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CHEMICAL REACTIONS TEST HS

Total questions: 75

Worksheet time: 1hrs 15mins

Name
Class
Date
1.

To balance a chemical equation, you can change

a)

compounds

b)

subscripts

c)

coefficients

d)

elements

2.

The color change that occurs when iron rusts is evidence of a(n)

a)

physical change

b)

increase in concentration

c)

temperature change

d)

chemical reaction

3.

The reaction in which methane is burned,

CH4 + 2O2 --> 2H2O + CO2

, is an example of a.....

a)

decomposition reaction

b)

combustion reaction

c)

precipitate reaction

d)

synthesis reaction

4.

Electrons and neutrons and protons in a nucleus make up

a)

a period

b)

an atom

c)

an isomer

d)

a group

5.

A reaction that combines simpler reactants to form a new compound is called a

a)

combustion reaction

b)

decomposition reaction

c)

concentration reaction

d)

synthesis reaction

6.

Which statement reflects the law of conservation of mass?

a)

Mass can be created but not destroyed.

b)

Mass can be destroyed but not created.

c)

Mass cannot be created or destroyed.

d)

Mass can be created and destroyed.

7.

In the chemical equation

2H2 + O2 --> 2H2O

2H2

a)

is a reactant

b)

is a product

c)

indicates a combustion reaction

d)

indicates the direction of the reaction

8.

This law states that, in a chemical reaction, the number of atoms present in the reactants is always equal to the

number of atoms present in the products.

a)

conservation of mass

b)

conservation of molecules

c)

conservation of subscripts

d)

conservation of coefficients

9.

In the equation

N2 + 3H2 --> 2NH3

, the coefficient of the hydrogen reactant is

a)

1

b)

2

c)

3

d)

6

10.

The rate of a chemical reaction can be affected by.....

a)

precipitates and concentration of reactants

b)

surface area of reactants and electrolysis

c)

precipitates and temperature of reactants

d)

increasing the temperature of the reaction

11.

The energy needed to break reactants apart or combine them into new products is known as

HINT HINT: Give off Energy

a)

bond energy

b)

exothermic energy

c)

heat energy

d)

endothermic energy

12.

An exothermic reaction is typically marked by a(n)

a)

decrease in concentration

b)

increase in temperature

c)

increase in elements

d)

decrease in catalysts

13.

Which equation represents a combustion reaction?

a)

Equation 1

b)

Equation 2

c)

Equation 3

14.

In the reactants for equation 1, what is the subscript for oxygen?

a)

4

b)

2

c)

3

15.

What are the reactants in equation 3.

a)

NH4

b)

NH4 and NO3

c)

N20

d)

N2O and H2O

16.

Which equation is not balanced?

a)

Equation 1

b)

Equation 2

c)

Equation 3

17.

How would you balance the equation that is not balanced?

4 lines
18.

Type the equation that is not balanced in it's correct form?(balanced)

4 lines
19.

Is reaction C endothermic or exothermic?

a)

endothermic

b)

exothermic

20.

Which reaction(s) require(s) more energy to break bonds in the reactants than is released by the formation of bonds in the

products?

a)

Reaction C

b)

Reaction C and D

c)

Reaction B and C

d)

Reaction A and D

21.

Which reaction(s) would you expect to release light or heat?

a)

Reaction A and B

b)

Reaction B and C

c)

Reaction A and D

d)

Reaction C and D

22.

To balance a chemical equation, you can change

a)

compounds

b)

subscripts

c)

coefficients

d)

elements

23.
In a ___________change, a substance changes into a different substance.
a)
Physical
b)
Chemical
24.

The starting materials in a chemical reaction....

a)
Products
b)
Reactants
c)
Starters
d)
Enders
25.
The substances listed on the right side of a chemical equation are the
a)
Yields
b)
Reactants
c)
Products
d)
Precipitates
26.

The process by which one or more substances change to produce one or more different substances

a)

Chemical Process

b)

Reactant

c)

Chemical Reaction

27.

A chemical reaction or process that releases heat.

a)

Endothermic

b)

Exothermic

28.
In the equation,          2Mg + O2 ---> 2MgO, which are the reactants?
a)
Mg and O
b)
MgO
c)
Mg and MgO
d)
O and MgO
29.

What reaction has the following general formula:

AB --> A + B

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

30.

What reaction has the following general formula:

A + B --> AB

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

31.

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

32.
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
33.

H2 + O --> H2O

a)

Synthesis

b)

Decomposition

c)

Single replacement

d)

Double replacement

34.

Identify the following process: We light a matchstick.

a)

Physical change

b)

Chemical change

35.

Is the following equation balanced?

Al + O2 ---> 2Al2O3

a)

YES

b)

NO

36.

What is the number before a chemical formula called?

Example: 2H2 + O2 ---> 2H2O

a)

Coefficient

b)

Atom

c)

Subscript

d)

Equation

37.

Which of the following equations are correctly balanced?

a)

12CO2 + H2O ---> C6H12O6 + O2

b)

CO2 + H2O ---> 3C6H12O6 + O2

c)

CO2 + 9H2O ---> C6H12O6 + O2

d)

6CO2 + 6H2O ---> C6H12O6 + 6O2

38.

Balance this equation:

H2 + Cl2 ---> HCl

a)

It is balanced.

b)

H2 + Cl2 ---> 2HCl

c)

3H2 + Cl2 ---> 6HCl

d)

H2 + 3Cl2 ---> 6HCl

39.

What are the numbers that you CANNOT change in a chemical equation? 

a)
Coefficient
b)
Products
c)
Reactants
d)

Subscripts

40.
How many atoms of carbon (C) are in C6H12O6?
a)
3
b)
6
c)
12
d)
24
41.
How many Hydrogen are in 4H2O?
a)
6
b)
8
c)
2
d)
4
42.

what is the function of a catalytic converter

a)

liquefies nitrogen, oxygen gas and carbon

b)

converters harmful emission into safe gases

c)

prevent car explosion by harmful gas

43.

In a chemical reaction

a)

The atoms of the reactants always stay together to form the products.

b)

The atoms of the reactants un-bond, rearrange, and then re-bond to form the products.

c)

New atoms are formed which combine to make the products

d)

Some atoms disappear while others multiply to form the products

44.

In the chemical reaction CH4 + 2O2 --> CO2 + 2H2O, there are reactants on the left of the equation and products on the right. If you count the atoms in the reactants, there are

a)

4 carbon atoms, 4 hydrogen atoms, and 2 oxygen atoms

b)

1 carbon atom, 4 hydrogen atoms, and 2 oxygen atoms

c)

1 carbon atom, 4 hydrogen atoms, and 4 oxygen atoms

d)

4 carbon atoms, 4 hydrogen atoms, and 4 oxygen atoms

45.

In a chemical reaction, mass is conserved. This means that

a)

The mass of the reactants stays the same during a chemical reaction

b)

The mass of the products stays the same during a chemical reaction

c)

The type and number of atoms in the reactants equals the type and number of atoms in the products

d)

The mass of the products is always twice the mass of the reactants

46.

The __________________ represent the number of molecules present in a chemical formula.

a)

subscripts

b)

coefficients

c)

products

d)

reactants

47.
Baking bread and cooking an egg are examples of....?
a)
Endothermic processes
b)
Exothermic processess
c)
None of these 
48.
What type of reaction is shown in the photo?
a)
Exothermic
b)
Isothermic
c)
Endothermic
d)
None of the  above
49.
Is photosenthysis an Exothermic or an Endothermic reaction?
a)
Endothermic
b)
Exothermic
50.

6 CO2+ 6 H2O + Energy → C6H12O6 + 6 O26\ CO_2+\ 6\ H_2O\ +\ Energy\ \rightarrow\ C_6H_{12}O_6\ +\ 6\ O_2

a)

endothermic reaction

b)

exothermic reaction

51.

A student mixed two chemicals to allow them to react. The temperature before the reaction was 25 ° C. The temperature after the reaction was 18° C. Which of the following is true?

a)

It is an exothermic reaction

b)

It is an endothermic reaction

52.

Balance this equation:

H2 + Cl2 ---> HCl

a)

It is balanced.

b)

H2 + Cl2 ---> 2HCl

c)

3H2 + Cl2 ---> 6HCl

d)

H2 + 3Cl2 ---> 6HCl

53.

Balance this equation:

HgO ---> Hg + O2

a)

It is balanced.

b)

2HgO ---> 2Hg + O2

c)

2HgO ---> Hg + O2

d)

HgO ---> Hg + 2O2

54.
How many HCl molecules do you need to balance this equation? 
Mg +  __HCl --->  MgCl2 + H2
a)
1
b)
2
c)
3
d)
4
55.
Balance this equation:
P4+O2  -->  P2O3
a)
3 P4+ O2 --> 2 P2O3
b)
 P4+ O2 --> 2 P2O3
c)
 P4+ 3 O2 --> 2 P2O3
d)

 P4 + O2 --> P4O2

56.

Which of the following is balanced?

a)

Mg + HCl --> H2 + MgCl2

b)

H2O + CO2 --> H2CO3

c)

KClO3 --> KCl + O2

d)

H2 + O2 --> H2O

57.

An ENDOTHERMIC reaction would feel ______ to the touch, while an EXOTHERMIC reaction would feel ______ to the touch.

a)

hot ; cold

b)

cold ; hot

58.

Drag and drop the coefficients that balance this equation 2 FeFe   + ​ (a)   Cl2Cl_2  ---->  ​ (b)     FeCl3FeCl_3  

Choose from the below words
3
2
59.

Balance this equation ​ (a)   N2 + ​ (b)   H2 --> ​ (c)   NH3

Choose from the below words
1
3
2
60.

According to the Law of Conservation of Mass (Matter), Matter cannot be ​ (a)   or ​ (b)   , it can only be ​ (c)   . This means however many atoms of an element we have before a reaction must be ​ (d)   to the number after a reaction.

Choose from the below words
created
destroyed
changed
equal
61.
What is the total number of atoms present in 5Na3PO4
a)
5
b)
40
c)
55
d)
8
62.

What's unbalanced about this equation? 

Al + O2 --> Al2O3

a)

Oxygen (O) only

b)

Aluminum (Al) only

c)

Both oxygen and aluminum

d)

Nothing; it is balanced.

63.

The potential energy diagram of a reaction is shown. Which statement below is correct relating to this reaction?

a)

#1 represents the enthalpy change for this exothermic reaction.

b)

#2 represents the enthalpy change for this endothermic reaction.

c)

#3 represents the enthalpy change for this endothermic reaction.

d)

#4 represents the enthalpy change for this exothermic reaction.

64.

What is the Heat of Reaction ΔH\Delta H  for this reaction?

a)

-200 KJ

b)

200 KJ

c)

400 KJ

d)

-300 KJ

65.

What type of reaction is this?

a)

Exothermic

b)

Endothermic

c)

Energy Producing

d)

No way to tell

66.

Endothermic:_________:__________

Exothermic:_________:__________

a)

positive:warm

negative:cold

b)

positive:warm

negative:warm

c)

positive:cold

negative:cold

d)

positive:cold

negative:warm

67.

Which of the following represents an exothermic reaction?

a)
b)
68.
The diagram represents which type of reaction
a)
endothermic
b)
exothermic
69.

Which of the following is a reactant in the following equation?


O2 + C6H12O6 > CO2 + H2O

a)

CO2

b)

H2O

c)

O2

70.
Which of these solutions is an acid?
a)
Dish Soap: pH of 12
b)
Tomato Soup: pH of 4
c)
Baking Soda: pH of 9
d)
Drain Cleaner: pH of 14
71.
The pH of vinegar is 2.5.  Vinegar is a _____________.
a)
strong acid
b)
strong base
c)
weak base
d)
weak acid
72.

Human blood has a pH between 7.35 and 7.45. Which of the following best describes human blood?

a)

strongly acidic

b)

slightly acidic

c)

strongly basic

d)

slightly basic

73.

Many cleaning solutions are bases. Which of the following is a property of most bases?

a)

feels slippery

b)

white color

c)

can only be liquid

d)

tastes sour

74.
This piece of pH paper has been dipped into:
a)
An acid
b)
A base
c)
A pH-neutral substance
d)
A buffer
75.

Is pure water acidic, basic, or neutral?

a)

Acidic

b)

Basic

c)

Neutral

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