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Science California Chemical Reactions

Total questions: 60

Worksheet time: 1hrs 12mins

Name
Class
Date
1.

Which of the following is not a sign of a chemical reaction?

a)

change of energy or heat

b)

color change

c)

formation of a precipitate

d)

change of mass

e)

change of smell

2.

How many Carbons are in the following formula? CaCO3

a)

3

b)

2

c)

1

d)

0

3.

Which of the following is a balanced equation?

a)

Na + Cl2--> NaCl

b)

C + O2 --> CO

c)

2H2O--> 2H2 + O2

d)

NaOH + 2HCl --> NaCl + H2O

4.

Which of the following is a decomposition equation?

a)

Na + Cl2--> NaCl

b)

C + O2 --> CO

c)

2H2O--> 2H2 + O2

d)

NaOH + 2HCl --> NaCl + H2O

5.

Which of the following is a double replacement equation?

a)

Na + Cl2--> NaCl

b)

C + O2 --> CO

c)

2H2O--> 2H2 + O2

d)

NaOH + HCl --> NaCl + H2O

6.

Which of the following is a single replacement equation?

a)

Na + Cl2--> NaCl

b)

NaBr + Cl2 --> NaCl + Br2

c)

2H2O--> 2H2 + O2

d)

NaOH + HCl --> NaCl + H2O

7.

For a process to be defined as a chemical reaction, _____ must be produced.

a)

a new substance

b)

the same substance

c)

light

d)

more mass

8.

Which equation indicates a synthesis reaction?

a)

2HgO -->2Hg + O2

b)

CH4 + 2O2 --> CO2 + 2H2O

c)

Zn + Cu --> Zn + Cu

d)

4H2 + 2O2 ---> 4H2O

9.

Which equation indicates a decomposition reaction?

a)

2HgO -->2Hg + O2

b)

CH4 + 2O2 --> CO2 + 2H2O

c)

Zn + Cu --> Zn + Cu

d)

4H2 + 2O2 ---> 4H2O

10.

Which equation indicates a combustion reaction?

a)

2HgO -->2Hg + O2

b)

CH4 + 2O2 --> CO2 + 2H2O

c)

Zn + Cu --> Zn + Cu

11.

Which of the following is an example of an acid-base reaction?

a)

Na + Cl2--> NaCl

b)

NaBr + Cl2 --> NaCl + Br2

c)

2H2O--> 2H2 + O2

d)

NaOH + HCl --> NaCl + H2O

12.

A chemical reaction is the process of converting ____ to ___

a)

atoms; molecules

b)

reactants; products

c)

an acid; a base

d)

matter; energy

13.

Which of the following are required for combustion to take place?

a)

oxygen

b)

carbon

c)

water

d)

salt

14.

Zn + CuSO4 ---> ZnSO4 + Cu is an example of:

a)

synthesis reaction

b)

decomposition reaction

c)

single replacement reaction

d)

double replacement reaction

15.

Which of the following is an example of a chemical reaction?

a)

The breakdown of food into energy

b)

Photosynthesis in plants

c)

Metal rusting

d)

All of the above

e)

None of the above

16.

Which is the substance produced by a chemical reaction called?

a)

reactant

b)

product

c)

reagent

d)

combuster

17.

What kind of chemical reaction is where two substances combine to make a new substance?

a)

synthesis

b)

decomposition

c)

combustion

d)

single replacement

18.

What kind of chemical reaction can be represented by the equation A + BC --> AC + B?

a)

synthesis

b)

decomposition

c)

combustion

d)

single replacement

19.

What kind of chemical reaction can be represented by the equation AB --> A + B?

a)

synthesis

b)

decomposition

c)

combustion

d)

single replacement

20.

What kind of chemical reaction can be represented by the equation A + O2 --> AO2?

a)

synthesis

b)

decomposition

c)

combustion

d)

single replacement

21.

Which of the equations below is a double replacement reaction?

a)

Cd(NO3)2 + Na2W + 2NaNO3

b)

2Mg + O2 --> 2MgO

c)

2N2 + 3H2 --> 2NH3

d)

NH4Cl --> NH3Cl

22.

Which of the following is a decomposition reaction?

a)

CH4 + O2 --> CO2 + H2O

b)

CaO + CO2 --> CaCO3

c)

Mg + O2 --> MgO

d)

PbCO3 --> PbO + CO2

23.

In the following chemical reaction, what product is represented byX? AlCl3 + NaOH ---> X + NaCl

a)

AlNa

b)

it cannot be determined

c)

Al(OH)3

d)

Al3Cl

24.

Chemical reactions create and break down

a)

protons

b)

chemical bonds

c)

atoms

d)

none of the above

25.

Reactants start with products and create reactants.

a)

True

b)

False

26.

Which of the following represents a chemical change?

a)

iron rusting

b)

water freezing

c)

tearing paper

27.

You can tell a chemical reaction because it always produces...

a)

water

b)

a change of state

c)

a different substance

d)

reactants

28.

To balance a chemical equation, you should change only the:

a)

subscripts

b)

coefficients

c)

chemical formulas

d)

location of the arrow

29.

How many oxygen atoms are in the product of this equation? 2H2 + O2 ---> 2H2O

a)

2

b)

4

c)

8

d)

12

30.

Which one of the following is a chemical equation?

a)

Ice + Heat --> Water

b)

Iron + Oxygen --> Rust

c)

CO2

d)

C + O2 --> CO2

31.

Balance the following equation: Ag + O2 --> Ag2O

a)

Put a w in front of Ag

b)

Add a subscript 2 to the end of Ag2O

c)

Add a 4 in front of Ag and a 2 in front of Ag2O

d)

Add a 2 in front of Ag and a 1 in front of Ag2)

32.

C + O2 --> CO2; If the reactants include 7 g of C and 4 grams of O. What is the total amount of C and O in the products?

a)

7

b)

4

c)

11

d)

0

33.

If you try to balance an equation by changing the subscripts you change:

a)

the number of molecules of the product

b)

the identity of the compounds

c)

the atomic number

d)

the mass of the reactants

34.
Which of the following models best demonstrates a balanced chemical equation?
a)
F
b)
G
c)
H
d)
J
35.
The formula below represents the most common carbohydrate known as glucose. Which information can be determined from the chemical formula?
C6H12O6
a)
The structural arrangement of the atoms in a glucose molecule
b)
The color of a glucose molecule
c)
The size of a glucose molecule
d)
The number of atoms of each element in a glucose molecule
36.
Which of the following equations demonstrates an actual chemical reaction that forms a new substance?
a)
A
b)
B
c)
C
d)
D
37.
The chemical formula for glucose, a simple sugar, is C6H12O6. The formula for ethanol is C2H6O. What accounts for the differences in these compounds?
a)
The elements that make up glucose are different than the elements that make up ethanol
b)
The ratio of the elements is different in ethanol than in glucose
c)
The chemical properties of the elements are different in glucose and ethanol
d)
Glucose has more elements than the ethanol
38.
The reactants are on the left side of the chemical equation.
a)
True
b)
False
39.
The equation below represents a chemical reaction that occurs in living cells. How many atoms are represented in the reactants of this equation?
a)
6
6
b)
12
12
c)
24
24
d)
36
36
40.

How many atoms in all are in a molecule of serotonin?

C10H12N2O

a)
22
b)
24
c)
25
d)
4
41.
Coal contains carbon and other elements. Carbon dioxide forms when coal burns in the presence of oxygen. Which of these is the best evidence that a chemical reaction occurs when coal burns?
a)
The shape of the coal changes
b)
Oxygen is present
c)
A new substance is produced
d)
Coal is made up of more than one element
42.
All of the following reactions are correctly balanced except-
a)
A
b)
B
c)
C
d)
D
43.
What is the mass of H2O in the reaction above?
a)
70.01
b)
24.11
c)
21.44
d)
48.22
44.

In a ___________change, a substance changes into a different substance.

a)

Physical

b)

Chemical

45.

The Law of Conservation of Mass states

a)

that matter exists in all states and reacts the same

b)

that matter can only be changed into new substances by introducing a catalyst

c)

that matter exists in the same state throughout any chemical change

d)

that matter cannot be created or destroyed and that the mass of the products must equal the mass of the reactants

46.

How many Al atoms are in this compound? 4Al2O3

a)

2

b)

8

c)

6

d)

4

47.

a copper penny turning greenish after a few years.

a)

Physical change

b)

Chemical change

48.
What does the Law of Conservation of Mass state?
a)
Matter cannot be gained or lost in a chemical reaction.
b)
Matter can only be lost in a chemical reaction.
c)
Matter can only be gained in a chemical reaction.
d)
Matter can be gained and lost in a chemical reaction. 
49.
What is the left part of a chemical equation called?
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
50.
What is the right part of a chemical equation called...
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
51.
How many Sodium (Na) are in 6NaCl?
a)
1
b)
12
c)
6
52.
Is the following equation balanced?...
Al + O2 --> 2Al2O3
a)
Yes!
b)
No!
53.

2PO ---> 2P + O2

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

54.

Cl2 + 2HgO ---> 2HgCl + O2

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

55.

2KO + Cl2 ----> 2KCl + O2

a)

Synthesis

b)

Single Replacement

c)

Combustion

d)

Decomposition

e)

Double Replacement

56.

2HgClO3 ----> 2HgO + Cl2

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

57.

KCl2 + Hg2 SO4 -----> 2HgCl + KSO4

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

58.

BaCl2 + S2H ----> BaH + 2HCl

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

59.

Cu + 2S2 -----> CuS4

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

60.

CH2+ O3------> CO2 + H2O

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

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