Redox
What kind of reaction is not considered a redox reaction?
What mass of aluminium oxide will be formed from its elements when the enthalpy change is 3.00x103 kJ?
183g
If the pH of a solution of NaCN(aq) is 8.710, then what is the equilibrium concentration of CN- (aq), expressed in scientific notation?
1.63 x 10-6
What kind of shift would occur if the following reaction was heated?
2 Ag+(aq) + Cu(s) ⇌ 2 Ag(s) + Cu2+(aq) + 54.1 kJ
Shift toward reactants
Rank these chemicals from lowest to highest boiling points
1 Butanoic acid C3H7COOH(l)
2 Methanoic acid HCOOH(l)
3 Octanoic acid C7H15COOH(l)
4 Octadecanoic acid CH3(CH2)16COOH(l)
2134
In the following reaction what is the oxidizing agent
6Na(s) + Cr2O72−(aq) + 14H+(aq) → 2Cr3+(aq) + 6Na+(aq) + 7H2O(l)
Cr2O72− (aq)
What is the molar enthalpy of formation of cyclopropane?
3 C(s) + 3 H2(g) > C3H6(g)
30.9
Pyridine, C5H5N(l), is a colourless liquid. It is used as a solvent and as a chemical reactant in organic synthesis. The base ionization constant for pyridine is 1.8 x 10–9.
What will the pH of a 0.10 mol/L aqueous solution of pyridine be?
9.13
If hydrogen gas is added to reaction I at equilibrium, then the concentration of the carbon dioxide will ____ and the value of the KC will ____
I CO2(g) + H2(g) > CO(g) + H2O(g) Keq = 0.137
II CO(g) + H2O(g) > CO2(g) + H2(g) Keq = unknown
A decrease | stay the same
B increase | stay the same
C increase | decrease
D decrease | increase
A
What is ethanoic acid commonly known as?
Vinegar
What are the coefficients for the following balanced equation?
HNO3 + H2S → NO + S + H2O
2 HNO3 + 3 H2S → 2 NO + 3 S + 4 H2O
A student supplied the following four metals with the same amount of energy. The initial temperature of each metal was 20.0 °C and the mass of each metal piece was 1.00 g.
1) Iron
2) Tin
3) Copper
4) Aluminium
Rank the metals from greatest to least in terms of final temperature reached
2314
Potassium sorbate, C5H7COOK(aq), is used as a preservative in beverages to inhibit the growth of mould. The equilibrium formed when the sorbate ion, C5H7COO– (aq), reacts with water can be represented by the following equation.
C5H7COO– (aq) + H2O(l) ⇌ C5H7COOH(aq) + OH– (aq)
Kb = 5.8 × 10–10
Although the potassium sorbate is added to the beverage, it is the sorbic acid, C5H7COOH(aq), that inhibits the growth of mould.
What is the value of Ka for sorbic acid, expressed in scientific notation (a.b × 10–c)
1.7 x 10-5
Methane gas, CH4(g), can be produced in a laboratory by reacting carbon disulfide, CS2(g), and hydrogen gas, H2(g), as represented by the following equation.
CS2(g) + 4 H2(g) ⇌ CH4(g) + 2 H2S(g)
Initially, at a temperature of 90 °C, 0.18 mol/L CS2(g) and 0.31 mol/L H2(g) are present in a closed container. When equilibrium is established, 0.13 mol/L CS2(g) is present.
What it the concentration of hydrogen gas present in the container at equilibrium?
0.11 mol/L
. The formula that represents an alkene is __________ and the formula that represents an alkyne is __________
A. C6H12 | C6H10
B. C6H12 | C6H14
C. C6H10 | C6H12
D. C6H10 | C6H14
A
What is the oxidation number of sulfur in sulfuric acid?
+6
In a calorimetry experiment, 4.00 g of potassium iodide was added to 150 mL of water. If the temperature decreased by 8.70oC, calculate the molar enthalpy of solution for potassium iodide.
227 kJ/mol
Determine the pH for a 0.100 mol/L solution of benzoic acid.
2.60
The decomposition of hydrogen peroxide to produce oxygen and water is used in some contact lens cleaning procedures. A small piece of platinum is used as a catalyst for this reaction. Assuming a closed system, the purpose of the platinum is to:
A. Shift the equilibrium towards the reactants
B. Alter the equilibrium concentrations
C. Decrease the time required to reach equilibrium
D. Shift the equilibrium towards the products
C
When butane undergoes a reaction with chlorine gas, the organic product is _________ in this _________ reaction.
A) dichlorobutane | addition
B) dichlorobutane | substitution
C) chlorobutane | addition
D) chlorobutane | substitution
D
What mass of aluminum is deposited during the electrolysis of molten aluminum bromide if 30.0 A flows through the cell for 4.85 h?
48.8g
Determine the enthalpy of combustion when 10.0 g of methane is combusted. The molar enthalpy of combustion for methane is – 802.5 kJ/mol.
500 kJ
The conjugate base of N2H5+(aq) is
a. HOH(l)
b. OH- (aq)
c. N2H4(aq)
d. N2H6 2+(aq)
C
What is the equilibrium law expression for the reaction: C(s) + O2(g) ↔ CO2(g)
KC= [CO2(g)] / [O2(g)]
1. Alkanes
2. Alkenes
3. Alkynes
The compound with the highest boiling point ____
The compound with the lowest boiling point ____
The most reactive compound ____
The least reactive compound ____
3321