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OPTIONAL: Molecules & Compounds Practice Test

Total questions: 50

Worksheet time: 27mins

Name
Class
Date
1.

Atoms bond together in different ways to make ________________.

a)

Substances

b)

Matter

c)

Molecules

2.
This picture represents which of the following?
a)
element
b)
compound
c)
mixture
3.
What is the term for combining 2 or more atoms together?
a)
atoms
b)
elements
c)
molecules
d)
compounds
4.
Are these molecules also compounds?
a)
YES
b)
NO
5.
Are these molecules also compounds?
a)
YES
b)
NO
6.
How many carbon atoms are there in a methane molecule? 
a)
0
b)
1
c)
4
d)
5
7.
Carbon dioxide (CO2) contains how many atoms of oxygen?
a)
0
b)
1
c)
2
d)
3
8.

Which of the following cannot be broken down into something simpler?

a)

a compound

b)

an element

c)

a chemical formula

d)

a mixture

9.
What is the basic unit of matter and is the smallest particle of an element?
a)
Atoms
b)
Elements
c)
Compounds
d)
Molecules
10.

Which of the following is not a compound?

a)

HCl

b)

Cl2

c)

NaCl

d)

CO2

11.

What charge does an atom have when it GAINS electrons?

a)

Positive

b)

Negative

c)

Neutral

12.
Sodium has an atomic number of 11, how many protons does this atom have?
a)
22
b)
11
c)
12
d)
2
13.

What is the picture displayed?

a)

atom

b)

element

c)

compound

14.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
15.
What term is used for the joining of atoms to form new substances?
a)
valence electrons
b)
physical bonding
c)
energy level
d)
chemical bonding
16.

How would H2O be classified? Check all that apply.

a)

Atom

b)

Molecule

c)

Compound

17.

How would O2 be qualified. Check all answers that apply.

a)

Atom

b)

Molecule

c)

Compound

18.

How many valence electrons are in the element Carbon?

a)

2 electrons

b)

6 electrons

c)

4 electrons

d)

None of the above

19.

Are these molecules also compounds?

a)

YES

b)

NO

20.
Elements are made of 
a)
many types of atoms 
b)
the periodic table
c)
one type of atom 
d)
molecules 
21.
What is the basic unit of matter and is the smallest particle of an element?
a)
Atoms
b)
Elements
c)
Compounds
d)
Molecules
22.
Two or more atoms chemically bonded together are called a
a)
atom
b)
element
c)
molecule
d)
mixture
23.
A molecule is made up of ____ or more atoms.
a)
1
b)
2
c)
3
d)
4
24.

The image shows the elemental block of potassium. How many electrons are found in the potassium atom?

a)

19

b)

20

c)

39

d)

40

25.

Which part of an atom is represented by the blue circles?

a)

electrons

b)

neutrons

c)

protons

26.

made up of atoms of two or more different elements joined together by chemical bonds

a)

molecule

b)

element

c)

atom

d)

compound

27.

Why do all bonds form?

a)

To fill up the outer shell.

b)

To achieve the one or duplet electronic configuration

28.

An atom with 1 valence electron 'needs' a full shell, so it can either gain 7 electrons or lose 1. Which is more likely to occur?

a)

lose 1 electron

b)

gain 7 electrons

29.

What two types of atoms make a covalent bond?

a)

metal atom and metal atom

b)

metal atom and non metal non atom

c)

non metal atom and non metal atom

30.

When an atom loses an electron, it becomes a _________.

a)

noble gas

b)

anion

c)

cation

31.

Atoms are most stable when their outer shell is full or complete.

a)

True

b)

False

32.

What part of an atom is involved in chemical bonding?

a)

proton

b)

neutron

c)

electron

33.

How many valence electrons does hydrogen have?

a)

1

b)

2

c)

3

d)

4

34.

The vertical (up and down) columns in the Periodic Table are called

a)

groups

b)

towers

c)

periods

d)

atomic numbers

35.

All of the elements in a period have the same number of _____.

a)

energy levels

b)

valence electrons

c)

protons

d)

electrons

36.

All of the elements in a group have the same number of _____.

a)

energy levels

b)

valence electrons

c)

protons

d)

electrons

37.

How many electrons can the first energy level hold?

a)

1

b)

2

c)

8

d)

Unlimited

38.

How many electrons can the second and third (for our intents and purposes) energy levels hold?

a)

1

b)

2

c)

8

d)

Unlimited

39.

How many valence electrons does Silicon Have?

a)

1 Valence electron

b)

2 Valence electron

c)

3 Valence electron

d)

4 Valence electron

e)

5 Valence electron

40.

How many valence electrons does Oxygen Have?

a)

4 Valence electron

b)

5 Valence electron

c)

6 Valence electron

d)

7 Valence electron

e)

8 Valence electron

41.

Which is the correct lewis dot diagram for oxygen (O)

a)

true

b)

false

42.

Which is the correct Bohr model for Nitrogen (N)

a)

true

b)

false

43.
An atom becomes _______ when it loses electrons.
a)
Positive
b)
Negative
c)
Neutral
d)
Invinsible
44.
An atom becomes _________ when it gains electrons.
a)
Positive
b)
Negative
c)
Neutral
d)
Invinsible
45.
Valence electrons are: 
a)
Electrons farthest away from the nucleus
b)
Electrons closest to the nucleus
c)
Electrons that just come and go - they don't stay with the atom
46.

Calculate the number of Oxygen atoms in Al(OH)3

a)

1

b)

2

c)

3

d)

4

47.

How many total POTASSIUM atoms are in this formula?

a)

8

b)

2

c)

4

d)

12

48.

C3H5(NO3)3

a)

C = 3, H = 5, N = 3, O = 9

b)

C = 3, H = 5, N = 1, O = 9

c)

C = 9, H = 15, N = 3, O = 9

d)

C = 9, H = 15, N = 1, O = 3

49.

How many atoms of each element is represented in one molecule of 2-heptane?

CH3C4H8COCH3

a)

4 Carbon

11 Hydrogen

1 Oxygen

b)

7 Carbon

14 Hydrogen

1 Oxygen

c)

7 Carbon

11 Hydrogen

8 Oxygen

d)

6 Carbon

14 Hydrogen

3 Oxygen

50.

#7

Which TWO substances have the same number of carbon atoms?

a)

C2H6OC_2H_6O  

b)

C8H18C_8H_{18}  

c)

CH3CH2BrCH_3CH_2Br  

d)

C4H10OC_4H_{10}O  

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