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Science - Properties of materials Grade 9, Chemistry

Total questions: 62

Worksheet time: 52mins

Name
Class
Date
1.

Which is positively (+) charged?

a)

protons

b)

neutrons

c)

electrons

d)

nucleus

2.

Which is negatively (-) charged?

a)

protons

b)

neutrons

c)

electrons

d)

nucleus

3.

Which has no charge?

a)

protons

b)

neutrons

c)

electrons

d)

nucleus

4.

Which made or protons and neutrons?

a)

protons

b)

neutrons

c)

electrons

d)

nucleus

5.

Name the positively charged particle in an atom.

(a)  

6.

Name the negatively charged particle in an atom.

(a)  

7.

Name the particle in an atom with no charge.

(a)  

8.

Name the centre of an atom made of protons and neutrons.

(a)  

9.

Which group of the Periodic Table is called the Alkali metals?

a)

Group 1

b)

Group 2

c)

Group 7

d)

Group 8

10.

Which group of the Periodic Table is called the Noble gases?

a)

Group 1

b)

Group 2

c)

Group 7

d)

Group 8

11.

Which group of the Periodic Table is called the Halogens?

a)

Group 1

b)

Group 2

c)

Group 7

d)

Group 8

12.

Atomic number = ???

a)

number of protons

b)

number of neutrons

c)

number of protons + neutrons

13.

Mass number = ???

a)

number of protons

b)

number of neutrons

c)

number of protons + neutrons

14.

Number of protons + number of neutrons = ???

(a)  

15.

Number of protons =

(a)  

16.

Number of protons = atomic number = number of ???

(a)  

17.

Choose the giant ionic structure.

a)

water (H2O)

b)

salt (NaCl)

c)

diamond (C)

d)

graphite (C)

18.

Choose the giant covalent structure.

a)

water (H2O)

b)

salt (NaCl)

c)

diamond (C)

d)

graphite (C)

19.

Ionic compounds have/are...

a)

high melting and boiling points

b)

shared electrons

c)

non-metal + non-metal

d)

solids, liquids and gases

20.

Ionic compounds have/are...

a)

low melting and boiling points

b)

lost/gained (transferred) electrons

c)

non-metal + non-metal

d)

solids, liquids and gases

21.

Ionic compounds have/are...

a)

low melting and boiling points

b)

shared electrons

c)

metal + non-metal

d)

solids, liquids and gases

22.

Ionic compounds have/are...

a)

low melting and boiling points

b)

shared electrons

c)

non-metal + non-metal

d)

crystalline solids

23.

Covalent compounds have/are...

a)

low melting and boiling points

b)

lost/gained (transferred) electrons

c)

metal + non-metal

d)

crystalline solids

24.

Covalent compounds have/are...

a)

high melting and boiling points

b)

shared electrons

c)

metal + non-metal

d)

crystalline solids

25.

Covalent compounds have/are...

a)

high melting and boiling points

b)

lost/gained (transferred) electrons

c)

non-metal + non-metal

d)

crystalline solids

26.

Covalent compounds have/are...

a)

high melting and boiling points

b)

lost/gained (transferred) electrons

c)

metal + non-metal

d)

solids, liquids and gases

27.

Choose the ionic compound

a)

carbon dioxide

b)

hydrochloric acid

c)

sodium chloride

d)

water

28.

Choose the covalent compound

a)

magnesium chloride

b)

hydrochloric acid

c)

sodium chloride

d)

calcium fluoride

29.

Why do elements form compounds? (Choose TWO answers)

a)

To be more stable

b)

To be more reactive

c)

To have full outer electron shells

d)

To have no electrons

30.

Draw a sodium atom. (Atomic number = 11)

31.

Draw a chlorine atom. (Atomic number = 17)

32.

Draw a lithium atom. (Atomic number = 3)

33.

Draw a fluorine atom. (Atomic number = 9)

34.

Draw a potassium atom. (Atomic number = 19)

35.

Moving down Group 1, reactivity...

a)

increases

b)

decreases

c)

stays the same

36.

Moving down Group 1, melting and boiling points...

a)

increase

b)

decrease

c)

stay the same

37.

Moving down Group 7, melting and boiling points...

a)

increase

b)

decrease

c)

stay the same

38.

Moving down Group 7, reactivity...

a)

increases

b)

decreases

c)

stays the same

39.

The first three elements of Group 1 are lithium, sodium and potassium.

Which one is LEAST REACTIVE?

a)

lithium

b)

sodium

c)

potassium

40.

The first three elements of Group 1 are lithium, sodium and potassium.

Which one is MOST REACTIVE?

a)

lithium

b)

sodium

c)

potassium

41.

The first three elements of Group 1 are lithium, sodium and potassium.

Which one has the HIGHEST MASS NUMBER?

a)

lithium

b)

sodium

c)

potassium

42.

The first three elements of Group 1 are lithium, sodium and potassium.

Which one has the LOWEST MASS NUMBER?

a)

lithium

b)

sodium

c)

potassium

43.

The first three elements of Group 7 are fluorine, chlorine and bromine.

Which one has the LOWEST MASS NUMBER?

a)

fluorine

b)

chlorine

c)

bromine

44.

The first three elements of Group 7 are fluorine, chlorine and bromine.

Which one has the HIGHEST MASS NUMBER?

a)

fluorine

b)

chlorine

c)

bromine

45.

The first three elements of Group 7 are fluorine, chlorine and bromine.

Which one is MOST REACTIVE?

a)

fluorine

b)

chlorine

c)

bromine

46.

The first three elements of Group 7 are fluorine, chlorine and bromine.

Which one is LEAST REACTIVE?

a)

fluorine

b)

chlorine

c)

bromine

47.

At the atomic level, what is the main cause for chemical reactions?

(a)  

48.

Chlorine forms a compound with sodium by (a)   an electron.

49.

Sodium forms a compound with chlorine by (a)   an electron.

50.

Hydrogen forms a compound with chlorine by (a)   electrons.

51.

Choose TWO correct sentences about ions.

a)

Have lost or gained an electron

b)

Have no charge

c)

Are more stable than atoms

d)

Are more reactive than atoms

52.

Choose TWO correct sentences about ions.

a)

Have equal numbers of protons and neutrons

b)

Are positively or negatively charged

c)

Are more stable than atoms

d)

Are more reactive than atoms

53.

Why is an ion of sodium more stable than an atom of sodium?

(a)  

54.

Why is an ion of chlorine more stable than an atom of chlorine?

(a)  

55.

A molecule is formed when two ions are attracted to each other.

a)

TRUE

b)

FALSE

56.

A covalent bond is formed when two atoms share a pair of electrons.

a)

TRUE

b)

FALSE

57.

Ionic compounds have HIGHER melting and boiling points than covalent compounds.

a)

TRUE

b)

FALSE

58.

An ion that loses an electron has a negative charge.

a)

TRUE

b)

FALSE

59.

Methane (CH4) and carbon dioxide (CO2) are covalent compounds.

a)

TRUE

b)

FALSE

60.

Sodium chloride and hydrogen chloride are ionic compounds.

a)

TRUE

b)

FALSE

61.

When melted or dissolved in water, ionic compounds are...

(a)  

62.

Covalent compounds do not conduct electricity, except...

(a)  

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