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Chemical Equations

Total questions: 70

Worksheet time: 2hrs 10mins

Name
Class
Date
1.
Which of the following is evidence that a chemical change has taken place? 
a)
change in color
b)
change in size
c)
change in shape
d)
change in energy
2.
How many oxygen atoms are present in the following? 
4Ca(OH)2
a)
4
b)
6
c)
8
d)
1
3.
Which of the following can be broken apart in a chemical reaction? 
a)
Noble gases
b)
Molecules and compounds
c)
only molecules
d)
only compounds 
4.
 Fill in the blank to balance the chemical equation. 
2KI  +  ____Cl2 →  2KCl  +  I2
a)
1
b)
2
c)
3
d)
4
5.
What coefficient should go in the blank space to balance the chemical equation? 
2Al  +____  HCl   →    2AlCl3  +  3H2
a)
2
b)
4
c)
3
d)
6
6.

What state of matter is this substance?

a)

solid

b)

liquid

c)

gas

d)

aqueous

7.

Identify the number in blue.

a)

Product

b)

Reactant

c)

Coefficient

d)

Subscript

8.
The substances listed on the left side of a chemical equation are the
a)
Products
b)
Coefficients
c)
Precipitates
d)
Reactants
9.
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.
10.
Which of the following shows the correct way to balance the chemical equation?
Fe + O2 -> Fe2O3
a)
4Fe + 3O2 -> 2Fe2O3
b)
2 Fe + 3O2 -> Fe2O6
c)
4 Fe + O6 -> 2Fe2O3
d)
None of the options are correctly balanced.
11.
How many HCl molecules do you need to balance this equation? 
Mg +  __HCl --->  MgCl2 + H2
a)
1
b)
2
c)
3
d)
4
12.
Balance this equation.
_CH4 + _O2 --> _CO2 + _H2O
a)
1,2,1,1
b)
2,1,2,1
c)
1,2,1,2
d)
0,2,0,2
13.
Balance this equation
_Al +_HCl --> _H2 +_AlCl3
a)
2, 6, 3, 2
b)
it is already balanced
c)
4, 12, 3, 4
d)
2, 1, 4, 5
14.
Which one is a compound?
a)
Co
b)
Br
c)
Fe
d)
CO
15.

How many molecules of KNO3 are shown?

a)

1

b)

2

c)

3

d)

4

16.
What is the little number after an element in a chemical equation called.
Example: H2
a)
Coefficient 
b)
Subscript
c)
Atom
d)
Equation
17.
Which problem is balanced?
(Check ALL answers)
a)
PbO2 + 2H2
b)
SO2 + H20 --> H2SO4
c)
2Na + 2H2O --> 2NaOH + H2
18.

Is the equation balanced?: 2H2O + O2 --> 4MgO + 3Fe

a)

yes

b)

no

19.

Is this equation balanced?

a)

Yes

b)

No

20.
Which of the following models best demonstrates a balanced chemical equation?
a)
F
b)
G
c)
H
d)
J
21.

Metal + Oxygen yields __________________________

a)

Metal Oxide + Water

b)

Metal Oxide + Hydrogen

c)

Metal Oxide

d)

Metal Hydroxide + Hydrogen

22.

Acid + Carbonate yields _____________________

a)

Salt + Hydrogen

b)

Salt + Water + Carbon Dioxide

c)

Salt + Water

d)

Salt + Alkali

23.

Acid + Alkali yields _____________________

a)

Salt + Hydrogen

b)

Salt + Water + Carbon Dioxide

c)

Salt + Water

d)

Salt + Alkali

24.

Which Salt is form with the following acid- Hydrochloric Acid

a)

Chloride

b)

Sulfate

c)

Nitrate

25.

What is the chemical formulae for Hydrochloric acid?

a)

H2SO4

b)

HNO3

c)

HCl

26.

What is the chemical formulae for Nitric acid?

a)

H2SO4

b)

HNO3

c)

HCl

27.

What is the word equation for Neutralization?

a)

Acid + Alkali ---> Salt + Water

b)

Acid + Carbonate ---> Salt + Water + Carbon Dioxide

c)

Acid + Alkali ---> Salt + Water + Carbon Dioxide

d)

Acid + Carbonate ---> Salt + Water

28.

Which is a way Salt can be formed?

a)

Acid + Alkali

b)

Neutralization

c)

Metal + Acid

d)

All of the above

29.

A chemical reaction in which a compound is broken down into two or more smaller substances.

a)

Addition

b)

Decomposition

c)

Single Displacement

d)

Double Displacement

30.

A chemical reaction in which ions from TWO compounds in solution exchanges places to produce two new compounds

a)

Addition

b)

Decomposition

c)

Single Displacement

d)

Double Displacement

31.

A chemical reaction that results in large amounts of energy being released along with carbon dioxide and water.

a)

Combustion

b)

Decomposition

c)

Single Displacement

d)

Double Displacement

32.

A chemical reaction in which two or more substances combine to form a new compound.

a)

Addition

b)

Decomposition

c)

Single Displacement

d)

Double Displacement

33.

A principle that states that the total mass of the reactants equals the total mass of the products in a chemical reaction.

a)

combustion reaction

b)

avogodro's number

c)

mole

d)

Law of conservation of mass

34.

This is the number of atoms or molecules in a mole of any substance and it is also equal to 6.02 x 1023

a)

Avogadro's number

b)

Coefficients

c)

Bill Nye's Underpants

d)

Armageddon

35.

What do the lower letters of (s), (aq), and (g) stand for in equations?

a)

sand, aquarium, grape

b)

solid, aqueous, gas

c)

sausage, acquaintance, giraffe

36.

Find the molar mass of C4H12

(Hint: Use the periodic table and add them) The timer is set for 15 minutes. You have lots of time.

a)

48 grams

b)

60 grams

c)

35 grams

d)

16 grams

37.

Find the molar mass of MgSO4

(Hint: Use the periodic table and add them) The timer is set for 15 minutes. You have lots of time.

a)

120 grams

b)

72 grams

c)

60 grams

d)

92 grams

38.

What type of equation is this?


KClO3 → KCl + O2

a)

Addition

b)

Decomposition

c)

Single Displacement

d)

Double Displacement

39.

What type of equation is this?


H2O + Fe → Fe2O3 + H2

a)

Addition

b)

Decomposition

c)

Single Displacement

d)

Double Displacement

40.

What type of equation is this?


2Na + Br2 → 2NaBr

a)

Addition

b)

Decomposition

c)

Single Displacement

d)

Double Displacement

41.

How are chemical bonds formed?

a)

Atoms duplicate themselves

b)

Electrons move from one atom to another

c)

The number of protons and electrons in an element is changed

d)

Through changes in an atom's nucleus

42.

These are all models of the same molecule. What would this molecule look like in a chemical/molecular formula?

a)

CH

b)

C4H

c)

CH4

d)

4CH

43.

Bacteria in milk causes it to curdle over time. What type of change is this?

a)

Chemical

b)

Physical

c)

Both

d)

Neither

44.

Which type of reaction pulls in thermal energy from the environment around it?

a)

Endothermic

b)

Exothermic

45.

The y-axis shows the energy that is being stored/released during the reaction. What type of reaction is this?

a)

Exothermic

b)

Endothermic

46.

Which of the following type of chemical reaction builds larger compounds from smaller ones?

a)

Synthesis

b)

Combustion

c)

Decomposition

d)

Exothermic

47.
Magnesium can be burned in air to produce solid magnesium oxide.
a)
2Mg(s) + O2(g)→ 2MgO(s)
b)
Mg(s) + O(g) → MgO(s)
c)
2Mg(s) + CO2(g) → 2MgO(s) + C(s)
d)
2Mg(s) + O2(g) → Mg2O2(s)
48.
When hydrogen reacts with sulfur, a smelly gas is produced:
a)
H2(g) + 2S(s) → 2HS
b)
H2(g) + S(s) → H2S(g)
c)
H(g) + S(s) → HS(g)
d)
2H(g) + S(s) → H2S(g)
49.
What is the TYPE of reaction when a metal reacts with oxygen
a)
displacement
b)
precipitation
c)
reduction
d)
oxidation
50.

A teacher asks her students to examine titles of four scientific articles. Which titled article is specifically about a chemical change?

a)

How Baking Soda Reacts with Vinegar

b)

How Rust Can Be Scraped off of Metal

c)

How Metals Respond to Electrical Currents

d)

How Elements Can Change Phase When Heated

51.

A chemistry teacher combines 20 grams of lemon juice with 25 grams of baking soda in a flask covered with a balloon. The flask and balloon have a combined mass of 105 grams. What is the mass of the entire setup after a reaction has occurred?

a)

45 g

b)

150 g

c)

605 g

52.

Which best explains why the total mass of the product(s) would be less than the total weight of the reactant(s) after a chemical reaction?

a)

A physical change occurred.

b)

Atoms involved in the reaction lost mass

c)

Precipitates were created in the new solution

d)

Gases were released into the atmosphere.

53.

An ice cube is put into a heated pan. What will most likely happen to the molecules in the ice as the ice is heated?

a)

The molecules will begin to move slower.

b)

The molecules will begin to move faster.

c)

The molecules will begin to increase in density.

d)

The molecules will begin to condense in air.

54.

Two clear solutions are mixed together in a beaker. Which result would indicate a chemical reaction had occurred between these solutions?

a)

increase of volume in the beaker

b)

decrease of volume in the beaker

c)

increase in temperature of the beaker

55.

A solid produced by a chemical reaction.

a)

slush

b)

gel

c)

aqueous solution

d)

precipitate

56.

This symbol indicates_____________

a)

reacts to yield

b)

beware of sharp edges

c)

a reversible reaction

d)

reactivity increases with items to

57.

This symbol indicates ______________________.

a)

heat is required for the reaction.

b)

the reaction releases heat.

c)

the reaction involves multiple steps

d)

the reaction is a single step reaction

58.

Which of the following elements are NOT diatomic?

a)

Oxygen

b)

Chlorine

c)

Argon

d)

Hydrogen

59.

Lime water turns to milky and a black solid is formed. Which of the following equations correctly represents the reaction?

a)
b)
c)
d)
60.

A chemical reaction is represented by the following equation.


If 12 g of magnesium powder is reacted completely with hydrochloric acid, calculate the mass of magnesium chloride formed.

[ Relative atomic mass : Mg, 24 ; Cl, 35.5 ]

a)

95 g

b)

59.5 g

c)

47.5 g

d)

29.75 g

61.
Which is the correct atom count for the reactant side of the chemical equation?
CH4 + 2 O2 -> CO2 + 2 H2O
a)
C=4
H=4
O=4
b)
C=1
H=4
O=2
c)
C=1
H=4
O=2
d)
C=1
H=4
O=4
62.
How are chemical bonds formed?
a)
by sharing, giving, or taking electrons from another atom
b)
through radioactive decay
c)
by losing or gaining neutrons in the nucleus
d)
by exchanging protons with another atom
63.
Which is true about the chemical equation for photosynthesis?
a)
carbon dioxide is produced
b)
oxygen gas is a reactant
c)
there are more atoms on the product side than the reactant side
d)
proves the Law of Conservation of Mass
64.
Ionic bonds are between...
a)
Metal and Non-metal
b)
Non-metal and Non-metal
c)
Metal and Metal
65.
What is a valence electron?
a)
The sum of neutrons and protons.
b)
The # of electrons in the last shell.
c)
A type of bond.
d)
A popular compound.
66.
Covalent bonds are between...
a)
Metal and Non-metal
b)
Non-metal and Non-metal
c)
Metal and Metal
67.
Atoms are most stable when their outer shell is complete.
a)
true
b)
false
68.
How are ionic bonds formed?
a)
Transfer of electrons
b)
Sharing of electrons
69.
Where are metals located on the periodic table?
a)
Blue
b)
Green
c)
Red
70.
Which of these is covalent?
a)
NaCl
b)
Pb(NO3)2
c)
CO2
d)
AlCl3

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