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Elements and Compounds

Total questions: 38

Worksheet time: 21mins

Name
Class
Date
1.

(a)   is not a compound.

Choose from the below words
HCl
NaCl
Cl
CO2
2.

Salt has a chemical formula of NaCl. Salt is a...

a)

Compound

b)

Mixture

c)

Element

d)

None of the Above

3.

How many elements are represented in the compound?

Na2CO3

a)

1

b)

2

c)

3

d)

4

4.

An element is made up of only one kind of _____.

a)

isotope

b)

atom

c)

plastic

d)

metal

5.

Match the following chemical formulas with their types.

a)

N2

1.

Elemental Nitrogen

b)

Cu

2.

Copper

c)

O2

3.

Elemental Oxygen

d)

H2O2

4.

Hydrogen Peroxide

6.

The atom is the smallest part of (a)  

Choose from the below words
An element
A mixture
A compound
7.

Are there any compounds on the periodic table?

a)

Yes,there are many.

b)

No,because only elements are on the periodic table.

8.

A section of the Periodic Table is shown. What is the Chemical Symbol for Magnesium?

a)

12

b)

Magnesium

c)

24.31

d)

Mg

9.

Both elements and compounds are pure substances.

a)

Agree

b)

Disagree

10.

Located on the Periodic Table

a)

Elements

b)

Compounds

c)

Both

11.
Is sugar (C12H22O11) an element or a compound?
a)
Element
b)
Compound
12.

How many elements are in this compound?

a)

13

b)

6

c)

4

d)

3

13.
Which of the following could be a symbol on he periodic table of elements?
a)
JZ
b)
jz
c)
Jz
d)
JZa
14.
What cannot be broken down into other substances?
a)
Compound
b)
Mixture
c)
Solids
d)
Element
15.
Which of the following an element?
a)
Carbonic Acid
b)
Copper
c)
Iron and Copper
d)
Water
16.

How to separate the jelly beans?

a)

Filtration method

b)

Sieving method

c)

Hand-picking method

d)

Floatation method

17.
Mixtures are always combinations of compounds that are in different states of matter. 
a)
TRUE
b)
FALSE
18.
Which of these is not a mixture? 
a)
oil and water
b)
sand and soda
c)
diet soda
d)
all are mixtures
19.

How many atoms of Hydrogen are in H2O

a)

1

b)

2

c)

3

d)

more than 3

20.

There are (a)   different elements present in H2COCH2

Choose from the below words
5
4
3
2
21.

How many different elements are present in this molecule?

3 NH4C2H3O2

a)

15

b)

36

c)

5

d)

4

22.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
23.

Which element, which is essential for human life, is found in large amounts in both Earth's atmosphere and oceans?

a)

helium

b)

silicon

c)

oxygen

d)

calcium

24.

Look at the data table. Which graph below best represents the most abundant elements in the Earth's crust?

a)
b)
c)
d)
25.

soil, sand, ground, mountains, and ocean floors...

a)

Biosphere

b)

Lithosphere

c)

Atmosphere

d)

Hydrosphere

26.

Earth's water, oceans, rivers, lakes are part of the (a)  

Choose from the below words
Biosphere
Lithosphere
Atmosphere
Hydrosphere
27.

air surrounding Earth...

a)

Biosphere

b)

Lithosphere

c)

Atmosphere

d)

Hydrosphere

28.

animals and plants...

a)

Biosphere

b)

Lithosphere

c)

Atmosphere

d)

Hydrosphere

29.

Which pie chart MOST accurately reflects the information in the table?

a)
b)
c)
d)
30.

The basic building blocks of matter

a)

atoms

b)

elements

c)

molecules

d)

organisms

31.

Each element has a chemical _________ that is made up of one or two letters.

a)

name

b)

number

c)

symbol

d)

mineral

32.

When two or more elements combine chemically, they form _________.

a)

DNA

b)

atoms

c)

molecules

d)

compounds

33.

Which of the following are known as the building blocks of matter?

a)

elements

b)

atoms

c)

protons

d)

none of the above

34.
Question Image

Match the following substances with their chemical formulas.

a)

water

H2 OH_{2\ }O

1.

H2O

b)

hydrogen HH

2.

H

c)

salt NaClNaCl

3.

NaCl

d)

ammonia NH3NH_3

4.

NH3

35.
Question Image

Match the following chemical formulas with the number of different elements they contain:

a)

17

1.

C8H10N4O2C_8H_{10}N_4O_2

b)

5

2.

C7H5NO3SC_7H_5NO_3S

c)

15

3.

C12H22O11C_{12}H_{22}O_{11}

d)

4

4.

H2OH_2O

36.

In the chemical formula below for table salt, what do the capital letters represent?

a)

a chemical formula

b)

compounds

c)

molecules

d)

elements

37.

The chemical formula for ammonia is

NH3NH_3  .  The ratio of nitrogen atoms to hydrogen atoms is (a)  

Choose from the below words
one nitrogen atom to three hydrogen
equal number of nitrogen and hydrog
no nitrogen atoms to three hydrogen
one nitrogen atom to one hydrogen a
38.
Question Image

Match the following items with their corresponding elements.

a)

A

1.

Element A

b)

B

2.

Element B

c)

C

3.

Element C

d)

D

4.

Element D

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