# Unit 4: Chemical Reactions And Stoichiometry: Question Preview (ID: 19213)

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What type of reaction is AX = Z+ X?
a) synthesis
b) decomposition
c) single replacement
d) double replacement

What type of reaction is AB+X = AX+B
a) synthesis
b) decomposition
c) single replacement
d) double replacement

What's a correct balanced equation?
a) K + Cl = KCl2
b) 2H2O2 = H2 + O2
c) MgO = Mg + O2
d) 2H2 + O2 = 2H2O

How many grams are there in 2.5 mol of H2O?
a) 45 g
b) .1388 g
c) 75 g
d) 1.38 g

What's the mol of 4.6g of MgCl2?
a) 4 mol
b) 433.78 mol
c) 94.3 mol
d) .048 mol

What's the molar mass of H2SO4?
a) 64 g/mol
b) 32 g/mol
c) 66 g/mol
d) 98 g/mol

what type of reaction is AC + BD = BC + AD?
a) synthesis
b) decomposition
c) single replacement
d) double replacement

What's the % composition of H in H2O?
a) 16%
b) 13%
c) 11%
d) 20%

What's the % composition of oxygen in H3PO4?
a) 65%
b) 3%
c) 32%
d) 6.5%

What's the % composition of S in H2SO4?
a) 33%
b) 36%
c) 40%
d) 65%

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