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8.5DE Review

Total questions: 54

Worksheet time: 3590secs

Name
Class
Date
1.
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
2.
The number to the lower side of an element is a 
a)
Subscript
b)
Superscript
c)
Coefficient
d)
Charge
3.
The number in front of a compound or element is a 
a)
Subscript
b)
Coefficient
c)
Superscript
d)
Charge
4.
A chemical reaction is balanced when
a)
both sides have the same elements
b)
Both sides have the same  number of atoms
c)
Same subscripts
d)
Same coefficients
5.
Which of these is not a chemical reaction?
a)
Burning of wood
b)
Milk going bad
c)
Mixing vinegar and baking soda
d)
Melting of ice
6.
The coefficient in  3H2O is
a)
6
b)
2
c)
3
d)
5
7.
If reaction starts with 20g of reactants it should produce 
a)
a total of 40g of products
b)
a total of 10g of products
c)
a total of 80 g of products
d)
a total of 20g of products
8.
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
9.
Which are the reactants in the following reaction?
2Mg + O2 ---> 2MgO 
a)
Mg and O
b)
MgO
c)
Mg and MgO
d)
O and MgO
10.
How many oxygen atoms are in this chemical formula?
a)
6 oxygen atoms
b)
2 oxygen atoms
c)
3 oxygen atoms
d)
4 oxygen atoms
11.
Students react baking soda & vinegar.
Which of the following would provide the evidence that the number of atoms present before a chemical reaction is equal to the number of atoms present after the chemical reaction?
a)
The mass of the plastic bag, baking soda, and vinegar before the reaction was equal to the mass after the reaction.
b)
Bubbles were produced during the reaction, which meant that a gas was being produced.
c)
The plastic bag did not change in any way, indicating that it was not involved in the reaction.
d)
The mass of the baking soda was exactly equal to the mass of the vinegar used to create the chemical reaction.
12.
Which is Chemical Equation is Balanced?
a)
CH₄+O₂------CO₂+2H₂O
b)
H₂+O₂-----2H₂O₄
c)
4Al+3O₂-----2Al₂O₃
13.
Is this equation balanced or unbalanced? 
2Fe2O3 + 3C --> 4Fe + 3 CO2
a)
balanced
b)
unbalanced
14.
A precipitate is a 
a)
liquid that forms when two solids are reacted
b)
a solid that forms when two liquids are mixed
c)
a gas that forms when vinegar and baking soda react
d)
a change of color in a solution
15.

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

a)

A

b)

B

c)

C

d)

D

16.

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

a)

A

b)

B

c)

C

d)

D

17.

True or False

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

a)

True

b)

False

18.

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

a)

3,4

b)

3,2

c)

2,4

d)

6

19.

The Coefficient (3) in the Chemical Formula, 3H2O, tells you how many _____________ there are.

a)

Atoms of Hydrogen

b)

Atoms of Oxygen

c)

Atoms of Water

d)

Molecules of Water

20.

The Subscript (2) in the Chemical Formula, 3H2O, tells you how many _____________ there are.

a)

Atoms of Hydrogen

b)

Atoms of Oxygen

c)

Atoms of Water

d)

Molecules of Water

21.
How many nitrogen atoms does NH3 have?
a)
1
b)
2
c)
3
d)
4
22.

Which Chemical Equation is Balanced?

a)

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

b)

2H2+O2-----2H2O

c)

3Cr+4O₂-----2Cr₂O₃

23.

Which Chemical Equation is Balanced?

a)

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

b)

4H2+O2-----2H2O2

c)

3Cr+4O₂-----2Cr₂O₃

24.

How many Sulfur atoms are present in the reactants of the following equation: 2SO2 + 2H2O2 ----> 2H2SO4

a)

2

b)

3

c)

4

d)

8

25.

How many Oxygen atoms are present in the product of the following equation: 2SO2 + 2H2O2 ----> 2H2SO4

a)

2

b)

3

c)

4

d)

8

26.

How many Hydrogen atoms are present in the product of the following equation: 2SO2 + 2H2O2 ----> 2H2SO4

a)

2

b)

3

c)

4

d)

8

27.
The number of atoms of  N (nitrogen) in 3N2O5 is
a)
2
b)
5
c)
6
d)
15
28.

In the chemical formula C12H22O11C_{12}H_{22}O_{11}  , how many elements are there?

a)

1

b)

2

c)

3

d)

4

29.

In the chemical formula C12H22O11C_{12}H_{22}O_{11}  , how many C atoms are there?

a)

12

b)

22

c)

11

d)

45

30.

In the chemical formula C12H22O11C_{12}H_{22}O_{11}  , how many O atoms are there?

a)

12

b)

22

c)

11

d)

45

31.

In the chemical formula C12H22O11C_{12}H_{22}O_{11}  , how many H atoms are there?

a)

12

b)

22

c)

11

d)

45

32.

What is the TOTAL number of atoms in the chemical formula C12H22O11C_{12}H_{22}O_{11}  ?

a)

12

b)

22

c)

11

d)

45

33.

Which of the following substances CANNOT be broken down into simpler substance? ?

a)

NaNa  

b)

H2OH_2O  

c)

C6H12O6C_6H_{12}O_6  

d)

COCO  

34.
Sodium Hydroxide dissolves in water
a)
Chemical Change
b)
Physical Change
35.
Hydrochloric acid reacts with potassium hydroxide to produce a salt, water,and heat.
a)
Chemical Change
b)
Physical Change
36.
A pellet of sodium is sliced in two
a)
Chemical change
b)
Physical Change
37.
Potassium chlorate decomposes to potassium chloride and oxygen gas.
a)
Chemical Change
b)
Physical Change
38.
Iron rusts.
a)
Chemical change
b)
Physical Change
39.
When placed in H20, a sodium pellet catches on fire as hydrogen gas is liberated and sodium hydroxide forms.
a)
Chemical Change
b)
Physical Change
40.
Evaporation
a)
Chemical Change
b)
Physical Change
41.
Ice Melting
a)
Chemical Change
b)
Physical Change
42.
Milk Sours
a)
Chemical Change
b)
Physical Change
43.
Sugar dissolves in water
a)
Chemical Change
b)
Physical Change
44.
Pancakes cooking on a griddle
a)
Chemical Change
b)
Physical Change
45.
Food is digested in the stomach
a)
Chemical Change
b)
Physical Change
46.
Which of the following is a Physical Property 
a)
Toxicity
b)
Flammability
c)
Malleability
d)
Reactivity
47.
Evidence of a physical change.
a)
New substance
b)
Shape Change
c)
Light produced
d)
Gas released.
48.
Any change in the state of matter of a substance is a...
a)
Physical Change
b)
Chemical Change
49.

1. The Best Friend's Club uses "invisible ink" to write notes to each other. The invisible ink is actually lemon juice that is clear when it dries on paper, but turns brown when a club member holds a burning candle under the paper. Once it is heated, it is never invisible again.

What type of change is occurring when the paper is heated?

a)

Chemical Change

b)

Physical Change

c)

Elemental Change

d)

Temperature Change

50.

A student mixes two clear liquids together. After a few minutes, a white powdery solid can be seen settling on the bottom of the test tube. Which of the following is a conclusion that the student can draw based on these observations? The two clear liquids-

a)

were pure substances before they were mixed

b)

are toxic and should be handled with extreme caution

c)

have gone through a chemical change in which a new substance called a precipitate was produced

d)

have been stored too long and are no longer good

51.

A student added white crystals to a clear liquid. The crystals dissolved in the liquid. After a few seconds, the liquid became quite warm and then turned bright red in color. Indications that a chemical change was taking place could be observed when –

a)

the white crystals were added to the clear liquid.

b)

the crystals dissolved in the liquid leaving only the liquid visible

c)

There are no indications of chemical change

d)

the temperature of the liquid increased and an unexpected color change occurred.

52.

A student observes some sugar as it is heated and burns. The student concludes that a chemical reaction has occurred. Which of the following observations about the burning sugar provides evidence of a chemical reaction?

a)

Heat is added to the sugar crystals.

b)

The sugar melts and becomes a liquid.

c)

Gas is produced as the sugar turns black.

d)

No evidence of chemical reaction is present.

53.

Bethany had a beaker with a small amount of baking soda. She added a few drops of pickle juice to the baking soda and observed fizzing and bubbling. Based on her observation, which of these can Bethany determine about the new substance formed by mixing the baking soda and pickle juice?

a)

A chemical reaction produced a solid.

b)

A chemical reaction produced a gas.

c)

No chemical reaction took place.

d)

Only a physical change happened.

54.

Olivia had a beaker with a small amount of baking soda. She added a few drops of vinegar to the baking soda and observed fizzing and bubbling. Based on her observation, which of these can Vanessa determine about the new substance formed by mixing the baking soda and vinegar?

a)

It was hot.

b)

It was a gas.

c)

It was magnetic.

d)

It was a conductor

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