Types of Reactions
Random
Empirical and % Composition
Balancing
Moles
100
The formula mass of a compound is the
sum of the atomic masses of its atoms
100
The mole ratio of NO to O2 is
2:1
100
The empirical formula of a compound is CH2. The molecular formula of this compound could be ____
C2H4, C3H6, C4H8, C5H10, etc.
100
What should be conserved in all chemical reactions?
Mass, Charge, or Energy
100
What is the total number of moles of oxygen atoms in 1 mole of N2O4?
4 moles
200
What is the gram-formula mass of Mg(OH)2
58 grams
200
What is the gram-molecular mass of a compound if 5 moles of the compound has a mass of 100 grams?
20 grams
200
A substance has an empirical formula of CH2 and a molar mass of 56 grams per mole. The molecular formula for this compound is
C4H8
200
Which equation shows a conservation of mass?
A) 2 Na + Cl2 --> 2 NaCl
B) Al + 3 Br2 --> AlBr3
A) 2 Na + Cl2 --> 2 NaCl
200
What is the total number of moles of sulfur atoms in 1 mole of Fe2(SO4)3?
3 moles
300
List three types of chemical reactions
Synthesis, decomposition, single replacement, double replacement
300
Fe(s) + CuSO4(aq) --> FeSO4(aq) + Cu(s)
What total mass of iron is necessary to produce 2.00 moles of copper?
112 grams
300
What is the percent composition of nitrogen and oxygen in NO2?
30.4% nitrogen and 69.6% oxygen
300
The coefficients in a balanced chemical equation represent what?
The moles of the compounds in the reaction
300
The total number of moles represented by 20 grams of Li2CO3 is
0.27 moles
400
What is the mass of 0.75 moles of CO2?
33 grams
400
2 H2 + O2 --> 2 H2O
The total number of grams of O2 needed to produce 27 grams of water is
24 grams
400
Which compound has the smallest percent composition by mass of sulfur?
CaS, BaS, MgS, SrS
BaS
400
When this equation is correctly balanced using smallest whole numbers, what is the coefficient of Al(s)?
4
400
Which sample contains a total of 9.0 × 1023 atoms?
A) 0.50 mole of HCl
B) 0.75 mole of H2O
C) 1.5 moles of Cu
D) 1.5 moles of H2
C) 1.5 moles of Cu
500
2H2 + O2 --> 2H2O + energy
Which type of reaction is represented by this equation?
Synthesis
500
C3H8(g) +5O2(g) --> 3CO2(g) + 4H2O(g)
What is the total number of moles of O2(g) required for the complete combustion of 2.5 moles of C3H8(g)?
12.5 Moles
500
What is the percent composition by mass of carbon in (NH4)2CO3 (gram-formula mass = 96.0 g/mol)?
12.5%
500
2 Na + 2 X --> 2 NaOH + H2
What is the correct formula for the product represented by the letter X?
H2O
500
2C + 3H2 --> C2H6
What is the number of moles of C that must completely react to produce 3.0 moles of C2H6?
6 moles