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chemical reactions

Total questions: 93

Worksheet time: 3hrs 35mins

Name
Class
Date
1.

A substance that is formed as the result of a chemical reaction is a __________________

a)

Product

b)

Reactant

c)

Starters

d)

Enders

2.

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

a)

water freezes to form ice

b)

sugar dissolves in water

c)

gasoline burns in a car engine

d)

a piece of metal expands when it is heated

3.

Which one shows that a chemical reaction has occurred?

a)

dissolving

b)

melting

c)

formation of a gas

d)

bending

4.

What reaction has the following general formula:

AB --> A + B

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

5.

What reaction has the following general formula:

A + CD --> C + AD

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

6.

What reaction has the following general formula:

AB + CD --> CB + AD

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

7.

What reaction has the following general formula:

A + B --> AB

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

8.

What reaction has the following general formula:
 CxHy + O2 −>CO2 + H2OC_xH_y\ +\ O_2\ ->CO_{2\ }+\ H_2O  

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

9.

What is the general reaction scheme for a single replacement reaction?

a)

A + B --> AB

b)

AB --> A + B

c)

A + CD --> C + AD

d)

AB + CD --> CB + AD

e)

CxHy+O2 −> CO2+H2OC_xH_y+O_2\ ->\ CO_2+H_2O

10.

What type of reaction is the following:
 BaCl2+2KI −> 2KCl + BaI2BaCl_2+2KI\ ->\ 2KCl\ +\ BaI_2  

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

11.

What type of reaction is the following:
 C11H24+17O2−> 11CO2 + 12H2OC_{11}H_{24}+17O_2->\ 11CO_2\ +\ 12H_2O  

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

12.

What type of reaction is the following:
 2KI −> 2K + I22KI\ ->\ 2K\ +\ I_2  

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

13.

What type of reaction is the following:
 2NaHCO3−> Na2CO3+CO2+H2O2NaHCO_3->\ Na_2CO_3+CO_2+H_2O  

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

14.

What type of reaction is the following:
 Zn + 2HCl −> ZnCl2+H2Zn\ +\ 2HCl\ ->\ ZnCl_2+H_2 

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

15.

What type of reaction is the following:
 3CuS +2Al −> Al2S3+3Cu3CuS\ +2Al\ ->\ Al_2S_3+3Cu 

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

16.

What type of reaction is the following:
 2C4H10 +13O2 −> 8CO2+10H2O2C_4H_{10}\ +13O_2\ ->\ 8CO_2+10H_2O 

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

17.

What type of reaction is the following:
 Na2S +2HCl −> H2S+2NaClNa_2S\ +2HCl\ ->\ H_2S+2NaCl 

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

18.

What type of reaction is the following:
 Ag3N + 3HBr−>3AgBr+H3NAg_3N\ +\ 3HBr->3AgBr+H_3N 

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

19.
_P4+_O2 →  _P2O3
a)
3 P4+1 O2 → 2 P2O3
b)
1 P4+1 O2 → 2 P2O3
c)
1 P4+ 3 O2 → 2 P2O3
d)
1 P4+ 2 O2 → 3 P2O3
20.
_AgNO3 + _Cu →_Cu(NO3)2 + _Ag
a)
2 AgNO3 + 2 Cu → 3 Cu(NO3)2 + 1 Ag
b)
2 AgNO3 + 1 Cu → 1 Cu(NO3)2 + 2 Ag
c)
1 AgNO3 + 2 Cu → 2 Cu(NO3)2 + 1 Ag
d)
3 AgNO3 + 2 Cu → 3 Cu(NO3)2 + 2 Ag
21.
_BaS + _PtF2 → _BaF2 + _PtS
a)
1 BaS + 1 PtF2 → 1 BaF2 + 1 PtS
b)
4 BaS + 2 PtF2 → 1 BaF2 +  1 PtS
c)
1 BaS + 2 PtF2→ 2 BaF2 +  2 PtS
d)
1 BaS + 3 PtF2 →1 BaF2 +  2 PtS
22.
_AlBr3 + _K2SO4 → _KBr + _Al2(SO4)3
a)
6 AlBr3 + 1 K2SO4 → 6 KBr + 1 Al2(SO4)3
b)
2 AlBr3 + 3 K2SO4 → 6 KBr + 1 Al2(SO4)3
c)
1 AlBr3 + 1 K2SO4 → 2 KBr + 3 Al2(SO4)3
d)
2 AlBr3 + 3 K2SO4 → 1 KBr + 2 Al2(SO4)3
23.
_SO2 + _Li2Se →_SSe2 + _Li2O
a)
1 SO2 + 2 Li2Se → 1 SSe2 + 2 Li2O
b)
1 SO2 + 1 Li2Se → 2 SSe2 + 2 Li2O
c)
2 SO2 + 2 Li2Se → 2 SSe2 +  2 Li2O
d)
2 SO2 + 2 Li2Se → 1 SSe2 + 1 Li2O
24.
_SO2 + _Li2Se →_SSe2 + _Li2O
a)
1 SO2 + 2 Li2Se → 1 SSe2 + 2 Li2O
b)
1 SO2 + 1 Li2Se → 2 SSe2 + 2 Li2O
c)
2 SO2 + 2 Li2Se → 2 SSe2 +  2 Li2O
d)
2 SO2 + 2 Li2Se → 1 SSe2 + 1 Li2O
25.
_Al + _HCl →_H2 + _AlCl3
a)
2 Al + 2 HCl → 2 H2 + 6 AlCl3
b)
3 Al + 3 HCl → 6 H2 + 2 AlCl3
c)
1 Al + 1 HCl → 3 H2 + 1 AlCl3
d)
2 Al + 6 HCl → 3 H2 + 2 AlCl3
26.
_K + _Cl2 →_KCl
a)
2 K + 16 Cl2 → 8 KCl
b)
2 K + 1 Cl2 → 2 KCl
c)
3 K + 4 Cl2 → 3 KCl
d)
1 K + 1 Cl2 →1 KCl
27.
_NaF + _Br2 →_NaBr + _F2
a)
1NaF + 2 Br2 →1 NaBr + 2 F2
b)
2NaF + 2 Br2 → 2 NaBr + 2 F2
c)
2 NaF + 3 Br2 → 1 NaBr + 2 F2
d)
2 NaF + 1 Br2 → 2 NaBr + 1 F2
28.
Balance this equation,            Al2O3 ---> Al + O2 
a)
Cannot be balanced
b)
2Al2O3 ---> 2Al + 3O2 
c)
2Al2O3 ---> 4Al + 3O2 
d)
3Al2O3 ---> 2Al + O2 
29.
Balance this equation:  H2 + N2 → NH3
a)
 H2 + 4N2 → NH3
b)
 H2 + 3N2 → 2NH3
c)
 3H2 + N2 → 2NH3
d)
 2H2 + 2N2 → 2NH3
30.
How many total atoms are represented?         4Al2O3
a)
2
b)
8
c)
5
d)
20
31.
Substances that enter into a chemical reaction (found to the left side of the arrow) 
a)
product
b)
reactant
c)
chemical
d)
balanced equation
32.
The large number in front of a chemical formula or compound is the ___________. 
a)
coefficient
b)
product
c)
physical
d)
chemical
33.
In every balanced chemical equation, each side of the equation has the same number of ____.  
a)
coefficients
b)
moles
c)
molecules
d)
atoms of each element
34.
Is the following equation balanced or unbalanced?
Fe + S --> FeS
a)
balanced
b)
unbalanced
35.
What is the part of the chemical equation in green called? 
Fe + S --> FeS
a)
products
b)
reactants
c)
yield
d)
chemical formula
36.
How many atoms of aluminum are on each side of the following equation: 4Al + 3O2 --> 2Al2 O3
a)
2
b)
6
c)
1
d)
4
37.
___________________ are the elements or compounds that are formed in a chemical
reaction.
a)
Polymers
b)
Bonds
c)
Reactants
d)
Products
38.
Which of the following is an example of synthesis?
a)
Na + Br2 --> NaBr
b)
KClO3 --> KCl + O2
c)
HgO + Cl2-->HgCl + O2
d)
Cl2 + NaBr --> NaCl + Br2
39.

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

40.

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

41.

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

42.

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

43.

What do the coefficients need to be in the following equation in order to be balanced?

_Al +_HCl → _H2 +_AlCl3

a)

2, 6, 3, 2

b)

it is already balanced

c)

4, 12, 3, 4

d)

2, 1, 4, 5

44.
The red numbers in the image below represent ________
a)
subscripts
b)
coefficients
c)
I don't know, and don't want to try
d)
None of the answers are correct
45.
The blue numbers in the image below represent ________
a)
I don't know, and don't want to try
b)
coefficients
c)
subscripts
d)
none of the answers are correct
46.
__H2O2 --> __H2O + __O2
a)
already balanced
b)
2,1,1
c)
2,2,1
d)
2,1,2
47.

When we investigate the rate of reaction we are looking at the...

a)

amount of product formed

b)

speed of reaction

c)

concentration of reacting particles

d)

combining reactants with products

48.
Which factors increase the rate of a reaction.
a)
increasing temperature
b)
increasing concentration
c)
increasing surface area
d)
all of these
49.
Increase in temperature of the reactants can do one of the following
a)
Slow collision frequency
b)
Allow less effective collision between the particles
c)
Neutralise the reaction
d)
increase collision between the particles thus increasing the rate.
50.
Why does a catalyst increase the rate of reaction?
a)
it produces extra energy for the reactants
b)
it increases the speed of the reactant particles
c)
it increases the frequency of particle collisions
d)
it reduces the activation energy of the reaction 
51.
You add more bodies into a "mosh pit" to hope for more collisions.  You have increased-
a)
temperature
b)
concentration
c)
pressure
d)
catalyst
52.
Which of the following increase the reaction rate?
a)
less surface area
b)
lower temperature
c)
an inhibitor
d)
increased concentration
53.
Why don't all collisions between particles cause a reaction?
a)
the particles also need to collide with a catalyst
b)
not all the particles collide with enough energy
c)
not all the particles collide at a high enough temperature
d)
the particles need to collide with each other twice
54.
To slow down a chemical reaction you will do one of the following:
a)
Place the reactants in hot water
b)
Place the products in ice bath
c)
Place the reactants in a ice bath
d)
Keep stirring the reactants with a stirring rod
55.

How could we make this reaction happen more quickly?

a)

Decrease the concentration of the acid

b)

crush the chalk to increase the surface area

c)

Put the test tube in an ice bath

56.

The major theory of reaction rate is called

a)

Collision theory

b)

Crash theory

c)

Newton's laws

d)

Thermodynamics

57.

When surface area is decreased the rate of reaction...

a)

Decreases, because there are LESS possible sites for correct collisions

b)

Increases, because there are LESS possible sites for correct collisions

c)

Decreases, because there are MORE possible sites for correct collisions

d)

Increases, because there are MORE possible sites for correct collisions

58.

Four light sticks are placed in water baths of varying temperatures. At which temperature would the light stick glow the brightest?

a)

0° C

b)

20° C

c)

30° C

d)

40° C

59.

In which type of reaction do ions in two compounds switch places?

a)

synthesis

b)

decomposition

c)

single replacement

d)

double replacement

60.

A chemical reaction in which energy is absorbed is ______________.

a)

an endothermic reaction

b)

an exothermic reaction

c)

a single replacement reaction

d)

a double replacement reaction

61.

Which phrase describes what happens to atoms in a chemical reaction?

a)

never lost or gained, just rearranged

b)

sometimes lost, never rearranged

c)

sometimes lost, gained, or rearranged

d)

lost or gained, never rearranged

62.

Which of the following would react fastest in sweet tea?

a)

a sugar cube

b)

a sugar cube cut in half

c)

a sugar cube cut in fourths

d)

a sugar cube crushed into powder

63.

________ the concentration ______ the reaction rate.

a)

increasing; decreases

b)

increasing; increases

c)

decreasing; increases

d)

decreasing; does not effect

64.

Enzymes in your body act as catalysts. Thus, the role of enzymes is to___________.

a)

inhibit chemical reactions.

b)

increase the rate of chemical reactions.

c)

decrease the rate of chemical reactions.

65.

The minimum amount of energy needed for substances to react is called__________.

a)

Activation Energy

b)

Catalyst Energy

c)

Endothermic Energy

d)

Exothermic Energy

66.

In the ice cream lab, what events support an endothermic reaction? Click all that apply.

a)

Ice water temperature increasing

b)

Ice water temperature decreasing

c)

Frost on the outside of the container

d)

Creamer turning into ice cream

67.
If a chemical reaction is EXOTHERMIC, the temperature would....
a)
Stay the same
b)
Increase
c)
Decrease
68.
During an endothermic reaction in a beaker if we are part of the surroundings and touched the beaker, it would feel _______. 
a)
Warm
b)
Cold
69.
Baking bread and cooking an egg are examples of....?
a)
Endothermic processes
b)
Exothermic processess
c)
None of these 
70.
Is photosenthysis an Exothermic or an Endothermic reaction?
a)
Endothermic
b)
Exothermic
71.
What type of reaction is shown in the photo?
a)
Exothermic
b)
Isothermic
c)
Endothermic
d)
None of the  above
72.

Which of the following process is exothermic?

a)

Candle was melting

b)

A puddle evaporating

c)

Dry ice (solid carbon dioxide) subliming to form gaseous carbon dioxide

d)

Water freezing to form ice

73.

List four factors that affects the rate of a reaction

a)

temperature

b)

concentration

c)

surface area

d)

volume

e)

catalysts

74.
The following graph shows two different reaction pathways for the same overall reaction at the same temperature. Which pathway is slower and why?
a)
Red, because the activation energy is larger
b)
Blue, because the activation energy is lower
c)
both reaction progress at the same rate
75.

Thinking about graphs...

What does it mean if the graph has levelled off in a straight horizontal line?

a)

The reaction is taking a break

b)

The reaction has finished

c)

The reaction is still going

d)

The reaction is almost done

76.

Thinking about graphs...

Why does the curve go to a straight horizontal line?

a)

The products have been used up

b)

The reactants have been used up

c)

The products are still reacting

d)

The reactants are still reacting

77.

What is the rate of reaction?

a)

How fast a reaction is

b)

How big a reaction is

c)

How loud a reaction is

78.
One clue of a chemical change is the formation of a precipitate. A precipitate is formed when
a)
Two liquids react and a gas is produced
b)
A solid dissolves in a liquid
c)
One liquid dissolves in another
d)
Two liquids react and a solid is formed
79.
Catalysts permit reactions to proceed along a ___________energy path.
a)
lower
b)
higher
80.
Increasing the temperature will increase the kinetic energy of particles, therefore increasing the collisions between particles.
a)
false
b)
true
81.
You observe bubbles after adding metal to a solution. Do you assume a chemical reaction took place?
a)
Yes
b)
No
82.
Two clear and colorless solutions are combined within a test tube. The resulting solution is purple. Do you assume a chemical reaction took place?
a)
Yes
b)
No
83.

What type of reaction is this?

a)

Endothermic

b)

Exothermic

84.
What type of reaction is this?
a)
Endothermic
b)
Exothermic
85.

What is the name given to a catalyst in the human body?

a)

Biology

b)

Catalyst

c)

Chemical

d)

Enzyme

86.

Which graph shows the effect of increasing temperature on the rate of reaction of calcium carbonate with dilute hydrochloric acid?

a)
b)
c)
d)
87.
In which experiment is the rate of reaction between hydrochloric acid and calcium carbonate slowest? 
a)
A
b)
B
c)
C
d)
D
88.
B represents
a)
energy absorbed
b)
energy released
c)
activation energy
89.
In an endothermic reaction the products have 
a)
more energy than the reactants
b)
less energy than the reactants
c)
the same energy as the reactants
d)
no energy
90.
In an exothermic reaction the products have
a)
more energy than the reactants
b)
the same energy as the reactants
c)
less energy than the reactants
d)
no energy
91.
C represents
a)
energy absorbed
b)
energy released
c)
activation energy
92.
Which letter corresponds to the activation energy of the forward reaction?
a)
A
b)
B
c)
C
d)
D
93.
What type of reaction is shown in the reaction pathway?
a)
exothermic reaction
b)
endothermic reaction

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