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2nd semester exam Chemistry 23-24

Total questions: 75

Worksheet time: 2hrs 48mins

Name
Class
Date
1.
What is the NAME of....
Na2S
a)
sodium (II) sulfide
b)
sodium sulfide
c)
disodium sulfide
d)
sodium sulfur
2.
What is the NAME of....
Mg3N2
a)
magnesium (III) nitride
b)
magnesium (II) nitride
c)
magnesium (II) nitrogen
d)
magnesium nitride
3.
What is the FORMULA for....
beryllium iodide
a)
Be2I
b)
BeI
c)
BeI2
d)
BI2
4.
The name of Al₂(SO₄)₃ is
a)
aluminum sulfur oxide
b)
aluminum sulfate
c)
aluminum trisulfate
d)
aluminum (III) sulfate
5.
The name of Fe(OH)₂ is
a)
iron oxide
b)
iron hydroxide
c)
iron (II) hydroxide
d)
iron dihydroxide
6.
The chemical formula of sodium sulfate is
a)
S₂SO₄
b)
NaSO₂
c)
NaSO₄
d)
Na₂SO₄
7.
Fe+3 combines with S-2 to form 
a)
Fe+4(S)=3
b)
Fe2S4
c)
Fe2S3
d)
Fe3S2
8.
What formula results when Fe+3 and CO3-2 ions bond?
a)
FeCO3
b)
Fe2CO3
c)
Fe2(CO3)3
d)
Fe3(CO3)2
9.
Ionic Compounds are made up of ions from ________ and _______.
a)
metals, metals
b)
nonmetals, nonmetals
c)
metals, nonmetals
d)
oxygen, carbon
10.

Match the element to the number of atoms it has.

2 Al(C2H3O4)2

a)

aluminum

1.

2

b)

carbon

2.

8

c)

hydrogen

3.

12

d)

oxygen

4.

16

11.

Which chemical formula correctly displays 1 atom of nickel and 2 atoms of Fluorine?

a)

niF2

b)

NIF2

c)

Ni1F2

d)

NiF2

12.
How many O's are in Al₂(SO₄)₃
a)
4
b)
12
c)
7
d)
24
13.
How many Hydrogen are in 4H2O?
a)
6
b)
8
c)
2
d)
4
14.
Name this alkane
a)
Methane
b)
Ethane
c)
Propane
d)
Butane
15.

Indicate the C atoms in the structure below

A
B
C
D
E
F
G
H
16.

Name the following hydrocarbon

a)

2-heptene

b)

2-heptane

c)

2-hexane

d)

2-hexene

17.

The maximum number of covalent bonds in a carbon atom is....

a)

6

b)

2

c)

3

d)

4

e)

5

18.

In the diagrams provided, the circles of different colors represent the atoms of different elements. Which diagram represents a mixture?

a)

I

b)

II

c)

III

d)

IV

19.

Which beaker contains only one type of element?

a)

A

b)

B

c)

C

d)

D

20.
Classify the sample
a)
Element
b)
Compound
21.
Which chemical formula could be represented by this sample?
a)
NaCl
b)
H2
c)
C6H12O6
d)
Cu
22.

Which of the following formulas represents a compound?

a)

4 He

b)

5 O2 + 3 LiBr

c)

2 MgO

d)

Ag

23.

A(n) ____________________________ mixture has the same composition throughout

a)

homogeneous

b)

heterogeneous

c)

molecular

d)

total

24.

Which of the following options provides evidence of a CHEMICAL change?

a)

Wood is burned releasing ash and smoke

b)

Rocks separate when soil is sifted

c)

Water turns to ice when you put it in the freezer

d)

Salt dissolves in water

25.

Is this an example of a physical or chemical change?

a)

Physical

b)

Chemical

26.

Is this an example of a physical or chemical change?

a)

Physical

b)

Chemical

27.

Is this an example of a physical or chemical change?

a)

Physical

b)

Chemical

28.

Is this an example of a physical or chemical change?

a)

Physical

b)

Chemical

29.

A change in which NEW substances are formed.

a)

Chemical change

b)

Physical change

30.

How many atoms are in 1 mole of any material?

a)

63.584

b)

12

c)

6.022 x1023

d)

6 x1012

31.

How many grams are in 1 mole of Copper?

a)

6.022 x1023

b)

63.546

c)

12.011

d)

6 x1012

32.

How many atoms are in 4.5 moles of copper?

a)

4.5 atoms

b)

6.022 x1023 atoms

c)

2.7 x1024 atoms

d)

1.34 x1023

33.

How many grams is 0.0825 moles of Silver?

a)

0.0825 grams

b)

4.97 x1022 grams

c)

6.022 grams

d)

8.90 grams

34.

Reorder the following from most mass to least mass

a)

1.00 moles of Na

b)

1.00 mole of carbon

c)

1.00 x 1023 atoms of carbon

d)

1.00 grams of carbon

e)

1.00 atoms of carbon

1)
2)
3)
4)
5)
35.
Which of the following dimensional analysis setups will correctly convert 4.00x1023atoms of cobalt to moles of cobalt? How many moles of colbalt are there?
a)
setup B : 0.6644mol Co
b)
setup A: 2.41x1047mol Co
c)
setup A : 0.664mol Co
d)
setup B: 2.41x1047mol Co
36.
Which of the following dimensional analysis setups will correctly convert 27.76g of Li to atoms of Li?
a)
A
b)
B
c)
C
d)
D
37.

The Empirical Formula for a substance is CF2. The Molecular formula mass is 200. g/mol. What is the Molecular formula?

a)
C4F8
b)
C4F
c)
CF8
d)
C2F4
38.
What is the empirical formula for C3H8
a)
CH
b)
C3H8
c)
C6H16
d)
CH2.7
39.

A formula with the lowest whole # molar ratio of elements in a compound is called

a)
Molecular Formula
b)
Chemical Formula
c)
Empirical Formula 
40.
Is this equation balanced?
a)
yes
b)
no
c)
Not enough information
d)
Left side is balanced
41.
How many atoms of aluminum are on each side of the following equation: 4Al + 3O2 --> 2Al2 O3
a)
2
b)
6
c)
1
d)
4
42.
Balance this equation
_Zn+_HCl-->_ZnCl2 +_H2
a)
1,1,2,1
b)
1,1,1,2
c)
1,2,1,1
d)
2,1,1,1
43.

N2 + H2 --> NH4

a)

Balanced

b)

Unbalanced

44.

Balance the following reaction:

​ (a)   NaI + ​ (b)   Pb(SO4)2 → ​ (c)   PbI4 + ​ (d)   Na2SO4

Choose from the below words
4
1
2
3
45.

Label the important information in a chemical equation

a)

Subscript

b)

Coefficient

c)

Yields

d)

Liquid (state of matter)

1
2
3
4
1)
2)
3)
4)
46.
Two Reactants and One Product
a)
Decomposition
b)
Combination
c)
Combustion
d)
Single Replacement
47.
CxHy +O2 --> H2O + CO2
a)
Decomposition
b)
Double replacement
c)
Combustion
d)
Single Replacement
48.
One reactant into several products.
a)
Decomposition
b)
Synthesis
c)
Combustion
d)
Single Replacement
49.
What is the type of reaction shown at the top?
a)

Synthesis (Combination)

b)
Decomposition
c)
Single Replacement
d)
Double Replacement
50.
This pictures simulates what type of reaction?
a)
Synthesis
b)
Decomposition
c)
Single Replacement
d)
Double Replacement
51.
What type a reaction is taking place in this picture?
a)
Synthesis
b)
Decomposition
c)
Single Replacement
d)
Double Replacement
52.
What does (aq) mean in a chemical reaction?
a)
Ag
b)
silver
c)
aqualirious
d)
aqueous
53.
Si + S8 --> Si2S4
a)
Synthesis (combination)
b)
Decomposition
c)
Single replacement
d)
Double replacement
54.
The following reaction is an example of what reaction type? 
CoCO3 → CoO + CO2
a)
Synthesis
b)
Decomposition
c)
Single Replacement
d)
Double Replacement
55.

Based on the information provided, which type of reaction is this?


RS ➔ R + __________

a)

Double replacement

b)

Single replacement

c)

Synthesis

d)

Decomposition

56.

What is the missing product?


RS ➔ R + __________

a)

RS

b)

S

c)

T

57.

Based on the information provided, what type of reaction is this?


RS + TU ➔ RU + _________

a)

Double replacement

b)

Single replacement

c)

Synthesis

d)

Combustion

58.

What is the missing product?


RS + TU ➔ RU + _________

a)

S

b)

T

c)

TS

59.

Based on the information provided, what type of reaction is this?


R + ST ➔ RT + _________

a)

Double replacement

b)

Single replacement

c)

Synthesis

d)

Decomposition

60.

What is the missing product?


R + ST ➔ RT + _________

a)

R

b)

T

c)

S

61.

Based on the information provided, which type of reaction is this?


R + S ➔ _________

a)

Double replacement

b)

Single replacement

c)

Synthesis

d)

Decomposition

62.

What is the missing product?


R + S ➔ _________

a)

R

b)

S

c)

RS

63.

What can be determined from a balanced chemical equation?

a)

mole ratio of any two substances in the reaction

b)

total energy released from the reaction

c)

electron configuration of all elements in the reaction

d)

sequence of events that lead to formation of products

64.

Where are the numbers for a mole ratio found?

a)

They are part of the chemical formula.

b)

They are given in the problem.

c)

They are found using the periodic table.

d)

They are found as coefficients in the balanced chemical equation.

65.

A balanced chemical equation tells us the relative amounts (unit mol) or the ratios of reactants and products.


In the balanced equation 2HgO → 2Hg + O2, what is the mole ratio of HgO to O2?

a)

2 : 2

b)

1 : 1

c)

2 : 1

d)

1 : 2

66.

In the balanced equation 2Al2O3 → 4Al + 3O2, what is the mole ratio of aluminum to oxygen?

a)

3 : 2

b)

3 : 4

c)

4 : 3

d)

2 : 3

67.

H2 + Cl2 → 2HCl

What is the total number of moles of HCl produced after 3 moles of H2 is completely used up?

a)

2 mol

b)

3 mol

c)

5 mol

d)

6 mol

68.

Use the equation 2 Al + 3 Cl2 ---> 2 AlCl3. If 2 moles of aluminum and 2 moles of chlorine are reacted, identify the limiting reactant.

a)

AlCl3

b)

Cl2

c)

Al

69.
The limiting reactant
a)
slows the reaction down
b)
is used up first
c)
is the reactant that is left over
d)
controls the speed of the reaction
70.
The excess reactant
a)
.
b)
is used up first
c)
is the reactant that is left over
d)
.
71.

Why is it important to identify the limiting reagent?

a)

The limiting reagent speeds up the reaction.

b)

The limiting reagent controls the amount of product formed.

c)

If there is no limiting reagent, the reaction will not occur.

d)

No stoichiometry calculations can be done without a limiting reagent.

72.

Excess reactant is usually the one that first to run out.

a)

True

b)

False

73.

Given the formula for the percentage yield as Actual yield/Theoretical yield x 100%, What is the percentage yield if the actual yield is 5 moles of NaCl and the theoretical yield is 6 moles NaCl?

a)

120 %

b)

83.33 %

c)

82.33%

d)

33.33%

74.

Using the diagram, determine the limiting reactant, the product formed is water.

a)

oxygen

b)

hydrogen

c)

none of the reactant are limiting

d)

both hydrogen and oxygen

75.

A chemistry student calculated the concentration of a solution to be 0.5 M, but the actual concentration was found to be 0.45 M. What is the percent error of the student's calculation?

a)

10%

b)

11.11%

c)

11.67%

d)

12.22%

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