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Unit 4: Chemical Reactions And Stoichiometry
Test Description: Chemical reactions and stoichiometry
Instructions: Answer all questions to get your test result.
1) What type of reaction is AX = Z+ X?
A
synthesis
B
decomposition
C
double replacement
D
single replacement
2) What type of reaction is AB+X = AX+B
A
double replacement
B
synthesis
C
decomposition
D
single replacement
3) What's a correct balanced equation?
A
MgO = Mg + O2
B
2H2 + O2 = 2H2O
C
2H2O2 = H2 + O2
D
K + Cl = KCl2
4) How many grams are there in 2.5 mol of H2O?
A
1.38 g
B
.1388 g
C
75 g
D
45 g
5) What's the mol of 4.6g of MgCl2?
A
.048 mol
B
433.78 mol
C
4 mol
D
94.3 mol
6) What's the molar mass of H2SO4?
A
64 g/mol
B
32 g/mol
C
66 g/mol
D
98 g/mol
7) what type of reaction is AC + BD = BC + AD?
A
double replacement
B
decomposition
C
synthesis
D
single replacement
8) What's the % composition of H in H2O?
A
13%
B
16%
C
11%
D
20%
9) What's the % composition of oxygen in H3PO4?
A
32%
B
3%
C
6.5%
D
65%
10) What's the % composition of S in H2SO4?
A
33%
B
65%
C
36%
D
40%
*select an answer for all questions
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