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Unit 3 Chemistry Part 2 Review Wayground Gregg

Total questions: 176

Worksheet time: 4hrs 14mins

Name
Class
Date
1.
1. Using the table below, determine how many grams of H2O will be present at the end of the reaction?
4 lines
2.
2. State the Law of Conservation of Mass.
4 lines
3.
3. If you start a chemical experiment with 67 grams of Aluminum and 54 grams of Hydrochloric Acid how much Aluminum Chloride and Hydrogen should you end with?
4 lines
4.
4. If you are conducting a chemical reaction that demonstrates the law of conservation, but one of the products is a gas, how can you ensure that the amount of gas is included in your final amount of mass?
4 lines
5.
5. According to the law of conservation of mass, if you begin with 131 g of copper and an unknown amount of oxygen and the reaction produces 175 grams of Copper (III) Oxide (Cu2O3), how much Oxygen did you start with?
4 lines
6.
6. Asking yourself if new matter was formed is the best way to determine that a ____________ change has occurred.
a)
physical
b)
phase
c)
state
d)
chemcial
7.
7. In the procedure shown above, a calcium chloride solution is mixed with a sodium sulfate solution to create the products shown. Which of the following is illustrated by this activity?
a)
The theory of thermal equilibrium
b)
The law of conservation of mass
c)
The law of conservation of momentum
d)
The theory of kinetic energy
8.
8. Does this equation demonstrate the Law of Conservation of Mass?
a)
Yes
b)
No
9.
9. Does this equation demonstrate the Law of Conservation of Mass?
a)
Yes
b)
No
10.
10. Does this equation demonstrate the Law of Conservation of Mass?
a)
Yes
b)
No
11.
11. Ling is learning about chemical reactions in science class. She measured out 45 grams of vinegar and 10 grams of baking soda. When she mixed them together, a bubbling reaction occurred. After the reaction stopped, she weighed the mixture and found that it weighed 54 grams. Which of the following best explains why the mixture weighed less than the original ingredients?
a)
Some of the vinegar evaporated during the experiment.
b)
The chemical reaction created a gas that left the mixture.
c)
The new solution is less dense than vinegar or baking soda.
d)
The baking soda is floating on top of the vinegar.
12.
12. Chemical equations should be balanced so that they demonstrate the law of conservation of mass. Which of the following statements about balanced chemical equations is correct?
a)
The products must contain the same numbers and types of atoms as the reactants.
b)
The products must contain the same arrangement of atoms as found in the reactants.
c)
The products must contain the same numbers but not the same types of atoms as the reactants.
d)
The products must contain the same types but not the same numbers of atoms as the reactants
13.
13. Which of the following is a balanced equation?
a)
Option 1
b)
Option 2
c)
Option 3
d)
Option 4
14.
14. What number should be in front of O 2 to balance the equation?
a)
1
b)
2
c)
3
d)
4
15.
15. Which chemical reaction supports the law of conservation of matter?
a)
K + 2MgBr → KBr + 2Mg
b)
K + MgBr → KBr + Mg
c)
2K + 2MgBr → KBr + 2Mg
d)
2K + MgBr → 2KBr + Mg
16.
16. Look at the following chemical equation. What is true about this chemical equation?
a)
It is balanced because the mass of the reactants is equal to the mass of the products.
b)
It is unbalanced because the mass of the reactants is greater than the mass of the products.
c)
It is unbalanced because the sum of the coefficients of the reactants is greater than the sum of the coefficients of the products.
d)
It is balanced because the sum of the coefficients of the reactants is greater than the sum of the coefficients of the products.
17.
17. Meredith mixes 5 grams of baking soda with 5 grams of vinegar in an unsealed test tube. She then weighs the product and finds it to weigh 9 grams. Mathew conducts the same experiment, except in a sealed bag. He finds that mixing 5 grams of baking soda with 5 grams of vinegar yields 10 grams of product. Which of the following might account for their different findings?
a)
Some of the mass from the test tube was destroyed.
b)
Some of the mass of the reactants was converted to light.
c)
Some of the mass escaped from the test tube as a gas before it was massed.
d)
Some of the mass was created during the reaction between vinegar and baking soda in the bag
18.
18. Why should a chemical equation be balanced?
a)
to show that the reactants are compounds
b)
to show metals from nonmetals
c)
to show the law of conservation of mass
d)
to show ionic compounds
19.
19. Fernando places 50 mL of HCl in a 100 mL beaker and 50 mL of NaOH in a 100 mL beaker. He places them on a scale together and measures a combined mass of 15.00 grams. Then he mixes the liquids together and waits five minutes while they react. After the HCl and NaOH react, Fernando measures the mass again. Using the mass before the reaction in the diagram, what is the mass after the reaction?
a)
30.0 grams
b)
15.0 grams
c)
5.0 grams
d)
15.0 kg
20.
20. Which of the following chemical equations is balanced correctly?
a)
Option 1
b)
Option 2
c)
Option 3
d)
Option 4
21.

Which of the following best demonstrates the law of conservation of mass during a chemical reaction?

a)

The total mass of the products is greater than the total mass of the reactants.

b)

The total mass of the products is double the mass of the reactants.

c)

The total mass of the products is equal to the total mass of the reactants.

d)

The total mass of the products is less than the total mass of the reactants.

22.

A student mixes two clear solutions in a sealed container and observes the formation of a solid and a gas. After the reaction, the mass of the sealed container and its contents is measured. What should the student expect?

a)

The mass will decrease because a gas was produced.

b)

The mass will increase because a solid was formed.

c)

The mass will remain the same as before the reaction.

d)

The mass will double due to the reaction.

23.

Why is it important to conduct experiments in a closed system when investigating the law of conservation of mass?

a)

To prevent the loss of mass as gases or vapors.

b)

To increase the rate of the chemical reaction.

c)

To ensure the reactants mix more thoroughly.

d)

To change the color of the products.

24.

When a liquid reaches the temperatures of its ___, it can become a gas.

a)
melting point
b)
freezing point
c)
boiling point
d)
density
25.

When a solid reaches the temperatures of its ___, it can become a liquid.

a)

melting point

b)

freezing point

c)

boiling point

d)

density

26.

When a liquid reaches the temperatures of its ___, it can become a solid.

a)

melting point

b)

freezing point

c)

boiling point

d)

density

27.

Which of the following objects is not an electrical conductor?

a)

Paper clip

b)

Coin

c)

Eraser

d)

Iron nail

28.

Select specific properties that are observed by your senses

a)

Smell

b)

Density

c)

Texture

d)

Color

29.

A glass marble and a piece of cork of the same shape and size are dropped in water. Which of the following explains correctly why the glass marble sinks while the cork piece floats on water?

a)

The glass marble is denser than water while the cork is less dense than water.

b)

The glass marble is less dense than water while the cork is denser than water.

c)

The glass marble and the cork are both denser than water.

d)

The glass marble and the cork are both less dense than water.

30.

Which is a size-dependent (Non-characteristic) property?

a)

Weight

b)

conductivity

c)

solubility

d)

melting/boiling point

31.

Which is a size-independent (characteristic) property?

a)

Mass

b)

Color

c)

volume

d)

Density

32.
What must be in metal for it to stick to a magnet?
a)
soy sauce
b)
copper
c)
iron
d)
aluminum
33.

A characteristic of matter that can be observed without changing the identity of the matter is a physical property.

a)

True

b)

False

34.

Weight is the amount of matter in an object.

a)

True

b)

False

35.

The ability to conduct electric current is referred to as...

a)

density

b)

solubility

c)

malleability

d)

electrical conductivity

36.
At higher temperatures
a)
particles in an object have less energy
b)
particles in an object move faster
c)
a gas contracts
37.
Which method of separating mixtures
would you use to separate salt from a
saltwater solution?
a)
magnetic attraction
b)
filtration
c)
distillation
d)
evaporation
38.
Boiling point,melting point, and density are some of an element's
a)
pure properties
b)
physical properties
c)
chemical properties
39.

​ (a)   is soluble in water.

Choose from the below words
Sugar
Vegetable Oil
Corn Starch
Dish soap
Sand
40.

Which are examples of thermal conductors?

a)

cotton and polyester

b)

copper, aluminum and iron

c)

wood and rubber

d)

glass and plastic

41.

If you travel to the moon will your mass be greater than, less than, or the same as on Earth?

a)
greater
b)
same
c)
less
d)
What?!
42.

The ability to burn is known as---

a)

Flammability

b)

Combustion

c)

Density

d)

Exploding

43.

Mass divided by volume is the formula for calculating----

a)

Mass

b)

Volume

c)

Density

d)

Matter

44.

Reactivity (bubbling, fizzing) is a --- property.

a)

Chemical

b)

Physical

45.
Ice melting is an example of a
a)
physical change
b)
chemical change
c)
physical property
d)
chemical property
46.
Which of the following is not a chemical property? 
a)
rusting 
b)
boiling 
c)
rotting 
d)
burning 
47.
Which one of these is a chemical property?
a)
melting point
b)
boiling point
c)
color
d)
flammability
48.
Ability to rust is this type of property:
a)
Physical property
b)
Chemical property
49.
Which is an example of a physical property?
a)
ability to react with acid
b)
 state of matter
c)
flammability
d)
ability to react with oxygen
50.
Which of the following is a chemical change?
a)
human digestion
b)
cutting a tree down
c)
melting a chocolate bar
d)
Has a density of 1 gm/mL
51.

The melting point in degrees Celsius is---

a)

100

b)

32

c)

0

d)

212

52.
What are the products of the chemical reaction pictured?
a)
CH4 and CO2
b)
CH4 and O2
c)
CO2 and H2O
d)
O2 and H2O
53.
Consider the chemical equation CH4 + 2 O2 → CO2 + 2 H2O. In this equation, CH4 is a
a)
product
b)
reactant
c)
displacement
54.
What is the left part of a chemical equation called?
H2 + O → H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
55.
What is the right part of a chemical equation called?
H2 + O → H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
56.

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.

57.
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.
58.
What is the little number after an element in a chemical equation called.
Example: H2
a)
Coefficient 
b)
Subscript
c)
Atom
d)
Equation
59.
What coefficient should be used to make the following equation balanced?
N2+O2--> _NO 
a)
1
b)
2
c)
3
d)
4
60.
How many HCl molecules do you need to balance this equation? 
Mg +  __HCl --->  MgCl2 + H2
a)
1
b)
2
c)
3
d)
4
61.
Is this balanced?
Al + O2 → 2Al2O3
a)
Yes
b)
No
62.

What chemical property describes a substance's ability to burn?

a)

Flammability

b)

Reactivity

c)

pH

63.

What chemical property describes a substance's ability to combine and form one or more new substances?

a)

Flammability

b)

Reactivity

c)

pH

64.

Alka Seltzer tablets fizz and bubble when placed in water. This is an example of what chemical property?

a)

Flammability

b)

Reactivity

c)

pH

65.

Rusting demonstrates what chemical property?

a)

Flammability

b)

Reactivity

c)

pH

66.

Putting ketchup on a penny demonstrates what chemical property?

a)

Flammability

b)

Reactivity

c)

pH

67.

True or False.

Cooking is always a chemical change.

a)

True

b)

False

68.

Frying an egg is a chemical change. Which of the following sign(s) indicate that a chemical change occurred?

a)

An unexpected change in color

b)

Change in odor

c)

Production of heat and/or smoke

d)

Fizzing, bubbling, and/or foaming

e)

Sound and/or light being given off

69.

Mixing baking soda and vinegar is a chemical change. Which of the following sign(s) indicate that a chemical change occurred?

a)

An unexpected change in color

b)

Change in odor

c)

Production of heat and/or smoke

d)

Fizzing, bubbling, and/or foaming

e)

Sound and/or light being given off

70.

Burning paper is a chemical change. Which of the following sign(s) indicate that a chemical change occurred?

a)

An unexpected change in color

b)

Change in odor

c)

Production of heat and/or smoke

d)

Fizzing, bubbling, and/or foaming

e)

Sound and/or light being given off

71.

What are the six signs that a chemical change is occurring? Provide an example of a different reaction for each of the indicators you describe.

4 lines
72.

Describe THREE physical properties of the car pictured above. What has happened to the car? Why? Is this an example of a physical change or a chemical change? Explain.

4 lines
73.

A class observes a tree being cut with a chain saw. A student concluded that since it is impossible to put the tiny wood chips back together and the process cannot be reversed, that cutting trees with chain saws causes a chemical change in the wood. Is the student's conclusion accurate? Explain your answer.

4 lines
74.

What kind of properties of matter can we observe with our senses and can determine without destroying matter?

a)

physical

b)

chemical

c)

astronomical

d)

astrological

75.

This type of property can be indicated by how it reacts with something else and if it was changed into a new substance after the reaction.

a)

private

b)

real estate

c)

chemical

d)

physical

76.

Which of the following is a physical property of matter?

a)

flammability

b)

luster

c)

reacts with air

d)

reacts with acid

77.

which of the following is a chemical property of matter?

a)

reacts with water

b)

density

c)

sour taste

d)

solubility

78.

A change in size, shape, or state of matter is a ____________ change

a)

animatronic

b)

mental

c)

chemical

d)

physical

79.

If no new substance was formed, what kind of reaction/change was it?

a)

electronic

b)

physical

c)

extraordinary

d)

chemical

80.

A __________ change has occurred if a new substance was formed from the reaction.

a)

protonic

b)

subtropic

c)

chemical

d)

physical

81.

What kind of change occurred if there was a change in the chemical and physical properties of the reactants?

a)

physical

b)

chemical

c)

PE

d)

evaporative

82.

These are all examples of............?

melting point~solubility~odor

a)

atomic properties

b)

chemical properties

c)

physical properties

d)

commercial properties

83.

You go into your fridge and take a sip of milk from the carton and it tastes disgusting (the milk soured)

a)

chemical property

b)

chemical change

c)

physical property

d)

physical change

84.

You get home and you decide to cut an apple into slices to eat as a snack

a)

chemical change

b)

physical physical

c)

physical property

d)

physical change

85.

You have a sore throat and you heard dissolving salt in warm water will ease the pain.

a)

physical change

b)

physical property

c)

chemical change

d)

chemical property

86.

you go outside and notice the iron (Fe) plant hanger has rusted

a)

physical change

b)

physical property

c)

chemical change

d)

chemical property

87.

An ice cube is placed in the sun. Later there is a puddle of water. Later still the puddle is gone.

a)

physical change

b)

chemical change

88.

Two chemical are mixed together and a gas is produce.

a)

physical change

b)

chemical change

89.

A solid is crushed to a powder.

a)

physical change

b)

chemical change

90.

Two substances are mixed and light is produced.

a)

chemical change

b)

physical change

91.

Chocolate syrup is dissolved in milk.

a)

physical change

b)

chemical change

92.

A marshmallow is toasted over a campfire.

a)

chemical change

b)

physical change

93.

Mixing salt and pepper.

a)

physical change

b)

chemical change

94.

cooking an egg for breakfast

a)

physical change

b)

chemical change

95.

grass grows

a)

chemical change

b)

physical change

96.

You blow dry your wet hair. Which of the following are evidence for a physical change? (choose all that apply)

a)

No change in substances.

b)

No unexpected color change, temperature change or gas given off

c)

Identity of a substance change

d)

Silver oxide produced

97.

You forgot to dry the bread knife when you washed it and reddish brown spots appeared on it. Which of the following is evidence for a chemical change? (choose all that apply)

a)

gas is produced

b)

Identity of a substance change

c)

Iron in knife forms rust

d)

no change in substances

98.

In a fireworks show, the fireworks explode giving off heat and light. Which of the following is evidence for a chemical change?

a)

Identity of substances change.

b)

No unexpected color change, temperature change or gas given off.

c)

No unexpected color change.

d)

Fireworks combust making new products and energy (heat/light).

99.

A straight piece of wire is coiled to form a spring. Which of the following are evidence for a physical change? (choose all that apply)

a)

Identity of substances change.

b)

Gas is produced

c)

No change in substances.

d)

No unexpected color change, temperature change or gas given off.

100.

Changing the size and shapes of pieces of wood would be a chemical change.

a)

true

b)

false

101.

In a physical change, the makeup of matter is changed.

a)

True

b)

False

102.

Evaporation occurs when liquid water changes into a gas.

a)

true

b)

false

103.

Evaporation is a physical change.

a)

true

b)

false

104.

Burning wood is a physical change.

a)

true

b)

false

105.

Combining hydrogen and oxygen to make water is a physical change.

a)

true

b)

false

106.

Breaking up concrete is a physical change.

a)

true

b)

false

107.

Sand being washed out to sea from the beach is a chemical change.

a)

true

b)

false

108.

When ice cream melts, a chemical change occurs.

a)

true

b)

false

109.

Acid rain damaging a marble statue is a physical change.

a)

true

b)

false

110.

Anthony is performing an experiment. He adds 0.25 grams of baking soda to 5 grams of water and stirs. Anthony watches as the baking soda dissolves in the water. If Anthony weighs the water and baking soda solution, what will its mass be?

a)

4.75 grams

b)

5.25 grams

c)

5.0 grams

d)

7.5 grams

111.

Matter can not be created nor destroyed: it can only be

a)

Destroyed a little bit

b)

Invisible

c)

Transformed, changed

d)

None of the above

112.

If reaction starts with 20g of reactants it should produce 

a)

a total of 40g of products

b)

a total of 80 g of products

c)

a total of 10g of products

d)

a total of 20g of products

113.

Which of the models of a chemical reaction best represents the Law of Conservation of Mass?

a)

A

b)

B

c)

C

d)

D

114.

Which of the models of a chemical reaction best represents the Law of Conservation of Mass?

a)

A

b)

B

c)

C

d)

D

115.

Which of the following is an open system?

a)

A

b)

B

c)

C

d)

D

116.

Which of the following is close system?

a)

A

b)

B

c)

C

d)

D

117.

Which of the models of a chemical reaction best represents the Law of Conservation of Mass?

a)

A

b)

B

c)

C

d)

D

118.

Q. 

True or False

The mass of the reactants in a chemical equation must equal the mass of the products.

a)

TRUE

b)

FALSE

119.

A student heated a 10 gram sample of a chemical in an open container. A chemical reaction occurred, and the mass of the sample was measured again. The mass of the sample was found to be less than before the reaction. Which of the following best explains the decrease in mass of the sample?

a)

The heat caused the chemical to become less dense.

b)

Some of the lighter particles were destroyed.

c)

The reaction gave off more heat than was added.

d)

Some of the particles escaped as a gas formed.

120.

A chemical reaction that releases energy _________ and a chemical reaction that absorbs energy is called _____________.

a)

exothermic; endothermic

b)

endothermic; exothermic

c)

exothermic; accumulative

d)

liberal; endothermic

121.

A system where only energy can be exchanged but not matter

a)

Close system

b)

Open system

122.

A system which can be exchange both matter and energy with the surrounding.

a)

Close system

b)

Open system

123.

Q. 

True or False

In a chemical reaction there is always ONE product.

a)

TRUE

b)

FALSE

124.

In combustion reaction what element is always the reactant

a)

Oxygen

b)

Carbon

c)

Gold

d)

Helium

125.

If a reaction starts with a total 54g of reactants it should produce 

a)
a total of 40g of products
b)

a total of 54g of products

c)
a total of 180 g of products
d)
None of the above
126.

O + H2 → H2O

32 g of Oxygen completely reacts with 8 g of Hydrogen to produce _____ g of water.

a)

8

b)

12

c)

24

d)

40

127.

Mg + F → MgF

24 g of magnesium reacts with 38 g of fluorine to produce _____ g magnesium fluoride.

a)
62 
b)
38
c)
24
d)
14
128.

How many elements does PbNO7 have?

Hint: Every capital letter😉

a)
2
b)
3
c)
4
d)
5
129.
How many nitrogen atoms does NH3 have?
a)
1
b)
2
c)
3
d)
4
130.

Substances present at the start of a chemical reaction are called ____.

a)
subscripts
b)
coefficients
c)
reactants
d)
products
131.

Substances that form as the result, or at the end, of a chemical reaction are called ____.

a)
products
b)
reactants
c)
coefficients
d)
subscripts
132.

How many iron (Fe) atoms are in 
Fe(NO3)2

a)
1
b)
2
c)
3
d)
6
133.

How many nitrogen (N) atoms are in 
Fe(NO3)2

a)
1
b)
2
c)
3
d)
6
134.

How many oxygen (O) atoms are in 
Fe(NO3)2

a)
1
b)
2
c)
3
d)
6
135.
Matter can not be created nor destroyed: it can only be
a)
Destroyed a little bit
b)
Invisible
c)

Transformed, rearranged

d)
None of the above
136.

Label the reactants and products of the chemical reaction shown.

a)

Reactants

b)

Products

1
2
1)
2)
137.

Label the reactants and products in the chemical equation shown.

a)

Reactants

b)

Products

1
2
1)
2)
138.

What are the reactants in this chemical equation?

a)

6 CO2 + 6 H2O

b)

H2O

c)

C6H12O6

d)

C6H12O6 + O2

139.

What are the products in this chemical equation?

a)

CO2 + H2O

b)

H2O

c)

C6H12O6

d)

C6H12O6 + O2

140.

Select the chemical formula for this molecule?

a)

B1F3

b)

BF

c)

BF3

d)

FB

141.

How many atoms of hydrogen are in

C6H12O6

a)

6

b)

12

c)

18

d)

2

142.

Examine the experiment shown, then fill in the blanks.

The experiment shows a ​ (a)   system.

The mass at the end of the experiment will be ​ (b)   the initial mass.

Choose from the below words
closed
open
equal to
less than
greater than
143.

How many grams of Zn(NO3)2 was produced?

a)

3 g

b)

4 g

c)

0 g

d)

5 g

144.

If AB is 18 grams and reacts in a closed system, which of the following could be the grams of A and B?

a)

A is 13 grams and B is 2 grams

b)

A is 18 grams and B is 5 grams

c)

A is 9 grams and B is 11 grams

d)
A is 12 grams and B is 6 grams
145.

What is the Law of Conservation of matter?

a)

Matter is created in a chemical reaction

b)

Matter is created in a physical change

c)

New chemicals formed from a chemical reaction have a larger overall matter than the original reactants

d)

Matter is never created or destroyed

146.
An oreo cookie weighs 20 grams.  It gets crushed into crumbs for a recipe.  How much do its crumbs weigh?
a)
15 grams
b)
25 grams
c)
20 grams
147.

If the mass of a chemical reaction's product is 15 grams, what would the mass of the reactants be?

a)

20 g

b)

15 g

c)

10 g

d)

3 g

148.

Why does this picture demonstrate the Law of Conservation of Matter?

a)

the number of atoms of each element are the same on both sides

b)

they start out separate and end up combined

c)

the same elements are used

d)

it doesn't demonstrate the Law of Conservation of Matter

149.

If a chemical reaction occurs in a closed system (no way for any part of the reaction to escape), how does the product mass compare to the reactant mass?

a)

the mass would decrease

b)

the mass would increase

c)

the mass would stay the same

d)

it depends on the type of reaction

150.

If a chemical reaction occurs in an open system (not contained), what might happen to the measurable mass of the products when compared to the reactants?

a)

the measurable mass might decrease because any gas produced can escape (the actual mass would stay the same)

b)

the mass would increase because mass was created

c)

the measurable mass would stay the same because nothing would be able to leave the system.

d)

it depends on the type of reaction

151.

Which picture below would correctly demonstrate the Law of Conservation of Matter if this picture is the reactants?

a)
b)
c)
d)
152.
The Law of Conservation of matter states that the total amount of matter ______________ after it undergoes change.
a)
disappears
b)
stays the same
c)
weighs less
d)
explodes
153.
An oreo cookie weighs 20 grams.  It gets crushed into crumbs for a recipe.  How much do its crumbs weigh?
a)
15 grams
b)
25 grams
c)
20 grams
154.
What is the Law of Conservation of mass?
a)
Mass is created in a chemical reaction
b)
Mass is created in a physical change
c)
New chemicals formed from a chemical reaction have a larger overall mass than the original reactants
d)
Mass is never created or destroyed
155.
The coefficient in  3H2O is
a)
6
b)
2
c)
3
d)
5
156.

Which of the following are Subscripts in this Chemical Formula: 3Fe2O4

a)

3,4

b)

3,2

c)

2,4

d)

6

157.

Which Chemical Equation is Balanced?

a)

Fe4+O2------4FeO2+O2

b)

2H2+O2-----2H2O

c)

3Cr+4O₂-----2Cr₂O₃

158.

Which Chemical Equation is Balanced?

a)

4O2 + 2H2 + S2------ 2H2SO4

b)

4H2+O2-----2H2O2

c)

3Cr+4O₂-----2Cr₂O₃

159.
Which side of a chemical equation is the reactant side?
a)
Left (before the yields sign)
b)
Right (after the yields sign)
160.
Which side of a chemical equation os the product side?
a)
Left (before the yields sign)
b)
Right (after the yields sign)
161.
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.
162.
Is the equation balanced?: 2H2O + O2 --> 4MgO + 3Fe
a)
Yes
b)
No
163.
What is the left part of a chemical equation called?
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
164.

What is the right part of a chemical equation called?

2H2 + O2 --> 2H2O

a)

Reactants

b)

Products

c)

Yields

d)

Chemical Equation

165.

Based on the Law of Conservation of Matter, describe the relationship between the mass of the reactants and the mass of the products.

a)

The mass of the products is always greater than the mass of the reactants.

b)

The mass of the reactants is less than the mass of the products.

c)

The mass of the reactants equals the mass of the products.

d)

The mass of the reactants is greater than the mass of the products.

166.

If the mass of a chemical reaction's product is 15 grams, what would the mass of the reactants be?

a)

20 g

b)

15 g

c)

10 g

d)

3 g

167.

Which section represents the reactants?

a)

A

b)

B

c)

C

168.

Which section represents the products?

a)

A

b)

B

c)

C

169.

Which section represents the yield sign?

a)

A

b)

B

c)

C

170.

Why does this picture demonstrate the Law of Conservation of Mass?

a)

the number of atoms of each element are the same on both sides

b)

they start out separate and end up combined

c)

the same elements are used

d)

it doesn't demonstrate the Law of Conservation of Mass

171.

If a chemical reaction occurs in an open system (not contained), what might happen to the measurable mass of the products when compared to the reactants?

a)

the measurable mass might decrease because any gas produced can escape (the actual mass would stay the same)

b)

the mass would increase because mass was created

c)

the measurable mass would stay the same because nothing would be able to leave the system.

d)

it depends on the type of reaction

172.

Which picture below would correctly demonstrate the Law of Conservation of Matter if this picture is the reactants?

a)
b)
c)
d)
173.

In a balanced chemical equation, if there are 4 Hydrogen in the reactants, how many Hydrogen should be in the product?

a)

1

b)

2

c)

3

d)

4

174.

Which of the following would represent a mixture?

a)
b)
c)
175.

Which of the following would represent a compound?

a)
b)
c)
176.

Which of the following would represent an element?

a)
b)
c)

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