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Unit 4: Chemical Reactions

Total questions: 35

Worksheet time: 2hrs 13mins

Name
Class
Date
1.

In a reaction A + B --> C, there are 5g of reactant A and product C has a mass of 9g. How many grams of reactant B have to be present?

a)

4g

b)

5g

c)

9g

d)

14g

2.

The number in front of a compound or element is a?

a)

Subscript

b)

Coefficient

c)

Superscript

d)

Charge

3.

The number to the lower, right side of an element is a?

a)

Subscript

b)

Superscript

c)

Coefficient

d)

Charge

4.

Which Chemical Equation is Balanced?

a)

CH₄+O₂------CO₂+2H₂O

b)

H₂+O₂-----2H₂O₄

c)

4Al+3O₂-----2Al₂O₃

5.
Which of the following is an example that includes evidence of a chemical reaction?
a)
A sample of zinc is placed in water and it settles to the bottom
b)
A solid block of ice is heated and it completely melts into a liquid. 
c)
Sugar that is burned gives off an odor and turns brown and then black.
d)
A tomato is placed into a blender and chopped up into smaller pieces.
6.
Which of the following is NOT evidence that that a chemical reaction has occurred?
a)
produces light/heat
b)
production of a gas
c)
formation of a precipitate
d)
melting
7.

Identify the reaction type: H2O2 --> H2O + O2

a)

decomposition

b)

synthesis

c)

single replacement

d)

double replacement

8.

Identify the reaction type: Fe + O2 ---> Fe2O3

a)

decomposition

b)

combustion

c)

synthesis

d)

single replacement

9.

Identify the reaction type: Al + CuCl2 ----> Cu + AlCl3

a)

combustion

b)

synthesis

c)

double replacement

d)

single replacement

10.

Identify the reaction type: AgNO3 + NaCl ---> AgCl + NaNO3

a)

double replacement

b)

single replacement

c)

combustion

d)

decompostion

11.

Identify the reaction type: C3H8 + O2 ---> CO2 + H2O

a)

single replacement

b)

double replacement

c)

combustion

d)

decomposition

12.

Predict the products of this single displacement reaction:

Mg+ AgNO3-->

a)

Mg(NO3)2 + Ag

b)

MgNO3 + Ag

c)

MgAg + NO3

d)

Mg+ AgNO3

13.

Predict the products of this single displacement reaction:

K + HCl -->

a)

KCl + H2

b)

KHCl

c)

KH + Cl2

d)

KCl + H

14.

Predict the products of this reaction:

AgNO3 + KCl -->

a)

AgCl + KNO3

b)

AgK + ClNO3

c)

AgNO3 + KCl

d)

KAg + NO3Cl

15.

In the equation, Mg + O2 ---> MgO, what are the reactants?

a)

Mg and O2

b)

MgO

c)

Mg and MgO

d)

O and MgO

16.

Balance this equation, __Al2O3 ---> __Al + __O2

a)

Cannot be balanced

b)

2Al2O3 ---> 2Al + 3O2

c)

2Al2O3 ---> 4Al + 3O2

d)

3Al2O3 ---> 2Al + O2

17.

Balance this equation: __H2 + __N2 → __NH3

a)

H2 + 4N2 → NH3

b)

H2 + 3N2 → 2NH3

c)

3H2 + N2 → 2NH3

d)

2H2 + 2N2 → 2NH3

18.
Balance this reaction: ____ HCN + ____ CuSO4 ---->____ H2SO4 + ____ Cu(CN)2
a)
2,1,1,2
b)
2,1,1,1
c)
1,2,2,1
d)
1,2,1,1
19.

Balance this equation: ___C3H8 +___O2 --> ___CO2 + ___H2O

a)

1,5,3,4

b)

2,8,6,8

c)

already balanced

d)

1,5,5,4

20.
What is the molar mass of dihydrogen dioxide (H2O2)?
a)
48 g/mole
b)
34.02 g/mole
c)
36.5 g/mole
d)
35.5 g/mole
21.

What are the units for molar mass?

a)

grams

b)

amu

c)

grams per mole

d)

amu per mole

22.
Which compound has the smallest molar mass?
a)
CO
b)
CO2
c)
H2O
d)
H2O2
23.

The number 6.02 x 1023, which is the number of particles found in a mole, is also known as what?

a)

molar mass

b)

atomic mass

c)

Avogadro's number

d)

molecular mass

24.

The word equation "magnesium reacts with chlorine to produce magnesium chloride" is best represented by which of the following formula equations?

a)

Mg -->Cl2 + MgCl2

b)

MgCl2 --> Mg + Cl2

c)

MgCl2 + Mg --> Cl2

d)

Mg + Cl2 --> MgCl2

25.

(s), (l), (g) and (aq) represent what information about the chemicals involved in a reaction?

a)

Size

b)

Quantity

c)

State of Matter

d)

Color

26.

In writing an equation that produces hydrogen gas, the correct formula for hydrogen gas is?

a)

HH

b)

H2

c)

2H

d)

Hg

27.

What happens in ALL chemical changes?

a)

Change in state of matter

b)

A new chemical substance is formed

c)

Bubbles are produced

d)

An explosion

28.

Which of the following is evidence that a chemical reaction has occurred?

a)

change in shape

b)

melting

c)

formation of a gas

d)

dissolving

29.

What is the mass of one mole of Nitrogen N2?

a)

14.01 amu

b)

14.01 g

c)

28.02 g

d)

28.02 amu

30.
Fluorine is diatomic.  What is the molar mass of fluorine gas?
a)
18.998 g/mol
b)
37.996 g/mol
c)
9 g/mol
d)
18 g/mol
31.

How many moles are 6.02 x 1023 molecules of H2O?

a)

1

b)

18

c)

22.4

d)

10

32.

A mole of carbon dioxide contains 6.02 x 1023 _____.

a)

atoms

b)

grams

c)

ions

d)

molecules

33.

What is the molar mass of MgCl2?

a)

24.31 g/mol

b)

95.21 g/mol

c)

59.76 g/mol

d)

70.90 g/mol

34.

What are the products of combustion?

a)

Carbon monoxide and water

b)

Carbon dioxide and water

c)

Oxygen and water

d)

Oxygen and carbon dioxide

35.

If a chemical is dissolved in water, it will be written with a ____.

a)

(s)

b)

(l)

c)

(g)

d)

(aq)

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