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8th Grade 2nd 6 weeks exam review #3

Total questions: 70

Worksheet time: 1hrs 28mins

Name
Class
Date
1.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
2.
Which of the following is a compound?
a)
Co
b)
O2
c)
C
d)
CO2
3.
How many atoms of carbon (C) are in C6H12O6?
a)
3
b)
6
c)
12
d)
24
4.
How many atoms of Oxygen are in Fe(NO3)3 ?
a)
6
b)
3
c)
9
d)
1
5.

Are there any compounds on the periodic table?

a)

yes there are many

b)

no because only elements are on the periodic table

c)

I think they are?

d)

there is no way to tell

6.

How many Hydrogen atoms are in 4H2O?

a)

6

b)

8

c)

2

d)

4

7.

How many Oxygen atoms are in H2O?

a)

1

b)

2

c)

0

d)

4

8.

How many Magnesium atoms are in 10MgCl2?

a)

10

b)

5

c)

20

9.

How many Sodium atoms are in 6NaCl?

a)

1

b)

12

c)

6

10.

What is C2H8O ?

a)

Element

b)

Letters

c)

Numbers

d)

Compound

11.

How many Aluminum atoms are in Al2O3?

a)

3

b)

2

c)

5

d)

1

12.

A subscript is the small number below the element symbol that tells the number of _______ of that element.

a)

atoms

b)

valence electrons

c)

protons

d)

elements

13.

How many atoms are there TOTAL in H2SO4 ?

a)

6

b)

5

c)

7

d)

3

14.

How many Nitrogen atoms are in (NH₄)₂CrO₄?

a)

1

b)

2

c)

8

d)

16

15.

How many atoms of Hydrogen are in this compound?

a)

1

b)

2

c)

3

d)

4

16.

How many Oxygen atoms are in Al₂(SO₄)₃?

a)

4

b)

12

c)

7

d)

24

17.

How many Hydrogen atoms in 3(NH₄)₂CrO₄?

a)

4

b)

2

c)

8

d)

24

18.

How many Nitrogen atoms are in the in H2C3O4N5?

a)

2

b)

3

c)

4

d)

5

19.

How many elements are present in this compound? (Careful!)

Mg2As3COHNi2

a)

2

b)

4

c)

6

d)

10

20.

How many atoms are present if there is no subscript following the element symbol?

a)

0

b)

2

c)

only 1

d)

1 million

21.

How many atoms of Hydrogen are in H2O

a)

1

b)

2

c)

3

d)

more than 3

22.

How many different elements are present in H2COCH2

a)

5

b)

4

c)

3

d)

2

23.

Calculate the number of Oxygen atoms in Al(OH)3

a)

1

b)

2

c)

3

d)

4

24.

The ______ are numbers found on the lower right-hand side of an element symbol.

a)

Coefficient

b)

Exponent

c)

Multiplier

d)

Subscript

25.

Coefficients in chemical formulas...

a)

Multiply just the first atom

b)

Add to the subscripts at the end of the molecule

c)

Multiply elements without subscripts

d)

Multiply EVERYTHING!

26.

4CF2Cl2

a)

C = 4, F = 4, Cl = 2

b)

C = 1, F = 8, Cl = 8

c)

C = 4, F = 8, Cl = 8

d)

C = 1, F = 4, Cl = 8

27.

C3H5(NO3)3

a)

C = 3, H = 5, N = 3, O = 9

b)

C = 3, H = 5, N = 1, O = 9

c)

C = 9, H = 15, N = 3, O = 9

d)

C = 9, H = 15, N = 1, O = 3

28.

H2SO4

a)

H = 2, S = 4, O = 4

b)

H = 2, S = 1, O = 4

c)

H = 8, S = 4, O = 4

d)

H = 2, SO = 4

29.

How many different elements are present in this molecule?

3 NH4C2H3O2

a)

15

b)

36

c)

5

d)

4

30.

A ______ is a number written in front of a chemical formula.

a)

Coefficient

b)

Subscript

c)

Exponent

d)

Coordinator

31.

How man atoms of carbon are there?

a)

1

b)

2

c)

3

d)

4

32.

How many atoms of Iron are in this compound?

a)

1

b)

2

c)

3

d)

4

33.

How many atoms of hydrogen are in

C6H12O6

a)

6

b)

12

c)

18

d)

2

34.

A substance made up of atoms of two or more different elements joined by chemical bonds

a)

Molecule

b)

compound

c)

polar covalent bond

d)

nonpolar covalent bond

35.

How many different elements are present in H2COCH2

a)

5

b)

4

c)

3

d)

2

36.

Calculate the number of Oxygen atoms in Al(OH)3

a)

1

b)

2

c)

3

d)

4

37.

How many total POTASSIUM atoms are in this formula?

a)

8

b)

2

c)

4

d)

12

38.

How many elements are in this chemical formula? NaHCO3NaHCO_3  

a)

1

b)

2

c)

3

d)

4

39.

Coefficients in chemical formulas...

a)

Multiply just the first atom

b)

Add to the subscripts at the end of the molecule

c)

Multiply elements without subscripts

d)

Multiply EVERYTHING!

40.

C3H5(NO3)3

a)

C = 3, H = 5, N = 3, O = 9

b)

C = 3, H = 5, N = 1, O = 9

c)

C = 9, H = 15, N = 3, O = 9

d)

C = 9, H = 15, N = 1, O = 3

41.
Can a same substance undergo both physical and chemical changes.
a)
True
b)
False
42.
How do we know if it is a chemical change?
a)
can be undone
b)
cannot be undone
c)
both
d)
none
43.
Physical changes size and shape of something?
a)
False
b)
True
44.
Ice can be a physical change?
a)
False
b)
True
45.
When something new is created or a substance is broken down into diffrent chemicals, you have a chemical change.
a)
True
b)
False
46.
What is photosynthesis?
a)
when energy is expose. 
b)
when water and oxygen is composed.
c)
when plants turn carbon dioxide and water into energy. 
d)
none
47.
What kind of properties can only be observed when a substance changes into a different substance?
a)
physical properties
b)
chemical properties
c)
liquid properties
d)
real properties
48.
Is hammering wood together to build a house a chemical or physical change?
a)
chemical
b)
physical
49.
Is burning wood a chemical or physical change?
a)
chemical
b)
physical
50.
Which is a physical change?
a)
burning match 
b)
vinegar in baking soda 
c)
melting butter
d)
cooking an egg
51.
What is an example of a Chemical change?
a)
Ripped paper 
b)
boiled egg
c)
cracked egg
d)
sugar in water
52.
Cutting a log in to small pieces is a chemical change.
a)
true
b)
false
53.
The melting of wax is an example of a
a)
chemical change
b)
physical change
54.
Digesting your food is an example of 
a)
chemical change
b)
physical change
55.
KMnO4
How many atoms of oxygen are in this molecule?
a)
1
b)
2
c)
4
d)
6
56.
Is milk going sour a physical or chemical change?
a)
Physical 
b)
Chemical
57.
Is gatorade powder dissolving in water physical or chemical change?
a)
Physical 
b)
Chemical
58.
Is the formation of the grand canyon a physical or chemical change?
a)
Physical 
b)
Chemical
59.
Rust on an iron bar is an example of chemical change.
a)
True 
b)
False
60.
Glass Breaking
a)
Physical
b)
Chemical
61.

A chemical change

a)

changes matter from one form to another.

b)

 destroys matter.

c)

creates matter

d)

does not change matter in any way.

62.

Which of the following is a physical change?

a)

 Iron is oxidized to iron oxide

b)

Aluminum metal is pounded into thin sheets

c)

Copper reacts with a strong acid

d)

Sodium metal explodes on contact with water

63.

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

a)

melting solid gold

b)

burning hydrogen gas

c)

dissolving sugar in water

d)

breaking a sheet of glass

64.

Which of the following is a common sign that a chemical change has occurred?

a)

A chemical has changed size.

b)

A chemical has changed to a different state (solid, liquid or gas)

c)

A chemical has become a different shape.

d)

A chemical has turned a different color.

65.

When silver metal comes in contact with sulfur, silver sulfide forms and the silver appears darker. This is a...

a)

 change of form

b)

chemical change

c)

 change of state

d)

physical change

66.

Two solutions are added together and the new solution becomes hot. This tells you that

a)

a gas is being produced.

b)

the solutions are not soluble. 

c)

the physical properties are the same.

d)

a chemical change is taking place.

67.

A solid brown metal is added to a clear acidic solution. A white powder appears and the acid solution becomes cloudy. Which type(s) of change have/has occurred?

a)

both chemical and physical

b)

only physical

c)

 neither chemical nor physical

d)

only chemical

68.

Jolene wants to experiment with sugar cubes. Which of the following causes a sugar cube to only change physically, not chemically?

a)

burning the sugar cube with a match

b)

crushing the sugar cube and dissolving it in water

c)

dehydrating the sugar cube with sulfuric acid

d)

chewing the sugar cube and digesting it

69.

A physical change occurs when…

a)

 both the appearance of a substance and its phase change.

b)

the appearance of a substance changes but its phase does not.

c)

the phase of a substance changes but its appearance does not.

d)

 neither the appearance of a substance nor its phase changes.

70.

Diane draws a picture on a piece of paper and then folds it into a paper airplane. She throws it at her little brother, and it hits him in the head. He responds by ripping up the paper. Which of the following is an example of a physical change?

a)

ripping up the paper

b)

folding the paper into an airplane

c)

drawing on the paper

d)

 all of these

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