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Quiz 2 Chemical Reaction

Total questions: 23

Worksheet time: 28mins

Name
Class
Date
1.

6. Which of these processes is always exothermic?

a)

A. evaporation

b)

B. burning

c)

C. insulation

d)

D. melting

2.
Baking bread and cooking an egg are examples of....?
a)
Endothermic processes
b)
Exothermic processess
c)
None of these 
3.

What type of reaction occurs in a hand warmer?

a)

exothermic

b)

endothermic

4.
2Pb(NO3)2 --> 2PbO + 4NO2 + O2
a)
Synthesis 
b)
Decomposition
c)
Single displacement
d)
Combustion
5.
2Fe + 3H2SO4 --> Fe2(SO4)3 + 2H2
a)
Synthesis 
b)
Decomposition
c)
Single displacement
d)
Combustion
6.
Which chemical reaction breaks down into 2 substances?
a)
Double Replacement
b)
Single Replacement
c)
Synthesis
d)
Decomposition
7.
3Ca + 2AlCl3 --> 3CaCl2 + 2Al
a)
Synthesis
b)
Decomposition
c)
Single diplacement
d)
Double displacement
8.
What is a coefficient?
a)
The small number on the right of the chemical symbol.
b)
The large number in front of a chemical formula.
c)
The number in between the chemical symbols.
d)
The number behind a chemical formula.
9.
Which problem is balanced?
(Check ALL answers)
a)
PbO2 + 2H2
b)
SO2 + H20 --> H2SO4
c)
2Na + 2H2O --> 2NaOH + H2
10.
The reactants are on the left side of the chemical equation.
a)
True
b)
False
11.

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

C10H12N2O

a)
22
b)
24
c)
25
d)
4
12.
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
13.
Is burning wood a chemical or physical change?
a)
chemical
b)
physical
14.
Is glass breaking a chemical or phyiscal change?
a)
chemical
b)
physical
15.
Is melting butter for popcorn a chemical or physical change?
a)
chemical
b)
physical
16.
What is the left part of a chemical equation called?
H2 + O → H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
17.
Is this balanced?
2HgO → 2Hg + O2
a)
Yes
b)
No
18.
Is this balanced?
Al + O2 → 2Al2O3
a)
Yes
b)
No
19.

Which of the following describes the basic structure of single replacement reactions?

a)

A + B --> C

b)

A + B --> AB

c)

A + BC --> AC + B

d)

AB + CD --> AD + CB

20.

What type of reaction is this?


2NaHCO3 --> Na2CO3 + H2O + CO2

a)

Single Replacement

b)

Combustion

c)

Decomposition

d)

Synthesis

21.

Which coefficient should be placed in front of NH3 to balance this equation?


NH3 + H2SO4 --> (NH4)2SO4

a)

1

b)

2

c)

3

d)

1,000,000,000

22.

What type of reaction is this?


Pb(NO3)2 + 2KI --> 2KNO3 + PbI2

a)

Double Replacement

b)

Single Replacement

c)

Synthesis

d)

Decomposition

23.

What type of reaction is this?

4 Fe + 3 O2 --> 2 Fe2O3

a)

Synthesis

b)

Combustion

c)

Single Replacement

d)

Decomposition

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