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Atoms, molecules and compounds

Total questions: 42

Worksheet time: 21mins

Name
Class
Date
1.

What is a molecule?

a)

two elements bonded together (sharing electrons)

b)

a mixture of different substances

c)

smallest individual particles

d)

salt mixed in water

2.

What is a compound?

a)

Two different elements bonded together.

b)

Two of the same elements bonded together.

c)

A mixture of different substances.

d)

Two substances stuck together with glue.

3.

What two subatomic particles are found in the nucleus?

a)

proton and electron

b)

electron and neutron

c)

neutron and proton

d)

neutron and electron

4.

Which of the following is a chemical formula?

a)

H2SO4

b)

Si

c)

Hg

d)

C

5.

Which of the following is a chemical symbol?

a)

H2O

b)

O

c)

NaCl

d)

FeO

6.

What is an ion?

a)

a charged atom

b)

an atom with different neutrons

c)

atoms with no protons

d)

atoms with no electrons

7.

Where are electrons found?

a)

the nucleus

b)

next to the neutrons

c)

the proton

d)

orbiting the nucleus

8.

How would O2 be qualified?

Check all answers that apply.

a)

Atom

b)

Molecule

c)

Compound

9.
How many total atoms are there in 2HNO3?
a)
2
b)
6
c)
8
d)
10
10.
Explain the difference between an atom and a molecule.
a)
One molecule is made of one atom.
b)
One molecule is always made of different particles.
c)
One molecule is made of more than one atom.
d)
One molecule is made of more than two atoms.
11.
Elements are made of 
a)
many types of atoms 
b)
the periodic table
c)
one type of atom 
d)
molecules 
12.
What are the 3 particles that make-up the atom?
a)
protons, neutrons, and isotopes
b)
neutrons, isotopes, and electrons
c)
positives, negatives, and electrons
d)
protons, neutrons, and electrons
13.
What is the total number of atoms in an ammonia (NH3) molecule?
a)
1
b)
2
c)
3
d)
4
14.
Carbon dioxide (CO2) contains how many atoms of oxygen?
a)
0
b)
1
c)
2
d)
3
15.
What is this?
a)
Compound
b)
Element
c)
Mixture of elements
d)
Mixture of compounds
16.
What are these?
a)
Molecules
b)
Compounds
17.

___________ combine together to form molecules.

a)

atoms

b)

compounds

c)

mixtures

d)

pikmon

18.
Which is the most important characteristic in determining an element's chemical properties?
a)
the number of protons and neutrons in its nucleus
b)
which period it is found in
c)
the number of valence electrons it contains
d)
its outermost energy level
19.

Metals form cations.

a)

True

b)

False

20.

Which of the following is a characteristic property of ionic compounds? (3 correct answers)

a)

They form hard, brittle crystals with characteristic shapes,

b)

They have low melting points

c)

They conduct electricity

d)

They contain no charged particles

e)

They contain charged particles

21.

How many atoms are there in Na2CO3?

a)

4

b)

5

c)

7

d)

6

22.

An element X has 7 electrons in the outermost shell and forms ion with symbol

a)

X-

b)

X-2

c)

X-5

d)

X-3

23.

WHCH OF THE FOLLOWING IS NOT CORRECTLY MATCHED

1. PHOSPHATE -PO43-

2. NO3- NITRIDE

3. SO42- SULPHATE

4. HYDRIDE - H-

a)

1

b)

4

c)

2

d)

3

24.

Which of the following is not a compound?

a)

HCl

b)

Cl2

c)

NaCl

d)

CO2

25.

This picture represents which of the following?

a)

molecular element

b)

molecular compound

c)

mixture

26.

This picture represents which of the following?

a)

molecular element

b)

molecular compound

c)

element

27.
What do these isotopes of carbon all have in common?
a)
neutrons & mass number
b)
atomic number and neutrons
c)
atomic number and electrons
d)
protons, atomic number, and mass number
28.

Isotopes are atoms of the same element with different #’s of __________ & therefore different __________.

a)

neutrons ; atomic numbers

b)

protons ; atomic numbers

c)

electrons ; mass numbers

d)

neutrons ; mass number

29.
Two isotopes of carbon are carbon-12 and carbon-14.  These isotopes differ from one another by two protons.
a)
true
b)
false
30.
How many protons does this isotope of titanium have?
a)
48
b)
22
c)
26
d)
70
31.

The photo above shows the isotopic notation for which isotope?

a)

Carbon 12

b)

Carbon 13

c)

Carbon 14

d)

Carbon 15

32.
An element is defined by its number of 
a)
protons
b)
electrons
c)
neutrons
d)
protons + electrons
33.
Which of the subatomic particles is the lightest
a)
all have the same mass
b)
protons 
c)
neutrons 
d)
electrons
34.
Most of an atom's mass is found in the
a)
electrons.
b)
nucleus.
35.
In a stable atom the amount of electrons is electron is equal to
a)
neutrons
b)
protons
c)
atomic mass
d)
neutrons + protons
36.

What is the total number of oxygen atoms in Ca3(PO4)2?

a)

2

b)

4

c)

6

d)

8

e)

40

37.

Na2CO3 represents

a)

Sodium bicarbonate

b)

Sodium carbonate

c)

Sodium Chloride

d)

Calcium Carbonate

38.

Chemical Formula used for Aluminium oxide is

a)

AlO

b)

Al2O3

c)

AlO4

d)

AlO2

39.

The sum of the charges in an ionic compound should equal

a)

zero 0

b)

eachother

c)

2

40.

If the calcium ion is Ca2+, and calcium nitride is Ca3N2, then what is the charge on the nitride ion?

a)

2-

b)

3-

c)

3+

d)

none of these

41.
K +  and  N-3
a)
KN
b)
KN3
c)
K3N3
d)
K3N
42.
Na +  and  S -2
a)
Na2S
b)
NaS2
c)
Na2S2
d)
NaS

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