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Compounds

Total questions: 25

Worksheet time: 25mins

Name
Class
Date
1.

What does this pic illustrate?

a)

Element

b)

Mixture of Compunds

c)

Mixture of elemets

d)

Compounds

2.

Are these molecules also compounds?

a)

YES

b)

NO

3.

Propane is a....

a)

Element

b)

Compound

c)

Mixture

4.

How are compounds formed from elements?

a)

By mixing elements physically

b)

By chemically combining elements

c)

By heating elements

d)

By cooling elements

5.

Which of the following is a compound?

a)

zinc (Zn)

b)

magnesium (Mg)

c)

sodium chloride (NaCl)

d)

potassium (K)

6.

How many atoms of Hydrogen are in this compound?

a)

1

b)

2

c)

3

d)

4

7.

This picture represents which of the following?

a)

element

b)

compound

8.

What is the molecular structure of table salt?

a)

Sandwich

b)

Molecular who?

c)

H2O

d)

NaCl

9.

What is the chemical formula for water?

a)

H2OH_2O

b)

CO2CO_2

c)

O2O_2

d)

H2SO4H_2SO_4

10.

Which of the following is an example of a compound?

a)

Oxygen

b)

Water

c)

Hydrogen

d)

Nitrogen

11.

What is the main difference between a compound and a mixture?

a)

Compounds are chemically combined, mixtures are physically combined

b)

Compounds are always solids, mixtures are always liquids

c)

Compounds can be separated by physical means, mixtures cannot

d)

Compounds are made of elements, mixtures are made of compounds

12.

What is the chemical formula for carbon dioxide?

a)

COCO

b)

CO2CO_2

c)

C2OC_2O

d)

C2O2C_2O_2

13.

This picture represents which of the following?

a)

element

b)

compound

14.
a)
Element
b)
Compound
c)
Mixture of compound and element
d)
Mixture of two elements
15.

Which example is a compound?

a)

N2

b)

O2

c)

Cu

d)

H2O2

16.

Is sugar (C12H22O11) an element or a compound?

a)

Element

b)

Compound

17.

diagram "a" is an example of a(n)

a)

element

b)

compound

c)

mixture

18.

Water (H2O), is not found on the periodic table because water is a...

a)

atom

b)

liquid

c)

mixture

d)

compound

19.

What does this illustrate

a)

Elements

b)

Compunds

c)

Mixture of Elements and Compunds

d)

Mixture of Compounds

20.

This diagram represents...

a)

An element

b)

A molecule

c)

A compound

d)

A mixture of elements and compounds

21.

Which of the following is a characteristic of a compound?

a)

It can be separated into its elements by physical means

b)

It has a fixed composition

c)

It is always a liquid

d)

It is a pure element

22.

What is the chemical formula for table salt?

a)

NaClNaCl

b)

KClKCl

c)

CaCl2CaCl_2

d)

MgCl2MgCl_2

23.

Which of the following processes can be used to separate a compound into its elements?

a)

Filtration

b)

Distillation

c)

Electrolysis

d)

Magnetism

24.

Which of the following is an example of a compound used in everyday life?

a)

Oxygen

b)

Water

c)

Iron

d)

Gold

25.

What happens to the properties of elements when they form a compound?

a)

They remain the same

b)

They change completely

c)

They become more metallic

d)

They become less reactive

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