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Chemistry 2nd Semester Review 2
Test Description: Chemistry semester review 2
Instructions: Answer all questions to get your test result.
1) As a hydrated compound is heated, it decreases in
A
mass
B
temperature
C
color
D
brightness
2) One mole of silicon has a mass of 28.086 g, and one mole of carbon has a mass of 12.011 g. What is the mass of one mole of silicon carbide (SiC)
A
40.097 g
B
2.340 g
C
3.3734 x 10 2 g
D
16.075 g
3) Methane (CH4) contains 75% Carbon. What percentage of methane is hydrogen?
A
25%
B
4%
C
33%
D
6%
4) Which compound has the smallest molar mass?
A
H2O2
B
H2O
C
CO
D
CO2
5) Sodium bromide dihydrate is correctly written as
A
NaBrH2
B
(NaBr)2.H2O
C
NaBr.2H2O
D
NaBr.(HO)2
6) Which conversion factor would you use to calculate correctly the mass of 2 moles of the element titatnium
A
47.87 g Ti/1 mol Ti
B
1 mol Ti/ 47.97 g Ti
C
1 g Ti/ 47.87 mol Ti
D
47.87 mol Ti/ 1 g Ti
7) A _______ is a ratio between the number of moles of any two substances in a balanced chemical reaction
A
mole ratio
B
theoretical yield
C
percent yield
D
stoichiometry
8) The amount of product actually produced by a chemical reaction is called the
A
theoretical yield
B
percent yield
C
limiting reactant
D
actual yield
9) The reactant that limits the extent of the reaction is called
A
limiting reactant
B
actual yield
C
theoretical yield
D
excess reactant
10) In the formation of a covalent bond, electrons are
A
lost
B
transferred
C
shared
D
gained
*select an answer for all questions
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