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CA 7 Review

Total questions: 64

Worksheet time: 2hrs 36mins

Name
Class
Date
1.

How many atoms of sulfur are in each molecule of H2SO4?

a)

1

b)

4

c)

2

d)

7

2.

Alanine is an amino acid with formula C3H7NO2. How many atoms in all are in each molecule of alanine?

a)

3

b)

7

c)

12

d)

13

3.

How many atoms of carbon are in a molecule of vinyl chloride (C2H3Cl)?

a)

1

b)

3

c)

6

d)

2

4.

How many atoms of hydrogen are in a molecule of glucose (C6H12O6)?

a)

12

b)

6

c)

18

d)

4

5.

Which of the following statements accurately describes the number of atoms in a molecule of ammonia (NH3)?

a)

Three atoms of nitrogen and three atoms of hydrogen

b)

One atom of nitrogen and three atoms of hydrogen

c)

Three atoms of nitrogen and one atom of hydrogen

d)

One atom of nitrogen and one atom of hydrogen

6.
Na + MgF2 -->  NaF + Mg
What are the reactants?
a)
Na + MgF2
b)
Na
c)
NaF + Mg
d)
NaF
7.
In this image, the symbols to the right of the arrow (in black) are called the_______.
a)
Products
b)
Reactants
c)
Subscripts
d)
Coefficients
8.

What does the number 3 represent in 4NH3?

a)

Subscript

b)

Superscript

c)

Coefficient

9.

What does the number 4 represent in 4NH3?

a)

Subscript

b)

Superscript

c)

Coefficient

10.

How many Nitrogen (N) atoms are in 4NH3?

a)

4

b)

1

c)

3

d)

12

11.

How many Hydrogen (H) atoms are in 4NH3?

a)

4

b)

1

c)

3

d)

12

12.

How many total molecules is 4NH3?

a)

4

b)

1

c)

3

d)

12

13.
Is this equation balanced?
a)
yes
b)
no
c)
Not enough information
14.
Is this equation balanced?
a)
yes
b)
no
c)
Not enough information
15.
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
16.
Evidence of a chemical reaction include:
a)
Phase change
b)
No new substance
c)
Bubbles forming
d)
Shape change
17.
Is this chemical equation balanced?
2Na + Cl2 ----> 2NaCl
a)
Yes
b)
No
18.
Balance this equation:
MgCl2 --> Mg4+ Cl2
a)
It's already balanced.
b)
4MgCl2 --> Mg4+ 4Cl2
c)
4MgCl2 --> Mg4+ 5Cl2
19.

How many oxygen atoms are in the products for the chemical reaction below?
4Fe + 3O2 → 2Fe2O34Fe\ +\ 3O_{2\ }\rightarrow\ 2Fe_2O_3  

a)

2

b)

3

c)

5

d)

6

20.

According to the Law of Conservation of Mass, what happens to the wood and oxygen when it is burned?

a)

The wood disappears.

b)

It stays the same chemically.

c)

The atoms in the wood and oxygen rearrange and form smoke and ash.

d)

Nothing.

21.
A 55-gram egg is placed in a pot. After the egg is boiled, which is most likely the mass of the egg?
a)
50 
b)
55 
22.

Does the image correctly represent the Law of Conservation of Mass?

a)

yes

b)

no

23.

How many different elements are present in H2COCH2

a)

5

b)

4

c)

3

d)

2

24.

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

25.

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

26.

How many different elements are present in this molecule?

3 NH4C2H3O2

a)

15

b)

36

c)

5

d)

4

27.

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

a)

Coefficient

b)

Subscript

c)

Exponent

d)

Coordinator

28.

How many Hydrogen atoms are in 4H2O?

a)

6

b)

8

c)

2

d)

4

29.

How many Sodium atoms are in 6NaCl?

a)

1

b)

12

c)

6

30.

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

a)

0

b)

2

c)

only 1

d)

1 million

31.

Coefficients tell the number of __________ in a formula.

a)

Molecules

b)

Atoms

c)

Elements

d)

Oxygen

32.

CaCO3CaCO_3  

What is the TOTAL number of atoms that make up this compound?

(a)  

33.

How many atoms are in the products below?
4Fe +3O2 → 2Fe2O34Fe\ +3O_{2\ }\rightarrow\ 2Fe_2O_3  

a)

7

b)

10

c)

17

d)

20

34.
In a reaction A + B ----> C,  reactant A has 5g and product  C has 9g. How many grams does reactant B should have? 
a)
4g
b)
5g
c)
9g
d)
14g
35.
How many Mn atoms are found in the following compound?
3Cr(MnO4)6
a)
3
b)
4
c)
6
d)
18
36.
How many HCl molecules do you need to balance this equation? 
Mg +  __HCl --->  MgCl2 + H2
a)
1
b)
2
c)
3
d)
4
37.
Balance this equation:
 2Li + Cl2 -> LiCl
a)
2Li + Cl2 -> 4LiCl2
b)
2Li + Cl2 -> LiCl2
c)
2Li + Cl2 -> 2LiCl
38.

Which of the coefficients could be used to balance this equation?

__Ag2O →__ Ag +___O2

a)

2,4,1

b)

1,1,1

c)

2,1,2

d)

2,2,2

39.
Pb(NO3)2  +  KI --> PbI2 + KNO3
What type of reaction is this? 
a)
Synthesis 
b)
Decomposition 
c)
Single Replacement
d)
Double Replacement 
40.
What type of reaction is this?  
__H2O2 ---->  __H2O + O2
a)
Synthesis
b)
Decomposition 
c)
Single Replacement
d)
Combustion 
41.

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

42.
 Mg  +  ___ HCl  →   MgCl2  +   H2
a)
1
b)
2
c)
3
d)
4
43.

__ Al + __ FeO → Al2O2 + __ Fe

a)

1, 1, 2

b)

2,1,2

c)

2, 2, 2

d)

2,4,2

44.
Balance this equation.
_SnO2 +_H2-->_Sn +_H2O
a)
1,1,2,1
b)
1,2,1,1
c)
1,2,1,2
d)
1,2,2,1
45.
Balance this equation.
_CF4 + _Br2 -- _CBr4 + _F2
a)
2,1,2,1
b)
1,2,2,1
c)
1,2,1,2
d)
2,2,2,2
46.

Which equation represents a double displacement reaction?

a)

A + B --> AB

b)

AB --> A + B

c)

AB + C --> A + BC

d)

AB + CD --> AC + BD

47.

Which equation represents a single displacement reaction?

a)

A + B --> AB

b)

AB --> A + B

c)

AB + C --> A + BC

d)

AB + CD --> AC + BD

48.

Which equation represents a decomposition reaction?

a)

A + B --> AB

b)

AB --> A + B

c)

AB + C --> A + BC

d)

AB + CD --> AC + BD

49.

Which equation represents a synthesis reaction?

a)

A + B --> AB

b)

AB --> A + B

c)

AB + C --> A + BC

d)

AB + CD --> AC + BD

50.

For a process to be defined as a chemical reaction, _____ must be produced.

a)

more mass

b)

the same substance

c)

light

d)

a new substance

51.

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

a)

The break down of food into energy

b)

Photosynthesis in plants

c)

Metal rusting

d)

All of the above

e)

None of the Above

52.

One example of a chemical reaction is when H20 (water) melts and changes state from ice to liquid.

a)

True

b)

False

53.

A chemical equation is used to describe how two or more substances_________

a)

Will be draw

b)

Vaporize

c)

Interact during a chemical reaction

d)

Produce

54.

In a chemical reaction

a)

Products are on the left and reactants on the right of the reaction arrow

b)

Products and reactants are on both the left and the right of the reaction arrow

c)

reactants are on the left and products on the right of the reaction arrow

55.

In a chemical reaction, the number of atoms in the reactants and the products...

a)

Must be the same

b)

Must be different

56.

Which of these is NOT a sign of a chemical reaction?

a)

A phase change

b)

Formation of a precipitate

c)

A color change

d)

A temperature change

57.

Is the chemical equation here balanced?

a)

Yes

b)

No

58.
Evidence of a chemical reactions is anything that shows - 
a)
a new substance has formed
b)
a solid dissolved in a liquid
c)
interaction between 2 gases
d)
a change in the state of matter
59.
One of the signs of a chemical reaction taking place is:
a)
Bubbles are produced 
b)
Reactants are not combining
c)
Products are not forming
d)
Color is not changing
60.
Which of the following describes a precipitate?
a)
a liquid forms when a block of metal is heated
b)
a solid forms when one liquid is poured into another
c)
a gas forms when a solid is placed in a liquid
d)
bubbles form when an acid is poured on a rock
61.
Which is NOT an indication of a chemical change?
a)
temperature change
b)
formation of a precipitate
c)
shape change
d)
production of light
62.
A clear liquid from a flask is poured into another clear liquid in a beaker. Which of the following results of this procedure would indicate a new substance was formed?
a)
The level of the substance in the beaker is higher after the other liquid is added.
b)
A yellow solid forms and then settles to the bottom of the beaker.
c)
Small white crystals are left behind in the flask that held the first liquid.
d)
The mass of the combined liquids is greater than either original liquid.
63.
Which of the following is an example that includes evidence of a chemical reaction?
a)
A sample of zinc is placed in water and it settles to the bottom
b)
A solid block of ice is heated and it completely melts into a liquid. 
c)
Sugar that is burned gives off an odor and turns brown and then black.
d)
A tomato is placed into a blender and chopped up into smaller pieces.
64.
Four students performed four different investigations by combining different substances. Which of the observations is most indicative of a chemical reaction?
a)
investigation 1
b)
investigation 2
c)
investigation 3
d)
investigation 4

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