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Chemistry: Chemical Formulas

Total questions: 47

Worksheet time: 33mins

Name
Class
Date
1.

What does the subscript in a chemical formula tell you?

a)

How many molecules are present

b)

How many atoms are present

c)

How many elements are present

d)

How many neutrons are present

2.

What is the correct chemical formula for the compound pictured?

a)

H2

b)

H2O

c)

O2

d)

H2O2

3.

Lists the "ingredients" of a molecule or compound-- the chemical symbols and numbers of atoms present.

a)

chemical symbol

b)

coefficient

c)

subscript

d)

chemical formula

4.

The basic unit of an element is called ___

a)

atom

b)

element

c)

proton

d)

product

5.

____ is a substance that can't be broken down. It's made of one kind of atom.

a)

atom

b)

element

c)

mixture

d)

product

6.

Which of the models best represents CaCO3?

a)
b)
c)
d)
7.

What molecule is shown?

a)

CO2

b)

NH4

c)

H2O

d)

O2H

8.

What molecule is shown?

a)

NH4

b)

N1H4

c)

N1H3

d)

NH3

9.

Which formulas below have coefficients of 4? Check all that apply.

a)

4CO24CO_2

b)

4CH44CH_4

c)

4H2O24H_2O_2

d)

4Br34Br_3

10.

Which chemical formula below matches the image shown here?

a)

2H2O2H_2O

b)

H4O2H_4O_2

c)

4H2O4H2O

d)

2HO2HO

11.

Which chemical formula below matches the image shown here?

a)

2H2O2H_2O

b)

H2O2H_2O_2

c)

4H2O4H2O

d)

2HO2HO

12.

3H2O3H_2O  

Which image below matches this chemical formula?

a)
b)
c)
d)
13.

Which image below could represent this formula?

  2NaCl2NaCl  

a)
b)
c)
d)
14.
According to the octet rule most elements need _______ valence electrons.
a)
2
b)
8
c)
6
d)
18
15.

This is a Bohr Diagram of Aluminum. How many valence electrons does Aluminum have?

a)

3

b)

4

c)

5

16.

How many valence electrons does Tin (Sn) have?

a)

8

b)

7

c)

5

d)

4

17.

How many valence electrons does Lithium (Li) have?

a)

8

b)

1

c)

5

d)

2

18.

How many valence electrons does Bromine (Br) have?

a)

5

b)

6

c)

7

d)

8

19.
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
d)
Electrons in the second shell
20.

How many electrons can the first shell hold?

a)

2

b)

4

c)

6

d)

8

21.
Which of the following has a full valence shell?
a)
Oxygen
b)
Neon
c)
Barium
d)
Carbon
22.
What is a valence electron?
a)
an electron that is found in the outermost shell of an atom. 
b)
an electron found in the innermost shell of an atom.
c)
an electron found in the middle shell.
23.

According to the diagram below, how many bonds will this atom be able to make?

a)
1
b)
2
c)
3
d)
4
24.

This is a correct dot diagram for neon (Ne)

a)

true

b)

false

25.

Which of these is incorrect?

a)
b)
26.
Most elements will gain or lose electrons so that they end up with _______ valence electrons.
a)
2
b)
6
c)
8
d)
10
27.

Which of these is correct?

a)
b)
c)
28.
This could be the dot diagram of 
a)
Ne
b)
Si
c)
Al
d)
Be
29.

Why do all bonds form?

a)

to fill the outermost energy level

b)

so an atom can be unstable

c)

so the number of protons and electrons can equal.

d)

so they can gain neutrons.

30.

Valence electrons are found

a)

outermost energy level

b)

innermost energy level

c)

some where in the electron cloud

31.

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)

nothing

b)

gain 7

c)

lose 1

32.

How do covalent bonds form?

a)

by sharing electrons between atoms

b)

by donating or receiving electrons

33.

What two types of atoms make a covalent bond?

a)

2 nonmetals

b)

2 metals

c)

1 metal and 1 nonmetal`

34.

How many valence electrons does Boron have?

a)

1

b)

2

c)

3

d)

4

35.

When an atom loses an electron, it becomes a

a)

positive ion

b)

negative ion

36.

Ionic bonds are between

a)

metals and nonmetals

b)

2 metals

c)

2 nonmetals

37.

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

a)

true

b)

false

38.

How are ionic bonds formed?

a)

transfer of electrons

b)

sharing of electrons

39.

Group numbers on the periodic table help us determine

a)

number of valence electrons

b)

state of the element (solid, liquid, gas)

40.

Water is an example of what?

a)

molecular compound (covalent compound)

b)

ionic compound

41.

Salt is an example of what?

a)

ionic compound

b)

covalent compound

42.

Atoms involved in a covalent bond are not charged, while atoms involved in an ionic bond are charged (negative or positive)

a)

true

b)

false

43.
Ionic bonds form between metals and ____.
a)
metalloids
b)
metals
c)
nonmetals
44.
What two types of atoms make a covalent bond?
a)
2 Nonmetals
b)
1 Nonmetal and 1 Metal
c)
2 Metals
d)
2 Noble Gases
45.

If an atom has no charge, which of the following must be true?

a)

It has more neutrons than protons or electrons.

b)

There are only neutrons inside the atom.

c)

Its number of protons is equal to its number of electrons.

d)

The neutrons in the atom outnumber the electrons and protons.

46.

Why don't noble gases form bonds?

a)

Noble gases do form bonds

b)

They all have a full octet

c)

They only bond with each other

47.

What charge will a Neon ion have?

a)

+1

b)

-1

c)

-8

d)

Neon does not form ions.

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