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Chemical Formulas and Equations

Total questions: 50

Worksheet time: 1hrs 22mins

Name
Class
Date
1.
A covalent bond is formed between what kind of atoms?
a)
Non-metal
b)
Metal
2.
True or false, ionic bonding is when a metal reacts with a non-metal?
a)
True
b)
False
3.
Valence electrons are
a)
All the electrons in an atom
b)
The electrons in the outermost shell
4.
Conductivity refers to a materials ability to conduct electricity
a)
False
b)
True
5.

_____________________ bonds have a high melting point.

a)

ionic

b)

covalent

6.

What part of an atom creates a chemical bond?

a)

the protons

b)

the neutrons

c)

all of the electrons

d)

the valence electrons

7.

Each group on the periodic table has the same

a)

number of protons

b)

number of electrons

c)

number of atoms

d)

number of valence electrons

8.

What is the charge of a potassium ion with 19 protons and 18 electrons?

a)

1+

b)

2+

c)

1-

d)

2-

9.

This is a correct dot diagram for nitrogen (N)

a)

true

b)

false

10.

This is a correct dot diagram for neon (Ne)

a)

true

b)

false

11.
This could be the dot diagram of
a)
P
b)
Ar
c)
Na
d)
B
12.
Most elements will gain or lose electrons so that they end up with _______ valence electrons.
a)
2
b)
6
c)
8
d)
10
13.
This could be the dot diagram of 
a)
Ne
b)
Si
c)
Al
d)
Be
14.
When dissolved in water, salt separates into:
a)
hydrogen and hydroxide ions
b)
molecules of sodium and chlorine
c)
ions of sodium and chlorine
d)
molecules of chlorine and ions of sodium
15.
Which compound has the most atoms?
a)
H2O
b)
O2
c)
C3H6O3
d)
NaCl
16.

How many elements are in C6H12O6?

a)

1

b)

2

c)

3

d)

4

17.
How many atoms are there TOTAL in:
H2SO4
a)
6
b)
5
c)
7
d)
3
18.
When trying to identify an unknown element, a scientist determines what other elements the unknown element reacts with chemically. Which property of the unknown element determines the other elements it reacts with?
a)
The total number of neutrons in the unknown element
b)
The total number of particles in the nucleus of the unknown element
c)
The number of protons in the nucleus of the unknown element
d)
The number of valence electrons in the unknown element
19.

Which of these formulas contain equal numbers of nitrogen atoms?

a)

Formulas I and III

b)

Formulas I and IV

c)

Formulas II and III

d)

Formulas I, II, and V

20.
In chemical reactions, what does the principle of conservation of mass mean?
a)
Matter is not created or destroyed.
b)
The total mass of the reactants is greater than the total mass of the products.
c)
The total mass of the reactants is less than the total mass of the products.
d)
Matter is not changed.
21.

How many total atoms are in 2C2HO8Cl2

a)

23

b)

46

c)

3

d)

22

22.
How many O's are in Al₂(SO₄)₃
a)
4
b)
12
c)
7
d)
24
23.
Balance this equation...
HgO --> Hg + O2
a)
It is balanced 
b)
2HgO --> Hg + O2
c)
2HgO --> 2Hg + O2
d)
I don't know...Oh well!
24.
What is the left part of a chemical equation called?
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
25.
What is the right part of a chemical equation called...
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
26.
Is the following equation balanced?
2C2H2 + 5O2 --> 4CO2 + 2H2O
a)
yes
b)
no
27.
This appears on the left side of a chemical formula, and represents how many molecules there are.
a)
an atom
b)
the subscript
c)
a molecule
d)
the coefficient
28.
How many hydrogen atoms are in this chemical formula?
a)
4 hydrogen atoms
b)
1 hydrogen atom
c)
2 hydrogen atoms
d)
3 hydrogen atoms
29.
How many oxygen atoms are in this chemical formula?
a)
7 oxygen atoms
b)
4 oxygen atoms
c)
3 oxygen atoms
d)
1 oxygen atom
30.
How many oxygen atoms are in this chemical formula?
a)
6 oxygen atoms
b)
2 oxygen atoms
c)
3 oxygen atoms
d)
4 oxygen atoms
31.

The total amount of matter (atoms) before and after a chemical reaction remains the same.

a)

True

b)

False

32.

This is used to represent the number of each atom being represented for an element.

a)

an exponent

b)

the coefficient

c)

a molecule

d)

the subscript

33.
How many different elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
34.
Which is the correct formula for 3 hydrogen atoms, one sulfur atom, and four oxygen atoms?
a)
H3SO4
b)
HSO4
c)
H4S3O
d)
H2O
35.
Balance this equation:
__ P4 + __ O2 → __ P2O3
a)
it is already balanced
b)
2, 1, 3
c)
1, 2, 3
d)
1, 3, 2
36.

Is the equation balanced?


Li + Cl2 → 2LiCl

a)

Yes, all elements balanced.

b)

No, Lithium isn't balanced.

c)

No, Chlorine isn't balanced.

37.

Is the equation balanced?


2Li + Cl2 → 2LiCl

a)

Yes, all elements are balanced.

b)

No, Lithium is not balanced.

c)

No, Chlorine is not balanced.

38.

Is this balanced?

C2H4 + 3O2 → 2CO2 + 2H2O

a)

Yes

b)

No, Carbon is not balanced

c)

No, Hydrogen is not balanced

d)

No, Oxygen is not balanced

39.

Is this balanced?

C2H4 + 2O2 → 2CO2 + 2H2O

a)

Yes

b)

No, Carbon is not balanced

c)

No, Hydrogen is not balanced

d)

No, Oxygen is not balanced

40.

Is this balanced?

C2H4 + 2O2 → CO2 + 2H2O

a)

Yes

b)

No, Carbon is not balanced

c)

No, Hydrogen is not balanced

d)

No, Oxygen is not balanced

41.

Is this balanced?

2HgO → 2Hg + 2O2

a)

Yes

b)

No, Hg is not balanced.

c)

No, O is not balanced

42.

What type of chemical reaction is this?


Pb + FeSO4 ----> PbSO4 + Fe

a)

Synthesis (or combination)

b)

Decomposition

c)

Single displacement

d)

Double displacement

43.

What type of chemical reaction is this?


CaCO3 ----> CaO + CO2

a)

Synthesis (or combination)

b)

Decomposition

c)

Single displacement

d)

Double displacement

44.

What type of chemical reaction is this?


P4 + 3 O2 ----> 2 P2O3

a)

Synthesis (or combination)

b)

Decomposition

c)

Single displacement

d)

Double displacement

45.

What type of chemical reaction is this?


2 NO2 ----> 2 O2 + N2

a)

Synthesis (or combination)

b)

Decomposition

c)

Single displacement

d)

Double displacement

46.

What reaction has the following general formula:

AB --> A + B

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

47.

What reaction has the following general formula:

A + CD --> C + AD

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

48.

What reaction has the following general formula:

AB + CD --> CB + AD

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

49.

What reaction has the following general formula:

A + B --> AB

a)

Synthesis (combination)

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

50.

What reaction has the following general formula:
 CxHy + O2 −>CO2 + H2OC_xH_y\ +\ O_2\ ->CO_{2\ }+\ H_2O  

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

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