b)

they are made up of non-metals only

c)

they are made up of metals only

38.

Which of the following are covalent substances?

a)

CO2

b)

NH3

c)

NaF

d)

N ≡ N

e)

MgO

39.

What are covalent bonds?

a)

transfer of electrons

b)

sharing of electrons

40.

Which of the following is the correct dot-and-cross diagram of fluorine molecule?

a)
b)
c)
d)
41.

Which of the following dot-and-cross diagrams of water molecule are correct (valence shell only)?

a)
b)
c)
d)
42.

What is the chemical formula of phosphorous trichloride?

a)

P3Cl

b)

P3Cl

c)

P3Cl

d)

PCl3

43.

Covalent substances have _________ melting point and boiling points due to __________ ________________ forces of attraction. (type the 3 answers with a space between the words.)

(a)  

44.

Covalent substances are usually (a)   in water.

45.

Which keywords explain whether covalent substances conduct electricity or not?

a)

conduct electricity

b)

does not conduct electricity

c)

free moving ions

d)

no free moving ions nor electrons

e)

neutral, no charge

46.

Which of the following is/are most likely covalent substance(s)?

a)

A: has a boiling point of 78 oC.

b)

B: forms a solution that can light up a lightbulb.

c)

C: insoluble in water and has weak forces of attraction.

d)

D: has a melting point of 500 oC and conducts electricity when melted.

47.

What is the chemical formula of ammonia which is made up of nitrogen and hydrogen atoms? [ N (2, 5) ; H(1) ]

a)

NH

b)

NH2

c)

N3H

d)

NH3

48.

Which statements compare ionic compounds and covalent compounds correctly?

a)

ionic compounds are made up of ions while covalent compounds are made up of molecules

b)

ionic compounds contains strong intermolecular forces while covalent compounds contain weak electrostatic forces.

c)

ionic compounds conducts electricity when solid state while covalent compounds cannot conduct electricity.

d)

ionic compounds transfer electrons while covalent compounds share electrons.

49.

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

a)

Crystallisation

b)

Distillation

c)

Evaporation

d)

All of the above

50.

Name the separation technique

a)

Centrifuge

b)

Crystallisation

c)

Distillation

d)

Evaporation

51.

Name the separation technique

a)

Distillation

b)

Crystallisation

c)

Evaporation

d)

Condensation

52.

Name the separation technique

a)

Filtration

b)

Evaporation

c)

Centrifugation

d)

Distillation

53.

Name the separation technique

a)

Filtration

b)

Evaporation

c)

Distillation

d)

Separation

54.

True or false: Magnets can be used to separate iron filings from sand

a)

True

b)

False

55.

In a salt water solution ...

a)

Salt is the solute and water is the solvent

b)

Salt is the solvent and water is the solute

56.

True or false: Sieving can be used to separate a mixture with two solid components of different sizes

a)

True

b)

False

57.

True or false: Decanting is a technique that can be used to separate a salt water solution

a)

True

b)

False

58.

What is the basis for separating the components of a mixture through distillation?

a)

freezing point of the substances

b)

room temperature

c)

decaying period

d)

boiling point of the substances

59.

The image shows a mixture of concrete nails and saw dusts. What technique is best to use to separate the nails from the saw dusts?

a)

sieving

b)

chromatography

c)

decantation

d)

magnetic separation

60.

Water is the univeral ____.

a)

solute

b)

solvent

c)

solution

61.

solute + solvent =

a)

solution

b)

equation

62.
What is a solute?
a)
The substance that does the dissolving in a solution.
b)
The substance that is dissolved into the solution.
c)
The mixing of different substances.
d)
The process in which neutral molecules lose or gain electrons
63.

Mixture of sugar and hot water.

a)

Homogeneous

b)

Heterogeneous

64.
a)

Homogeneous

b)

Heterogeneous

65.
a)

Homogeneous

b)

Heterogeneous

66.

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

a)

Crystallisation

b)

Distillation

c)

Evaporation

d)

All of the above

67.

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

a)

Filtration

b)

Chromatography

c)

Magnetic separation

d)

Seiving

68.

Name the separation technique

a)

Centrifuge

b)

Bunsen burner

c)

Distillation

d)

Evaporation

69.

Name the separation technique

a)

Distillation

b)

Crystallisation

c)

Magnetic Separation

d)

Condensation

70.

Name the separation technique

a)

Filtration

b)

Evaporation

c)

Centrifuge

d)

Distillation

71.

Name the separation technique

a)

Filtration

b)

Evaporation

c)

Distillation

d)

Separation

72.

True or false: Magnets can be used to separate iron filings from sand

a)

True

b)

False

73.

True or false: Filtration can be used to separate substances in a solution

a)

True

b)

False

74.

In a salt water solution ...

a)

Salt is the solute and water is the solvent

b)

Salt is the solvent and water is the solute

75.

Name the separation technique

a)

Distillation

b)

Filtration

c)

Sieving

d)

Crystallisation

76.

True or false: Sieving can be used to separate a mixture with two solid components of different sizes

a)

True

b)

False

77.

True or false: Decanting is a technique that can be used to separate a salt water solution

a)

True

b)

False

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