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Chemical Reactions

Total questions: 50

Worksheet time: 2hrs 8mins

Name
Class
Date
1.

What is the smallest unit of matter that retains the properties of an element?

a)

Particle

b)

Atom

c)

Molecule

d)

Cell

2.

Which subtopic of Physical Science deals with the study of chemical changes and reactions?

a)

Geology

b)

Biology

c)

Physics

d)

Chemistry

3.

What are substances that release hydrogen ions when dissolved in water called?

a)

bases

b)

alkalis

c)

salts

d)

acids

4.

What is the term for a push or pull on an object?

a)

pressure

b)

force

c)

acceleration

d)

velocity

5.

What is the ability to do work or cause change called?

a)

motion

b)

force

c)

power

d)

energy

6.

Which subtopic of Physical Science focuses on the study of motion and its causes?

a)

Optics

b)

Thermodynamics

c)

Mechanics

d)

Electromagnetism

7.

What is the SI unit of force?

a)

Newton (N)

b)

Second (s)

c)

Meter (m)

d)

Kilogram (kg)

8.

What is the energy possessed by an object due to its motion called?

a)

thermal energy

b)

potential energy

c)

kinetic energy

d)

electrical energy

9.

What is the energy stored in an object due to its position or condition called?

a)

kinetic energy

b)

thermal energy

c)

mechanical energy

d)

potential energy

10.

Which subtopic of Physical Science deals with the study of atoms and the basic building blocks of matter?

a)

Atomic Theory

b)

Cellular Respiration

c)

Molecular Biology

d)

Quantum Mechanics

11.

A chemical reaction that start releases energy into the environment (light, heat, sound...) is called a _________________ reaction

a)

exothermic

b)

endothermic

c)

reversable

d)

impossible

12.

If the reactants have 

higher chemical energy than the products of the reaction do, it is an _________________ reaction

a)

exothermic

b)

endothermic

c)

reversible

d)

impossible

13.

This graph show the progress of a(n) _________________ reaction

a)

exothermic

b)

endothermic

c)

reversible

d)

impossible

14.

In an endothermic reaction the reactants have ____________ chemical energy than the products

a)

more

b)

less

c)

the same

15.

In an endothermic reaction, energy must be _________________ for the reaction to proceed.

a)

released

b)

absorbed

c)

destroyed

16.

Photosynthesis is an example of an

a)

exothermic reaction

b)

endothermic reaction

17.
In the equation,          2Mg + O2 ---> 2MgO, which are the reactants?
a)
Mg and O
b)
MgO
c)
Mg and MgO
d)
O and MgO
18.
Balance this equation, Ca + H2O --> CaO + H2
a)
Ca + 2H2O --> CaO + 2H2
b)
2Ca + H2O --> CaO + H2
c)
Its balanced as it is
d)
Cannot be balanced
19.
What type of chemical reaction is this one?
Al(OH)3 --> Al2O3  + H2O
a)
Decomposition
b)
Combustion
c)
Synthesis
d)
Single Replacement 
20.
What type of chemical reaction is this one?
Ca + MgCl2 --> CaCl2 + Mg
a)
Decomposition
b)
Combustion
c)
Synthesis
d)
Single Replacement 
21.
What is a coefficient?
a)
The small number on the right of the chemical symbol.
b)
The large number to the left of a formula.
22.
What coefficients are needed to correctly balance the equation?
_Bi   +   _O2   >   _Bi2O3
a)
3,2,3
b)
2,3,2
c)
4,3,2
d)
none of these
23.
The left side of the equation below is called
a)
Products
b)
Reactants
24.
What type of reaction is illustrated below?
2HI --> H2  +  I2
a)
synthesis
b)
decomposition
c)
single replacement
d)
double replacement
25.

What type of reaction is illustrated below?

Zn + H2S --> ZnS + H2

a)

synthesis

b)

decomposition

c)

single replacement

d)

double replacement

26.
A number in front of a chemical formula in an equation that indicates how many molecules or atoms of each reactant and product are involved in a reaction.
a)
Coefficient
b)
reactant
c)
subscript
d)
product 
27.
Which of the following answers will balance the equation below?
__K + __Br2 --> __KBr
a)
2, 1, 1
b)
2, 3, 2
c)
2, 1, 2
d)
1, 2, 3
28.
Which of the following options correctly balances the equation below?
__HNO2 + __O2 --> __HNO3
a)
4, 1, 4
b)
1, 2, 1
c)
1, 2, 1
d)
2, 1, 2
29.

A + B > AB

What type of chemical reaction is this?

a)
single
b)
double
c)
synthesis
d)
decomposition
30.
How many atoms of hydrogen (H), sulfur (S), and oxygen (O) are there in sulfuric acid (H2SO4)?
a)
H-6, S-4, O-4
b)
H-1, S-2, O-8
c)
H-2, S-1, O-4
d)
H-2, S-4, O-4
31.

2Ca + O2 > 2CaO 

What is the 2 located behind oxygen (O) called?

a)
coefficient
b)
reactant
c)
subscript
d)
product
32.
What type of chemical reaction is this one?
Al(OH)3 --> Al2O3  + H2O
a)
Decomposition
b)
Combustion
c)
Synthesis
d)
Single Replacement 
33.
What type of chemical reaction is this one?
CUO + CO2 --> CuCO3
a)
Decomposition
b)
Combustion
c)
Synthesis
d)
Single Replacement 
34.
What type of chemical reaction is this one?
Ca + MgCl2 --> CaCl2 + Mg
a)
Decomposition
b)
Combustion
c)
Synthesis
d)
Single Replacement 
35.
What type of chemical reaction is this one?
C2H2 + O2 --> CO2 + H2O
a)
Decomposition
b)
Combustion
c)
Synthesis
d)
Single Replacement 
36.
Which of the following could indicate a chemical change? 
a)
All of the answers could indicate Chemical Change 
b)
a color change has occurred 
c)
bubbles appear 
d)
identifying one or more new chemical products 
37.
3KOH + H3PO4 --> K3PO4 + 3H2O
a)
Combination
b)
Decomposition
c)
Single replacement
d)
Double replacement
38.

(NH4)2Cr2O7 How many H are in this atom?

a)

2

b)

4

c)

6

d)

8

39.

PCl5 +H2O --> POCl3 +HCl. How many chlorine (Cl) atoms?

a)

Reactants: 5; Products: 3

b)

Reactants 5; Products 5

c)

Reactants 5: Products 4

d)

Reactants 3; Products 5

40.

Which Option is Correctly Balanced?

a)

Hg + O2 --> Hg2O2

b)

2 Hg + 2O2 --> Hg2O2

c)

2 Hg + O2 --> Hg2O2

d)

Hg + 2 O2 --> Hg2O2

41.

How many atoms of Carbon are in the following formula?

3C2H6

a)

3

b)

6

c)

9

d)

18

42.

What are the coefficients that will balance the skeleton equation below?

__Na + __F₂ → __NaF

a)

1, 2, 1

b)

2, 1, 2

c)

1,1,1

d)

2,2,2

43.

What are the coefficients that will balance the skeleton equation below?

__Na + __MgF₂ → __NaF + __Mg

a)

2,1,1,2

b)

1,2,1,2,

c)

2, 1, 2, 1

d)

1,2,2,1

44.

What are the coefficients that will balance the skeleton equation below?

___N₂ + __H₂ → __NH₃

a)

1,3,2

b)

1,2,3

c)

3,2,1

d)

1,2,1

45.

What are the coefficients that will balance the skeleton equation below?

__Sn + __HF → __SnF₂ + __H₂

a)

2,1,1,2

b)

1, 2, 1, 1

c)

2,1,2,1

d)

1,2,1,2

46.

What are the coefficients that will balance the skeleton equation below?

__Fe +__O₂ → __Fe₂O₃

a)

3,4,2

b)

4, 3, 2

c)

2,3,4

d)

4,2,3

47.

What are the coefficients that will balance the skeleton equation below?

__MgS + __O₂ → __MgO + __SO₂

a)

3,2,2,3

b)

2,3,2,2

c)

2,3,2,3

d)

3,2,2,1

48.

What are the coefficients that will balance the skeleton equation below?

__CH₄ + __O₂ → __CO₂ + __H₂O

a)

2,1,2,1

b)

2,1,1,2

c)

1,2,1,2

d)

1,2,2,1

49.
__C6H12O6 + __O2 --> __H2O + __CO2
a)
1,6,6,6
b)
already balanced
c)
1,6,1,6
d)
2,12,12,12
50.
What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?__Na + __H2O --> __NaOH + __H2
a)
2,2 --> 2,1
b)
4,4 --> 4,1
c)
1,2 --> 2,4
d)
1,2 --> 2,1

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