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Moles & Stoich Test Review #1
Test Description: WRHS-2nd Semester Chem
Instructions: Answer all questions to get your test result.
1) In nature the "-gens" exist as _____.
A
polyatomic ions
B
single atoms
C
solutions
D
diatomic molecules
2) What is the calculation of chemical quantities from chemical equations called?
A
stoichiometry
B
dimensional analysis
C
chemistry
D
spectroscopy
3) What is the molar mass of carbon dioxide (CO2)
A
44 g/mol
B
28 g/mol
C
56 g/mol
D
12 g/mol
4) What is the mass, in grams, of 7.29 x 10^24 atoms of potassium?
A
182 g
B
375 g
C
473 g
D
230 g
5) What is the percent composition of oxygen in aluminum hydroxide?
A
78%
B
21%
C
35%
D
62%
6) What is the limiting reagent when 24 g iron and 37g chlorine gas react (see equation 1)
A
Cl2
B
Cl
C
Fe
D
not enough information
7) What are the coefficients when equation 2 is balanced?
A
1,1,1
B
4,2,4
C
3,2,3
D
2,1,2
8) What is the ratio of C2H2 : O2 in equation 4?
A
2:5
B
1:5
C
1:1
D
4:10
9) What is the theoretical yield of silver if 3.4g Cu react with an excess of silver nitrate? What is the percent yield if the actual yield is 5.0g? (see equation 5)
A
733g, 0.68%
B
0.11g, 4545%
C
6.8g, 74%
D
11.5g, 43%
10) How many atoms of sulfur are in Al2(SO4)3?
A
3
B
1
C
2
D
4
*select an answer for all questions
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