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Savvas Phy Sci Unit 9 test Study guide

Total questions: 58

Worksheet time: 1hrs 5mins

Name
Class
Date
1.
What coefficient should be used to make the following equation balanced?
N2+O2--> _NO 
a)
1
b)
2
c)
3
d)
4
2.
Which problem is balanced?
(Check ALL answers)
a)
PbO2 + 2H2
b)
SO2 + H20 --> H2SO4
c)
2Na + 2H2O --> 2NaOH + H2
3.
What does the Law of Conservation of Mass state?
a)
Matter cannot be gained or lost in a chemical reaction.
b)
Matter can only be lost in a chemical reaction.
c)
Matter can only be gained in a chemical reaction.
d)
Matter can be gained and lost in a chemical reaction. 
4.
What is the left part of a chemical equation called?
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
5.
What is the right part of a chemical equation called...
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
6.
What is the total number of atoms present in 5Na3PO4
a)
5
b)
40
c)
55
d)
8
7.
Is the following equation balanced?
2C2H2 + 5O2 --> 4CO2 + 2H2O
a)
yes
b)
no
8.
Is the following equation balanced?
4Fe + 3O2 --> 2Fe2O3
a)
yes
b)
no
9.
Is the following reaction balanced?
NaHCO3 --> Na2CO3 + H2O + CO2
a)
yes
b)
no
10.
Is the following reaction balanced?
2CH3OH + 3O2 --> 2CO2 + 4H2O
a)
yes
b)
no
11.
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.
12.
What is the part of the chemical equation in green called? 
Fe + S --> FeS
a)
products
b)
reactants
c)
yield
d)
chemical formula
13.
What is the little number after an element in a chemical equation called.
Example: H2
a)
Coefficient 
b)
Subscript
c)
Atom
d)
Equation
14.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
15.
Element or compound?
H2O
a)
element
b)
compound
16.
How many HCl molecules do you need to balance this equation? 
Mg +  __HCl --->  MgCl2 + H2
a)
1
b)
2
c)
3
d)
4
17.
Is this balanced?
Al + O2 → 2Al2O3
a)
Yes
b)
No
18.

Is the equation balanced?: 2H2O + O2 --> 4MgO + 3Fe

a)

yes

b)

no

19.

Balance this equation

_Al +_HCl --> _H2 +_AlCl3

a)

2,6,3,2

b)

it's already balanced

c)

4,12,3,4

d)

2,1,4,5

20.

What is the Law of Conservation of Mass?

a)

It states that matter cannot be created or destroyed.

b)

It states that energy cannot be created or destroyed.

c)

It states that matter can be created or destroyed.

d)

It states that sound can be created or destroyed.

21.
What is the little number after an element in a chemical equation called.
Example: H2
a)
Coefficient 
b)
Subscript
c)
Atom
d)
Equation
22.

This is when heat is absorbed, it is an

a)

Exothermic reaction

b)

endothermic reaction

c)

both

d)

none

23.

When heat is released it is an

a)

exothermic reaction

b)

endothermic reaction

c)

both

d)

none

24.

The temperature increases outside of this reaction

a)

exothermic

b)

endothermic

c)

both

d)

none

25.

The temperature decreases outside of this reaction

a)

exothermic

b)

endothermic

c)

both

d)

none

26.

Evidence of a chemical reaction is when 2 substances react, they

a)

stay the same

b)

form a new substance

c)

both

d)

none

27.

Your hands get cold outside from not wearing gloves

a)

exothermic

b)

endothermic

c)

both

d)

none

28.

Fire is an example of

a)

exothermic reaction

b)

endothermic reaction

c)

none

d)

both

29.

Fireworks are an example of

a)

exothermic

b)

endothermic

c)

both

d)

none

30.

A melting ice cube is an example of

a)

exothermic

b)

endothermic

c)

none

d)

both

31.

An ice pack in an example of

a)

exothermic

b)

endothermic

c)

both

d)

none

32.

photosynthesis is an example of

a)

Exothermic reaction

b)

Endothermic reaction

c)

both

d)

none

33.

Frying an egg is an example of

a)

exothermic reaction

b)

endothermic reaction

c)

both

d)

none

34.
After you mix two substances together, a new substance forms.  This is an example of:
 
a)
 Physical Change
b)
 Chemical Change
35.
Sugar dissolves in water.  This is an example of....
a)
Physical Change
b)
Chemical Change
36.
Evaporation is what kind of change?
a)
Endothermic
b)
Exothermic
37.
Condensation and raining are examples of what?
a)
Exothermic
b)
Endothermic
38.
Baking bread and cooking an egg are examples of....?
a)
Endothermic processes
b)
Exothermic processess
39.
If a chemical reaction is EXOTHERMIC, the temperature would....
a)
Stay the same
b)
Increase
c)
Decrease
40.
When you freeze water, it turns to ice.  What kind of change is this?
a)
 Physical
b)
Chemical
41.
When you freeze water, it turns to ice.  What process is this?
a)
 Exothermic
b)
Endothermic
42.
When iron nails get rusty, heat is released.  What kind of change is this?
a)
Chemical
b)
Physical
43.
When iron nails get rusty, heat is released.  What process is this?
a)
Exothermic
b)
Endothermic
44.
Which of the following is a sign that a chemical reaction has occurred?
a)
change in shape
b)
melting
c)
bubbles of gas appear
d)
dissolving
45.
Is hammering wood together to build a house a chemical or physical change?
a)
chemical
b)
physical
46.
Catalysts permit reactions to proceed along a ___________energy path.
a)
lower
b)
higher
47.
A catalyst increases the efficiency of collisions between reactants.
a)
true
b)
false
48.

How does a catalyst work in speeding up a reaction?

a)

By lowering the activation energy or reaction

b)

by giving them more energy

c)

by making them more available

49.

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

a)

Biology

b)

Catalyst

c)

Chemical

d)

Enzyme

50.

A catalyst

a)

is used up

b)

is nevr used up

51.

Which of the reaction pathway shows the catalysed reaction?

a)

1

b)

2

52.

How does a catalyst work in speeding up a reaction?

a)

By lowering the activation energy or reaction

b)

by making them more available

c)

by giving them more energy

53.

A catalyst increases the efficiency of collisions between reactants.

a)

true

b)

false

54.

The minimum amount of energy needed for colliding particles to react is called the

a)

Chemical Energy

b)

Kinetic Energy

c)

Activation Energy

d)

Potential Energy

55.

A substance that increases the rate of a reaction without being used up during the reaction is called a

a)

catalyst

b)

product

c)

reactant

d)

solute

56.

When a catalyst is added to a reaction the rate of reaction,,,

a)

Increases

b)

Decreases

c)

Does not change

57.

A catalyst be regenerated or used again and again

a)

False

b)

True

58.

A catalyst changes the mechanism of the reaction

a)

True

b)

False

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