問題一覧
1
When the acid HCl is mixed with the base KOH, which statement is false?
potassium (K) would be oxidized in the reaction
2
How much NaCl can be theoretically produced if 1.25 grams of sodium carbonate (Na2CO3) is combined with 0.03 L of 0.2 M HCl in the reaction below? (HCl = 36.5 g/mole; Na2CO3 = 106 g/mole; NaCl = 58 g/mole) 2 HCl(aq) + Na2CO3(s) ➔ 2 NaCl(aq) + H2CO3(aq)
0.348 g
3
Answer
it can form hydrogen bonds with the same molecule
4
A 0.038 mole sample of magnesium nitride (Mg3N2) is reacted with 0.43 moles of H2O. The actual yield of MgO is 3.60 g. What is the percent yield in the reaction below? (MgO = 40.3 g/mole) Mg3N2 + 3H2O → 2NH3 + 3MgO
78.4
5
If the molecule that contains the oxidized atom is called the reducing agent, which molecule is the reducing agent for the reaction below? CuO (s) + CO (g) → Cu (s) + CO2 (g)
CO
6
Which of the following reactions is incorrectly classified?
PbO (s) + C (s) ↔ Pb (s) + CO (g) (double-replacement)
7
In the generic reaction below, how many moles of reactant B will be consumed if there is 0.5 L of 3M reactant A used? Consider reactant B to be in excess. 2A + 3B ↔ C + 4D
2.3 moles
8
If 0.5 moles of H2O are reacted, how many moles of C2H2 would be produced in the reaction below? CaC2 (s) + 2H2O (g) → Ca(OH)2 (s) + C2H2 (g)
0.25 moles
9
What is the oxidation number on sulfur in SO32-?
4
10
Select the number of grams (g) of CO2 formed by the reaction of 0.153 mol C3H8 with excess O2. C3H8(g) + 5 O2(g) → 3 CO2(g) + 4 H2O(g)
20.2 g CO2
11
In which reaction is oxygen oxidized?
2H2O (l) → 2H2 (g) + O2 (g)
12
How many moles of oxide ions are present in a 1 L volume for a 1.27 M solution with Li2O?
1.27 M
13
Which statement is false regarding the molecule MgSO4?
the oxidation number of sulfur is -2
14
Answer
dipole-dipole forces
15
Which set of molecular interactions below can’t form hydrogen bonds?
HCl and HF
16
What is the new concentration (M) of sucrose after O.05 L of a stock 0.0250 M sucrose solution is diluted in a final volume of 0.25 L. 0.125 M 1.25 M 0.00500 M D) 8.00 M E) 2.53 M
0.00500 M
17
1) Which of the following is not an electrolyte when dissolved in water?
CBr4
18
Answer
SiH4
19
What is the volume (L) of 0.82 M HCl required to neutralize 1.25 grams of sodium carbonate (Na2CO3) based on the stoichiometry in the reaction below? (HCl = 36.5 g/mole; Na2CO3 = 106 g/mole) 2 HCl(aq) + Na2CO3(s) ➔ 2 NaCl(aq) + H2CO3(aq)
0.029 L
20
Determine how many moles of the limiting reactant Cu+ are required to form 100.0 g Cu2S in the balanced reaction below. (Cu2S = 159.2 g/mole) 2Cu+(aq) + S2–(aq) → Cu2S(s)
1.26 mol Cu+
21
Which of the following solutes has a limiting van't Hoff factor of 1 when dissolved in water and likely won’t significantly increase the boiling point or lower the freezing point?
PCl3