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Chapter 7 Chemical Reactions

Total questions: 78

Worksheet time: 2hrs 37mins

Name
Class
Date
1.
What type of chemical reaction is this one?
CUO + CO2 --> CuCO3
a)
Decomposition
b)
Combustion
c)
Synthesis
d)
Single Replacement 
2.
What type of chemical reaction is this one?
Al(OH)3 --> Al2O3  + H2O
a)
Decomposition
b)
Combustion
c)
Synthesis
d)
Single Replacement 
3.
What type of chemical reaction is this one?
Ca + MgCl2 --> CaCl2 + Mg
a)
Decomposition
b)
Combustion
c)
Synthesis
d)
Single Replacement 
4.
What is a reactant?
a)
The chemical substances that begin the reaction.
b)
What comes from the reaction.
5.
What is a yield?
a)
The arrow in an equation that represents the chemical reaction.
b)
The beginning substances.
6.
What is a coefficient?
a)
The small number on the right of the chemical symbol.
b)
The large number to the left of a formula.
7.
What is a product?
a)
What's left of the chemical reaction.
b)
The beginning formulas.
8.
Decomposition occurs when...
a)
Two formulas combine.
b)
A formula breaks apart.
c)
An atom is replaced during a reaction.
11.
A synthesis occurs when...
a)
Two formulas combine.
b)
A formula breaks apart.
c)
An atom is replaced during a reaction.
10.
What coefficients are needed to correctly balance the equation?
_Bi   +   _O2   >   _Bi2O3
a)
3,2,3
b)
2,3,2
c)
4,3,2
d)
none of these
11.
A synthesis occurs when...
a)
Two formulas combine.
b)
A formula breaks apart.
c)
An atom is replaced during a reaction.
12.
What coefficients are needed to correctly balance the equation?
_Bi   +   _O2   >   _Bi2O3
a)
3,2,3
b)
2,3,2
c)
4,3,2
d)
none of these
13.
True/False: The reactants in an exothermic reaction have more energy than the products.
a)
True
b)
False
14.
Why must chemical equations be balanced?
a)
So that the equation doesn't explode
b)
The reaction won't happen until it is balanced
c)
Matter cannot be created or destroyed
d)
None of these
15.
What must go in the blank space to balance the equation?
4Fe  +  _O2  -->  2Fe2O3
a)
1
b)
2
c)
3
d)
4
16.
A reaction that gives off heat to its surroundings is...
a)
exothermic
b)
endothermic
c)
endergonic
d)
none of these
17.
Which type of reaction will feel cold?
a)
exothermic
b)
exergonic
c)
endothermic
d)
none of these
18.
In chemical reactions, the law of conservation of mass is......
a)
disobeyed
b)
not true
c)
obeyed
d)
used sometime
19.
Balance this equation, Ca + H2O --> CaO + H2
a)
Ca + 2H2O --> CaO + 2H2
b)
2Ca + H2O --> CaO + H2
c)
Its balanced as it is
d)
Cannot be balanced
20.
In the equation,          2Mg + O2 ---> 2MgO, which are the reactants?
a)
Mg and O
b)
MgO
c)
Mg and MgO
d)
O and MgO
21.
Which statement is not a description of a chemical reaction?
a)
A solid is dropped into a beaker of liquid and a gas is released.
b)
Two liquids are mixed in a beaker and a solid forms at the bottom of the beaker.
c)
A solid is dropped into a beaker of liquid and an explosion occurs.
d)
A liquid is heated on a hot plate and its temperature rises.
22.
In a chemical reaction
a)
The atoms of the reactants always stay together to form the products
b)
The atoms of the reactants unbond, rearrange, and then rebond to form the products
c)
New atoms are formed which combine to make the products
d)
Some atoms disappear while others multiply to form the products
23.
True or False
In a chemical reaction, no new atoms are created, and no atoms are destroyed. 
a)
true
b)
false
24.
Which of the following options correctly balances the equation below?
__HNO2 + __O2 --> __HNO3
a)
4, 1, 4
b)
1, 2, 1
c)
1, 2, 1
d)
2, 1, 2
25.
The left side of the equation below is called
a)
Products
b)
Reactants
26.
The right side of the equation below is called the
a)
products
b)
reactants
27.
What type of reaction is illustrated below?
Zn + H2S --> ZnS + H2
a)
synthesis
b)
decomposition
c)
single replacement
d)
double replacement
28.
A precipitate is...
a)
a solid that falls out of a liquid solution
b)
a reactant in a reaction
c)
a clear substance
d)
the mass of a product
29.
Mass cannot be ____ or _____.
a)
made, changed
b)
created, destroyed
c)
rearranged, unmade
d)
stagnant, unchanging
30.
Aqueous means...
a)
dissolved in water/solution
b)
water
c)
liquid
d)
plasma
31.
Translate the following word equation: 
Liquid nitrogen and oxygen gas combine to form nitrogen monoxide gas. 
a)
N + O → NO
b)
N2 + O2 → N2O2
c)
N2(l) + O2(g) → NO(g)
d)
N(l) + O2(g) → NO(g)
32.
Which of the following is not evidence of a chemical reaction?
a)
Formation of a precipitate
b)
Production of gas
c)
Change in temperature
d)
Change in state of matter
33.
What type of reaction is shown in image?
a)
exothermic reaction
b)
endothermic reaction
c)
synthesis reaction
d)
decomposition reaction
34.
What type of reaction is shown in image?
a)
exothermic reaction
b)
endothermic reaction
c)
single displacement reaction
d)
double displacement reaction
35.
In an exothermic reaction energy is ...
a)
released
b)
absorbed
c)
protons
d)
electrons
36.
In an endothermic reaction energy is...
a)
released
b)
absorbed
c)
protons
d)
neutrons
37.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
38.
A physical change is?
a)
It changes the object into something different
b)
Objects or substances undergo a change that does not change their chemical composition
c)
it is just like a chemical reaction
d)
Paper burning
39.
A chemical change is?
a)
a shoe lace cut in half
b)
doesn't change anything
c)
changes the look of an object
d)
change that results in the formation of new chemical substances
40.
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
41.
Which of the following is a compound?
a)
Co
b)
O2
c)
C
d)
CO2
42.
Evidence of a chemical reaction include:
a)
Phase change
b)
No new substance
c)
Bubbles forming
d)
Shape change
43.
What are the reactants in the chemical equation pictured?
a)
CH4 and CO2
b)
CH4 and O2
c)
CO2 and H2O
d)
O2 and H2O
44.
What is a shorthand notation that represents a compound or molecule called?
a)
Chemical Equation
b)
Chemical Formula
c)
Chemical Reaction
d)
Chemical
45.
What is the molar mass of MgCl2?
a)
95.21 g/mol
b)
94.61 g/mol
c)
89.88 g/mol
d)
94.26 g/mol
46.
What is molar mass of NaOH?
a)
40.98 g/mol
b)
39.2 g/mol
c)
41.65 g/mol
d)
40.00 g/mol
47.

one mole is equal to

a)

6.02 x 1022 of anything

b)

6.02 x 1023 of anything

c)

6.02 x 1024 of anything

d)

6.02 x 1025 of anything

48.

The molar mass of carbon is

a)

12.01 g/mol

b)

20.01 g/mol

c)

30.01 g/mol

d)

40.01 g/mol

49.

You can find the molar mass of a compound by

a)

Multiplying the atomic mass of each atom with its subscript and sum all its products.

b)

Just find one atom's atomic mass

c)

Divide the atomic mass of each atom with its subscript and sum all its products

d)

do nothing

50.

Find the molar mass of NaCl

a)

22.99 g/mol

b)

35.45 g/mol

c)

58.44 g/mol

d)

62.00 g/mol

51.

Find the molar mass of CH4

a)

12.00 g/mol

b)

10.00 g/mol

c)

16.04 g/mol

d)

25.00 g/mol

52.

Find the molar mass of C2H3Cl PVC

a)

60.00 g/mol

b)

62.49 g/mol

c)

64.00 g/mol

d)

68.00 g/mol

53.

Find the molar mass of Na2SO4

a)

142.05 g/mol

b)

100.07 g/mol

c)

110.62 g/mol

d)

135.06 g/mol

54.

For question 10 you found the molar mass of Na2S04. Now find the number of moles in a 300 g sample of this substance

a)

1.000 mol

b)

3.000 mol

c)

2.112 mol

d)

5.000 mol

55.

25 g of iron = _________atoms of iron Fe

a)

0.70 x 1023 atoms

b)

1.70 x 1023 atoms

c)

2.70 x 1023 atoms

d)

5.70 x 1023 atoms

56.

How many moles does 17.3 grams of silver (Ag) represent?

a)

0.100 mole

b)

0.020 mole

c)

0.160 mole

d)

0.320 mole

57.
What types of reactions absorb and release heat?
a)
acidic and basic
b)
endothermic and exothermic
c)
endothermic and heat transfusion
d)
covalent and ionic
58.
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
59.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
60.
How many atoms of carbon (C) are in  C6H12O6?
a)
3
b)
6
c)
12
d)
24
61.
How many atoms are there TOTAL in:
H2SO4
a)
6
b)
5
c)
7
d)
3
62.

 C2H6 + 5O2 → 2CO2 + 3H2O2C_2H_6\ +\ 5O_2\ \rightarrow\ 2CO_2\ +\ 3H_2O_2  
Given this chemical equation, what are the REACTANTS?

a)

 C2H6 and 5O2C_2H_{6\ }and\ 5O_2  

b)

 2CO2 and 3H2O22CO_2\ and\ 3H_2O_2  

63.

 C2H6 + 5O2 → 2CO2 + 3H2O2C_2H_6\ +\ 5O_2\ \rightarrow\ 2CO_2\ +\ 3H_2O_2  
Given this chemical equation, what are the PRODUCTS?

a)

 C2H6 and 5O2C_2H_{6\ }and\ 5O_2  

b)

 2CO2 and 3H2O22CO_2\ and\ 3H_2O_2  

64.

Observe the reaction shown here. The formula for this equation is  N2 + H2 → NH3N_2\ +\ H_2\ \rightarrow\ NH_3  . Does this represent a balanced equation that obeys the Law of Conservation of Mass?

a)

No. The reactants and products are not equal in numbers of atoms of each element. 

b)

Yes. The reactants and products are equal in numbers of atoms of each element. 

65.

Identify the number in blue.

a)

Product

b)

Reactant

c)

Coefficient

d)

Subscript

66.

How many atoms of nitrogen are in the compound shown above?

a)

1

b)

2

c)

3

d)

4

67.

How many atoms of nitrogen are present in this molecule?

a)

1

b)

2

c)

3

d)

4

68.
Balance this chemical reaction......?  
__H2O2 ---->  __H2O + O2
a)
2H2O2  //  2H2O
b)
1H2O2  //  2H2O
c)
2H2O2  //  1H2O
d)
H2O2  //  2H2O
69.
Why is it called the Law of Conservation of Matter/Mass? 
a)
Energy is created and destroyed 
b)
Energy is never created, nor destroyed-- it always moves 
c)
Energy moves between particles
d)
Energy stops moving at the end of the universe 
70.
CaCO3 represents a chemical
a)
Symbol
b)
Formula
c)
Subscript
d)
Reaction
71.

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

72.

How many Mn atoms are found in the following compound?

3 Cr(MnO4)6

a)

3

b)

4

c)

6

d)

18

73.
Balance this equation
_N2 + _H2 --> _NH3
a)
1,2,3
b)
1,3,2
c)
1,1,2
d)
2,1,1
74.
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
75.
Balance this equation:
P4+O2  -->  P2O3
a)
3 P4+ O2 --> 2 P2O3
b)
 P4+ O2 --> 2 P2O3
c)
 P4+ 3 O2 --> 2 P2O3
d)
 P4+ 2 O2 --> 3 P2O3
76.

How many grams are in 7.8 moles of NaCl?

a)

476 grams

b)

460 grams

c)

452 grams

d)

462 grams

77.
How many moles are in 22 g of argon? 
a)
880 moles
b)
0.55 moles
c)
1.81 moles
d)
5 moles
78.
How many moles are in 2.3 grams of phosphorus?
a)
0.07 moles
b)
71.3 moles
c)
13.5 moles
d)
20 moles

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