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Chemical Reactions

Total questions: 58

Worksheet time: 1hrs 20mins

Name
Class
Date
1.
In a ___________change, a substance changes into a different substance.
a)
Physical
b)
Chemical
2.
Which of these is NOT a sign that a chemical change has occurred? 
a)
A loss of transparency 
b)
An unexpected color change
c)
A temperature change
d)
The formation of a precipitate
3.
In a chemical reaction, bonds are broken and new bonds are formed that create new substances. The bonds that are broken are called what?
a)
Reactants
b)
Products
c)
Atoms
d)
Catalysts
4.
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
5.
How many Al atoms are in this compound?         4Al2O3
a)
2
b)
8
c)
6
d)
4
6.

Which of the following 2 are chemical reactions?

a)

sugar dissolving in water

b)

water turning into steam

c)

burning wood

d)

mixing baking soda and vinegar

e)

tearing paper

7.

How many Carbons are present on the reactant side?

a)

1

b)

2

c)

3

d)

4

8.

How many Hydrogens are on the product side of this chemical equation?

a)

1

b)

2

c)

3

d)

4

9.

Why are chemical equations always balanced? Select ALL that apply.

a)

Matter cannot be created.

b)

Matter cannot be destroyed.

c)

Matter can only be rearranged/conserved.

d)

Matter doesn't matter.

10.

In a chemical reaction, if the reactants are heated, the reaction usually happens

a)

slower

b)

faster

c)

at the same rate

d)

in a smaller volume

11.

Some chemical reactions require a substance called a catalyst. The purpose of a catalyst is

a)

to warm up the reaction

b)

to speed up the reaction

c)

to create more reactants

d)

to stop the reaction

12.

What does it mean for a reaction to be endothermic? Choose 2 of the following.

a)

When two substances react, the temperature of the mixture decreases.

b)

When two substances react, the temperature of the mixture increases.

c)

There is less energy going into the reactant to break the bond than there is energy leaving the product.

d)

There is more energy going into the reactant to break the bond than there is energy leaving the product.

e)

The amount of energy entering and leaving is the same.

13.

What does it mean for a reaction to be exothermic? Choose 2 of the following.

a)

When two substances react, the temperature of the mixture decreases.

b)

When two substances react, the temperature of the mixture increases.

c)

There is less energy going into the reactant to break the bond than there is energy leaving the product.

d)

There is more energy going into the reactant to break the bond than there is energy leaving the product.

e)

The amount of energy entering and leaving is the same.

14.

Is this chemical equation balanced? Why or why not? Choose the BEST answer.

a)

Yes, the amount of atoms for each element are equal on both the reactant and product side.

b)

No, the carbons are not the same number on both the reactant and product side.

c)

No, neither the carbons or hydrogens are the same amount on both the reactant and product side.

d)

No, none of the elements (carbon, hydrogen, or oxygen) are the same amount on both the reactant and product side.

15.
When a scientist mixed two chemicals, an exothermic reaction takes place. Which of the following would be proof that the reaction was exothermic?
a)
a change of color
b)
a change of state
c)
a temperature decrease
d)
a temperature increase
16.
In any chemical reaction, the mass of the products is always:
a)
slightly less than the mass of the reactants
b)
much less than the mass of the reactants
c)
the same as the mass of the reactants
d)
greater than the mass of the reactants
17.
Which is the name of the kind of solid substance formed in this figure?  
a)
aqueous 
b)
precipitate
c)
acid
d)
synthesis 
18.
An element plus additional element reacts to form one product is an example of which type of chemical reaction? 
a)
combustion
b)
decomposition 
c)
synthesis 
d)
single replacement
19.
Which type of reaction takes place in the presence of oxygen and produces carbon dioxide and water?
a)
double replacement 
b)
decomposition 
c)
combustion 
d)
single replacement
20.
Describes the number of molecules in a compound and is used to balance a chemical reaction. 
a)
coefficient 
b)
subscript
c)
superscript
d)
SI unit
21.
What type of chemical reaction takes place when fluorine reacts with sodium bromide?
a)
single replacement 
b)
double replacement 
c)
combustion
d)
synthesis 
22.
type of chemical reaction where an element reacts with a compound and takes the place of another element in that compound
a)
Double Displacement
b)
Single Displacement
c)
Synthesis
d)
Decomposition
23.
type of chemical reaction where two compounds react, and the positive ions (cation) and the negative ions (anion) of the two reactants switch places, forming two new compounds or products
a)
Double Displacement
b)
Single Displacement
c)
Synthesis
d)
Decomposition
24.
type of reaction in which a compound is broken down into its simple elements
a)
Double Displacement
b)
Single Displacement
c)
Synthesis
d)
Decomposition
25.

What type of reaction is illustrated below?

FeS + HCl --> H2S + FeCl

a)

synthesis

b)

decomposition

c)

single replacement

d)

double replacement

26.
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
27.
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
28.
What type of reaction is illustrated below?
2HI --> H2  +  I2
a)
synthesis
b)
decomposition
c)
single replacement
d)
double replacement
29.

What type of reaction is illustrated below?

Zn + H2S --> ZnS + H2

a)

synthesis

b)

decomposition

c)

single replacement

d)

double replacement

30.
A shorter way of writing a chemical reaction is a
a)
Chemical Equation
b)
Chemical Formula
c)
Compound
d)
Element 
31.
Is this equation balanced?
a)
yes
b)
no
c)
Not enough information
32.
What is the arrow in a chemical equation...
H2 + O --> H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
33.
What is the little number after an element in a chemical equation called.
Example: H2
a)
Coefficient 
b)
Subscript
c)
Atom
d)
Equation
34.
Balance this equation
_Zn+_HCl-->_ZnCl2 +_H2
a)
1,1,2,1
b)
1,1,1,2
c)
1,2,1,1
d)
2,1,1,1
35.
Balance this equation-
_SeCl6+_O2>_SeO2+_Cl2
a)
1,2,1,2
b)
1,1,1,3
c)
1,2,1,1
d)
2,1,1,1
36.
Balance this equation.
_Mg + _Cl2 --> _MgCl2
a)
1, 2,1
b)
already balanced
c)
2,1,1
d)
1,1,2
37.
Balance this equation
_N2 + _H2 --> _NH3
a)
1,2,3
b)
1,3,2
c)
1,1,2
d)
2,1,1
38.
Four students performed four different investigations by combining different substances. Their results are shown in the table provided. In which experiment are new substances being formed?
a)
Experiment 1
b)
Experiment 2
c)
Experiment 3
d)
Experiment 4
39.
A clear liquid from a flask is poured into another clear liquid in a beaker. Which of the following results of this procedure would indicate a new substance was formed?
a)
The level of the substance in the beaker is higher after the other liquid is added.
b)
A yellow solid forms and then settles to the bottom of the beaker.
c)
Small white crystals are left behind in the flask that held the first liquid.
40.
Balance this reaction: ____ Na3PO4 + ____ KOH ---> ____ NaOH + ____ K3PO4
a)
1,3,3,1
b)
1,3,2,1
c)
2,3,3,1
d)
1,1,3,1
41.
Balancing this reaction: ____ CH4 + ____ O2 ---> ____ CO2 + ____ H2O
a)
2,1,3,1
b)
1,2,1,2
c)
1,2,2,1
d)
2,1,1,2
42.
Balance this reaction: ____ NaF + ____ Br2 ---> ____ NaBr + ____ F2
a)
3,1,2,1
b)
1,2,3,4
c)
2,1,2,1
d)
1,2,1,2
43.
Balance this reaction: ____ AlBr3 + ____ K2SO4 ---> ____ KBr + ____ Al2(SO4)3
a)
1,1,1,1
b)
2,3,6,1
c)
2,6,1,1
d)
3,1,2,2
44.
Balance this reaction: ____ NH3 + ____ H2SO4 ---> ____ (NH4)2SO4
a)
2,1,1
b)
2,1,2
c)
1,2,2
d)
2,2,1
45.
Balance this reaction: ____ GaF3 + ____ Cs ---> ____ CsF + ____ Ga
a)
1,1,3,1
b)
1,2,3,1
c)
2,3,3,1
d)
1,3,3,1
46.
Balance this reaction: ____ BaS + ____ PtF2 ---> ____ BaF2 + ____ PtS
a)
1,1,1,1
b)
1,2,1,1
c)
1,1,1,2
d)
2,1,1,1
47.
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
48.
Balance this reaction: ____ RbNO3 + ____ BeF2 ----> ____ Be(NO3)2 + ____ RbF
a)
1,1,1,1
b)
1,2,1,1
c)
2,1,1,2
d)
2,1,2,1
49.
Balance this reaction: ____ C5H14 + ____ O2 ----> ____ CO2 + ____ H2O
a)
1,8,5,7
b)
2,12,5,14
c)
3,27,15,24
d)
2,17,10,14
50.
The number of atoms of oxygen in 
Cu(NO3)2 is ...
a)
2
b)
5
c)
6
d)
zero 
51.
Mg + N2 --> Mg3N2
a)
Synthesis (combination)
b)
Decomposition
c)
Single replacement
d)
Combustion
52.
Identify the type of chemical reaction demonstrated by this equation:
KClO3  →  KCl  +  O2
a)
decomposition
b)
combustion
c)
compositions
d)
single replacement
53.
Which type of chemical reaction is this an example of?
Fe2(SO4)3  + KOH →  K2SO4  +  Fe(OH)3
a)
composition
b)
double replacement
c)
single replacement
d)
combustion
54.
Identify the type of reaction shown by this chemical equation:
Al  +  HCl  →  AlCl3  +  H2
a)
single replacement
b)
composition
c)
double replacement
d)
decomposition
55.

Which is the correctly balanced equaition?

a)

Cl2 + 2NaI → 2NaCl + I2

b)

Cl2 + 2NaI → NaCl + 2I2

c)

Cl2 + NaI → NaCl + I2

d)

2Cl2 + NaI → 2NaCl + I2

56.
Identify the reactant(s) and product(s) of the reaction.
a)
All three are reactants and none are products.
b)
Hydrogen and water are the reactants, and oxygen is the product.
c)
Water and oxygen are the reactants, and hydrogen is the product.
d)
Hydrogen and oxygen are the reactants, and water is the product.
57.
How many Oxygen (O) atoms are in 2C2HO8Cl2
a)
2
b)
16
c)
8
d)
5
58.
Select the pair of words that correctly displays the general FORMAT for writing CHEMICAL EQUATIONS.
a)
products  -->  reactants
b)
products  -->  products
c)
reactants  -->  products
d)
reactants  -->  reactants

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