Balancing Chemical Equations
Types of Chemical Reactions
Redox Reactions
Acid-Base Reactions
Stoichometry
(Not Actually) Random (but Totally True)
100
Balance the following chemical equation:
NO2 → O2 + N2
2 NO2 → 2 O2 + 1 N2
100
Identify the type of chemical reaction:
C5H5 + Fe → Fe(C5H5)2
Synthesis
100
Determine the oxidation number of sulfur in:
SO42-
+4
100
Define a Brønsted–Lowry acid.
A proton (H⁺) donor.
100
Define a limiting reagent in a chemical reaction.
The reactant that runs out first and limits the amount of product formed.
100
Finishing this saying:
"G__ C_____!"
Go Cougs!
200
Balance the following chemical equation:
Al + O2 → Al2O3
4 Al + 3 O₂ → 2 Al₂O₃
200
Identify the type of chemical reaction:
CaCO3 → CaO + CO2
Decomposition
200
In the reaction:
Mg (s) + 2 HCl (aq) → MgCl2 (aq) + H2 (g)
Which species is oxidized?
Mg
200
Name the conjugate acid of HCO₃⁻.
H₂CO₃
200
If 3 moles of N₂ react with excess H₂ to form NH₃, how many moles of NH₃ are produced according to:
N2 + 3 H2 → 2 NH3
6 moles NH₃
200
What is the name of the town shown in the following picture and sometimes referred to as "simply the greatest town in the history of the world."
Pullman
300
Balance the following chemical equation:
C8H16 + O2 → CO2 + H2O
1 C8H16 + 12 O2 → 8 CO2 + 8 H2O
300
Identify the type of chemical reaction:
2 AgNO3 + 1 Cu → 1 Cu(NO3)2 + 2 Ag
Single Displacement
300
In the reaction below, identify the oxidation number of nitrogen in both compounds and determine if it is oxidized or reduced.
2 NO (g) + O2 (g) → 2 NO2 (g)
NO → N is +2
NO₂ → N is +4
Nitrogen is oxidized.
300
In the reaction:
NH3 + H2O ⇌ NH4+ + OH−
Identify:
The Brønsted–Lowry acid
The Brønsted–Lowry base
Acid: H₂O
Base: NH₃
300
In:
4 Fe + 3 O2 → 2 Fe2O3
How many moles of Fe₂O₃ are formed from 6 moles of O₂?
4 moles Fe₂O₃
300
This is the only school to go 0-12 in a season of football in PAC-12 history.
University of Washington Huskies
400
Balance the following chemical equation:
(NH4)2SO4 + Ca(OH)2 → CaSO4 + NH3 + H2O
(NH4)2SO4 + Ca(OH)2 → CaSO4 + 2 NH3 + 2 H2O
400
Identify the type of chemical reaction:
C2H5SH + O2 → CO2 + H2O + SO2
Combustion
400
Balance the following reaction using the half-reaction method:
BaCl2 (aq) + Na2SO4 (aq) → BaSO4 (s) + 2 NaCl (aq)
BaCl2 (aq) + Na2SO4 (aq) → BaSO4 (s) + 2 NaCl (aq)
It is already balanced
400
Rank the pH of these solutions from lowest to highest:
0.1 M HCl
Pure water
0.1 M NaOH
Lowest → HCl (acidic) → Water (neutral) → NaOH (basic) → Highest
400
In:
2 H2 + O2 → 2 H2O
If 3 moles of O₂ react completely, how many grams of H₂O are produced?
108 g H₂O
400
What is the name of the delicious tasting apple bred at Washington State University between the Honeycrisp and Enertprise apple.
The New York Times described the apple as "dramatically dark, richly flavored and explosively crisp and juicy", making it "the most promising and important apple of the future".
Cosmic Crisp
500
Balance the following chemical equation:
C5H9O + O2 → CO2 + H2O
4 C5H9O + 27 O2 → 20 CO2 + 18 H2O
500
Identify the type of chemical reaction:
HCl + CaCO3 → CaCl2 + H2O + CO2
Double Displacement (with gas formation)
500
Balance the following reaction using the half-reaction method:
Fe3+(aq) + Sn2+(aq) → Fe2+(aq) + Sn4+(aq)
Oxidation: Sn2+ → Sn4++ 2e−
Reduction: 2 (Fe3+ +e− → Fe2+)
2 Fe3+ + Sn2+ → 2 Fe2+ + Sn4+
500
HCl is a strong acid and CH₃COOH is a weak acid. Explain why a 0.01 M solution of each could have different pH values, even at the same concentration.
Strong acids fully dissociate (lower pH); weak acids partially dissociate (higher pH).
500
C3H8 + 5 O2 → 3 CO2 + 4 H2O
If 44 g of C₃H₈ react completely, how many molecules of CO₂ are formed?
1.80×10²⁴ molecules CO₂
500
Dolph Lundgren was a student at Washington State University as an exchange student and working toward a chemical engineering degree. He is best known for his role in what movie?
Rocky IV
