WorksheetsUnit 5 Exam
Total questions: 31
Worksheet time: 37mins
A balanced chemical equation is a representation of:
ideal gas law
law of conservation of mass
law of conservation of momentum
law of conservation of energy
Reactants _____ to form the _____
explode, reactants
react, products
produce, remnants
Which ones are the products:
Zn + HCl --> ZnCl2 + H2
Zn & HCl
ZnCl2 & H2
Zn
H2
Which is an example of a chemical change?
Temperature change
Mass change
Melting
Cooking a pancake is an example of a
physical change
chemical change
Law of conservation of mass states that
matter cannot be created or destroyed, only changed
6.02x1023 atoms = 1 mole
an object at rest will stay at rest until an external force acts upon it
matter can be created and destroyed
In a combustion reaction of methane (CH4) what are the products
CH4 and O2
O2 and H2O
CH4 and CO2
H2O and CO2
When an atom is oxidized, electrons are
shared
gained
lost
created
(T/F) Decomposition reactions produce two products
TRUE
FALSE
(T/F) Synthesis reactions produce one compound
TRUE
FALSE
(T/F) Combustion reactions always have water and carbon dioxide as reactants
TRUE
FALSE
In this balanced reaction what is the ratio of coefficients?
Cl2 + 2 RbI --> I2 + 2RbCl
1:1:1:2
1:2:1:2
2:2:3:2
2:2:1:2
Which kind of reaction is the following:
CH4 + O2 --> H2O + CO2
Synthesis
Decomposition
Single Replacement
Double Replacement
Combustion
Which kind of reaction is the following:
Li2(SO4) + BaCl2 --> LiCl + Ba(SO4)
Synthesis
Decomposition
Single Replacement
Double Replacement
Combustion
Which kind of reaction is the following:
H2 + O2 --> H2O
Synthesis
Decomposition
Single Replacement
Double Replacement
Combustion
Which kind of reaction is the following:
HCl --> H2 + Cl2
Synthesis
Decomposition
Single Replacement
Double Replacement
Combustion
What is the coefficient for Mg when the following equation is balanced?
__Mg + __Li3(PO3) --> __Li + __Mg3(PO3)2
1
0
3
6
When the reaction shown is balanced, the coefficients are
__C4H8 + __O2 --> __CO2 + __H2O
1 : 3.5 : 4 : 4
1 : 6 : 4 : 4
2 : 12 : 8 : 8
1 : 4 : 4 : 4
What the reaction shown is correctly balanced, the coefficients are
__N2 + __Al2O3 --> __Al + __NO3
2 : 2 : 4 : 2
1 : 2 : 2 : 2
1 : 2 : 4 : 1
1 : 2 : 4 : 2
What is the formula for lithium nitride?
Li3N
LiN
Li2N2
Li2(NO3)
What is the molar mass for Lithium nitride?
34.829 g/mol
48.962 g/mol
20.948 g/mol
31.101 g/mol
When aluminum bonds with oxygen, it forms the product:
Aluminum oxide: AlO
Aluminum oxide: Al2O3
Aluminum (II) oxide: Al2O3
Aluminum (III): Al3O2
The following reaction is an example of:
2 Li2O --> O2 + 4 Li
decomposition
single replacement
synthesis
combustion
What is the name of BaCl2
Barium (II) chlorate
Barium chloride
Barium (II) chloride
Barium perchlorate
What is the molar mass for magnesium?
12 g/mol
54.938 g/mol
6.02 x 1023 g/mol
24.305 g/mol
What is the missing product in the balanced equation below?
H2(SO4) + BaCl2 --> 2HCl + _________
Ba(SO4)
H2O
Ba2(SO4)
Ba(SO4)2
Which compound is covalent?
MgCl2
AlBr3
FeCl3
CO2
What is the percent composition by mass of aluminum in Al2O3
35.4%
47.1%
52.9%
18.9%
When 2 atoms SHARE a pair of electrons, which type of bond is formed?
ionic
metallic
covalent
static
A tetrahedral molecule will have how many bonds?
1
3
4
infinite
I feel prepared for this exam!!
Yes
No
