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