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Chemistry 2 test review

Total questions: 42

Worksheet time: 43mins

Name
Class
Date
1.
How many Hydrogen are in 4H2O?
a)
6
b)
8
c)
2
d)
4
2.
2H2 + O2 ----> 2H2O What is the product?
a)
------>
b)
2H2O
c)
2H2+ O2
3.
2H2 + O2 --------> 2H2O What  are the reactants?
a)
----->
b)
2H2O
c)
2H2 +O2
4.
How many O's are in Al₂(SO₄)₃
a)
4
b)
12
c)
7
d)
24
5.
How many atoms are there TOTAL in:
H2SO4
a)
6
b)
5
c)
7
d)
3
6.
Number of N in (NH₄)₂CrO₄
a)
1
b)
2
c)
8
d)
16
7.

Molecules that are made of more than one type of atom are called?

a)

Molecules

b)

Elements

c)

Mixtures

d)

Compounds

8.

How many elements are in this chemical formula? NaHCO3NaHCO_3  

a)

1

b)

2

c)

3

d)

4

9.

What is C2H8O ?

a)

Element

b)

Letters

c)

Numbers

d)

Compound

10.

What does the subscript in a chemical formula tell you?

a)

How many molecules are present

b)

How many atoms are present

c)

How many elements are present

d)

How many neutrons are present

11.

We breathe oxygen. Its chemical formula is O2. Is this formula an element or a compound?

a)

element

b)

compound

c)

neither

d)

both

12.
The red numbers in the image below represent ________
a)
subscripts
b)
coefficients
c)
I don't know, and don't want to try
d)
None of the answers are correct
13.
The blue numbers in the image below represent ________
a)
I don't know, and don't want to try
b)
coefficients
c)
subscripts
d)
none of the answers are correct
14.

How many Carbons are in 3CO2?

a)

3

b)

6

c)

2

15.

Balanced or Not?


H2 + Cl2 ---> 2HCl

a)

Balanced

b)

Unbalanced

16.

Balanced or Not?


H2 + O2 ---> H2O

a)

Balanced

b)

Not

17.

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

18.
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
19.
If a reaction starts with a total 75g of reactants it should produce 
a)
a total of 40g of products
b)
a total of 75g of products
c)
a total of 180 g of products
d)
None of the above
20.
24 g of magnesium reacts with 38 g of fluorine to produce _____ g magnesium fluoride
a)
62 
b)
38
c)
24
d)
14
21.
What is the arrow in a chemical equation...
H2 + O --> H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
22.
What is the part of the chemical equation in green called? 
Fe + S --> FeS
a)
products
b)
reactants
c)
yield
d)
chemical formula
23.

A ___ change causes the substance to change to a new substance with different properties.

a)

Physical

b)

Chemical

24.

A ____ change only changes the look of the substance but NOT the chemical make-up.

a)

Physical

b)

Chemical

25.

Water + Kool-aid Powder.

Is it a physical or chemical change?

a)

Physical

b)

Chemical

26.

The metal is rusting.

Is it a physical or chemical change?

a)

Physical

b)

Chemical

27.
a)
Element
b)
Compound
c)
Mixture of compound and element
d)
Mixture of two elements
28.
This diagram represents a _____.
a)
pure substance that is a compound
b)
mixture of elements
c)
pure substance that is an element
d)
mixture of compounds
29.

A compound is made of ________ atoms.

a)

big

b)

similar

c)

different

30.

A substance that contains only one type of atom is a(n)

a)

compound

b)

element

c)

heterogeneous mixture

d)

homogeneous mixture

31.
What type of mixture is this?
a)

homogeneous mixture

b)
chemical
c)
heterogeneous mixture 
d)
solid mix
32.
A mixture that is NOT evenly distributed is called ....
a)
Compounded
b)

Homogeneous

c)

Heterogeneous

d)
Salty
33.

Freshly brewed black coffee

a)

Heterogeneous

b)

Homogeneous

34.
Sugar water
a)
Heterogeneous
b)
Homogeneous
35.
Chicken soup is an example of what kind of substance?
a)

homogeneous mixture

b)
solution
c)
heterogeneous mixture
d)
compound
36.

Which of these pH values represent an acid?

a)

4

b)

8

c)

10

d)

12

37.

Milk is a very weak acid. What might its pH value be?

a)

6

b)

7

c)

4

d)

12

38.

The strongest bases have pH values close to

a)

0

b)

14

c)

7

d)

5

39.
What is the pH of water?
a)
0
b)
4
c)
7
d)
14
40.
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
41.
Soap is a weak base.  What is true about the taste of bases?
a)
they taste sour
b)
they taste sweet
c)
they taste bitter
d)
they taste salty
42.
Ammonia has a pH of 12.  Ammonia is __________.
a)
an acid
b)
a base
c)
an element
d)
a metal

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