Unit 3 CHEM 101 Homework
hydrogen bonding
Ammonia and hydrogen fluoride both have unusually high boiling points due to _____
C₆H₁₂O₆(s) + 6O₂(g) → 6CO₂(g) + 6H₂O(g)
Balance the following chemical equation (if necessary) for the combustion reaction of glucose:
2 H₂SO₄(aq) + Pb(OH)₄(s) → Pb(SO₄)₂(s) + 4 H₂O(l)
Balance the following chemical equation (if necessary):
4 Si₂H₃(s) + 11 O₂(g) → 8 SiO₂(g) + 6 H₂O(g)
Balance the following chemical equation (if necessary):
CoSO₄ and H₂O
Complete the following chemical reaction and indicate the products. CoSO₄ • H₂O(s) + heat →
8.70 mol CO2 x (2 mol C4H10 / 8 mol CO2) x (58.14 g C4H10 / 1 mol C4H10) = 126 g C4H10
Determine the number of grams of C4H10 that are required to completely react to produce 8.70 mol of CO2 according to the following combustion reaction: 2C₄H₁₀(g) + 13O₂(g) →8 CO₂(g) +10 H₂O(g)
He
Dispersion forces would be weakest in which of the following substances?
2 mol
If 2.00 moles of H₂ and 1.55 moles of O₂ react how many moles of H₂O can be produced in the reaction below? 2 H₂(g) + O₂(g) → 2 H₂O(g)
6.250 mol
If 50.0 g of H₂ and 100.0 g of O₂ react, how many moles of H₂O can be produced in the reaction below? 2 H₂(g) + O₂(g) → 2 H₂O(g)
all of the above
If the molecules in a liquid have a strong attraction for each other, which of the following properties has a relatively high value? A) boiling point B) viscosity C) surface tension D) all of the above E) none of the above
vapor pressure
If the molecules in a liquid have a weak attraction for each other, which of the following properties has a relatively high value? A) boiling point B) surface tension C) vapor pressure D) viscosity E) all of the above
liquid
Predict the physical state of ammonia at -50 °C (Mp = -77 °C, Bp = -33 °C) and normal atmospheric pressure.
Li₂O
What is the predicted product from the following combination reaction? Li(s) + O₂(g) + heat →
Mg₃N₂
What is the predicted product from the following combination reaction? Mg(s) + N₂(g) + heat →
dispersion forces
What is the strongest intermolecular force in a liquid containing molecules with nonpolar bonds? A) covalent bonds B) dipole forces C) dispersion forces D) hydrogen "bonding" forces E) none of the above
copper (II) sulfate pentahydrate
What is the systematic name for CuSO₄ • 5H₂O?
active metal
What is the term for a metal that undergoes reaction with water at room temperature?
0.558 L
What is the volume of oxygen gas at STP from the decomposition of 10.8 g of mercuric oxide (216.59 g/mol)? __HgO(s) + heat → __Hg(l) + __O₂(g)
2,3,2
What numbers belong in the blank spaces to fully balance the following reaction? __Fe (s) + __Cl₂ (g) → __FeCl₃ (s)
combination
What type of reaction is represented by the following equation: 2Na(s) + Cl₂(g) → 2NaCl(s) A) combination B) decomposition C) double displacement D) single displacement
redox (oxidation-reduction)
What type of reaction is represented by the following equation: C₄H₈(g) + 6O₂(g) → 4CO₂(g) + 4H₂O(g)
10.0 mL
What volume of oxygen gas reacts with 20.0 mL of chlorine gas? (Assume temperature and pressure remain constant.) __ HCl(g) + __O₂(g) → __Cl₂(g) + __H₂O(g)
5.00 mL
What volume of oxygen gas reacts with 20.0 mL of hydrogen chloride? (Assume temperature and pressure remain constant.) __ HCl(g) + __O₂(g) → __Cl₂(g) + __H₂O(g)
15.0 L
What volume of oxygen gas reacts with 30.0 L of sulfur dioxide gas? (Assume temperature and pressure remain constant.) __SO₂(g) + __O₂(g) → __SO₃(g)
increasing dispersion interactions
Which best explains why the trend in noble gas boiling points increases down the group?
I2
Which of the following halogens would have the highest boiling point?
solid ⟶ gas
Which of the following phase changes represents sublimation? A) gas ⟶ liquid B) liquid ⟶ gas C) liquid ⟶ solid D) solid ⟶ liquid E) solid ⟶ gas
24
A s'more requires 2 graham cracker squares, 1 marshmallow, and 3 chocolate pieces. If an entire chocolate bar contains 12 chocolate pieces, a marshmallow bag contains 40 marshmallows, and a graham cracker package contains 48 squares, how many s'mores can you make from 8 chocolate bars, one bag of marshmallows, and a package of graham crackers?
4.2 mol N2H4 × (4 mol NH3 / 3 mol N2H4) = 5.6 mol NH3
According to the balanced reaction below, calculate the moles of NH₃ that form when 4.2 mol of N₂H₄ completely reacts 3N₂H₄(l) → 4 NH₃(g) + N₂(g)
5.00 x 10² cal
Calculate the number of calories required to raise 10.0 g of water from 25.0 °C to 75.0 °C. The specific heat of water is 1.00 cal/(g x °C).
mass-volume problem
Classify the following type of stoichiometry problem: "How many grams of cobalt must react with an excess volume of hydrochloric acid to produce 25.0 mL of hydrogen gas?"
mass-mass problem
Classify the following type of stoichiometry problem: "How many grams of zinc must react with an excess volume of hydrochloric acid to yield 0.500 g of zinc chloride?"
volume-volume problem
Classify the following type of stoichiometry problem: "How many liters of carbon monoxide gas react with an excess volume of oxygen to give 125 mL of carbon dioxide gas?"
0.750 g Al(OH)3 x (1 mol Al(OH)3 / 78.00 g Al(OH)3) x (3 mol HCl / 1 mol Al(OH)3) x (36.46 g HCl / 1 mol HCl) = 1.05 g HCl
Determine the number of grams of HCl that can react with 0.750 g of Al(OH)3 according to the following reaction: Al(OH)3(s) + 3HCl(aq) → AlCl3(aq) + 3H20(aq)
17.4 g
How many grams of NO will be produced from 80.0 g of NO₂ reacted with excess water in the following chemical reaction? 3 NO₂(g) + H₂O(l) → 2 HNO₃(g) + NO(g)
2.43 x 10-4 g KClO3 x (1 mol KClO3 / 12.55 g KClO3) x (3 mol O2 / 2 mol KClO3) x (32.00 g O2 / 1 mol O2) = 9.52 x 10-5 g O2
How many grams of oxygen gas are produced with 2.43x10-4 g of KClO3 are completely reacted according to the following chemical equation: 2KClO3(s) → 2 KCl(s) + 3O2(g)
2 mol B x (1 mol C / 2 mol B) = 1 mol C
How many moles of C are formed upon complete reaction of 2 mol B according to the generic chemical reaction: A + 2B → C
0.313 mol
How many moles of ammonia would be required to react exactly with 0.470 moles of copper(II) oxide in the following chemical reaction? 2 NH₃(g) + 3 CuO(s) → 3 Cu(s) + N₂(g) + 3 H₂O(g)
101% (0.925/0.914 x 100)
Starting with 0.657 g of lead(II) nitrate, a student collects 0.925 g of precipitate. If the calculated mass of precipitate is 0.914 g, what is the percent yield?
Li₂CO₃, H₂O, and CO₂
What are the predicted products from the following decomposition reaction? LiHCO₃(s) + heat →
Ca(C₂H₃O₂)₂ and H₂O
What are the predicted products from the following neutralization reaction? HC₂H₃O₂(aq) + Ca(OH)(aq) →
BaSO₄ and KCl
What are the products from the following double-replacement reaction? BaCl₂(aq) + K₂SO₄(aq) →
Cu and ZnSO₄
What are the products from the following single-replacement reaction? Zn(s) + CuSO₄(aq) →
HCl, NaHCO₃
What are the reactants in the following equation: HCl(aq) + NaHCO₃(aq)→ CO₂(g) + H₂O(l) + NaCl(aq)
104.5 degrees
What is the experimentally observed bond angle in a water molecule?
4 Fe(s) + 3 O₂(g) → 2 Fe₂O₃(s)
Write a balanced chemical equation based on the following description: iron metal reacts with oxygen gas to produce solid iron(III) oxide
2 Cr(s) + 3 I₂(s) → 2 CrI₃(s)
Write a balanced chemical equation based on the following description: solid chromium reacts with solid iodine to form solid chromium(III) iodide.
Before (mol): 45.2, 76.5, 0, 0 Change (mol): -38.3, -76.5, 76.5, 76.5 After (mol): 6.9, 0, 76.5, 76.5 mol CO2 = 76.5 mol
Consider the balanced chemical reaction below. What is the maximum number of moles of CO₂ that can be produced if 45.2 mol of C₂H₄O₂ and 76.5 mol of O₂ react? C2H4O2(g) + 2O2(g) → 2 CO2(g) + 2H2O(g)
21.8%
What is the percentage of water in NiCl₂ • 2H₂O?
surface tension
Which term is a measure of the energy required to increase the surface area of a liquid?
Ca(C₂H₃O₂)₂(aq) + Na₂CO₃(aq) → CaCO₃(s) + 2 NaC₂H₃O₂(aq)
Balance the following chemical equation (if necessary):
propionic acid (Bp @ 760 mm Hg = 141 °C)
Consider the following liquids with similar molar masses. Predict which has the strongest intermolecular attraction based only on boiling point data. A) butyl alcohol (Bp @ 760 mm Hg = 117 °C) B) ethyl ether (Bp @ 760 mm Hg = 35 °C) C) pentane (Bp @ 760 mm Hg = 36 °C) D) propionic acid (Bp @ 760 mm Hg = 141 °C) E) propyl chloride (Bp @ 760 mm Hg = 47 °C)
2 mol
How many moles of carbon monoxide react with 1 mol of oxygen gas according to the balanced chemical equation? 2 CO(g) + O₂(g) + heat → 2 CO₂(g)
2.50 mol
How many moles of hydrogen gas are produced from 5.00 mol of water and an excess amount of lithium metal? __Li(s) + __H₂O(l) → __LiOH(aq) + __H₂(g)
2.00 mol
How many moles of hydrogen iodide are produced from 1.00 mol of iodine? __H₂(g) + __I₂(g) __HI(g)
1.13 mol
How many moles of nitrogen gas would be produced if 3.40 moles of copper(II) oxide were reacted with excess ammonia in the following chemical reaction? 2 NH₃(g) + 3 CuO (s) → 3 Cu(s) + N₂(g) + 3 H₂O(g)
2
How many pairs of nonbonding electrons are in a water molecule? A) 0 B) 1 C) 2 D) 3 E) 4
0.5 mol
If you have 1 mol Xe and 1 mol F₂, how many moles of XeF₄ can you create in the following chemical reaction? Xe (g) + 2 F₂ (g) → XeF₄ (g)
dispersion and dipole-dipole
In a molecule of HI, what intermolecular forces are present?
0.080 g
In an experiment, 0.327 g of zinc metal reacts to produce 0.407 g of zinc oxide. Using the conservation of mass law, predict the mass of reacting oxygen gas. 2 Zn(s) + O₂(g) + heat → 2 ZnO(s)
8.792 g
In an experiment, 5.585 g of iron metal reacts with 3.207 g of yellow sulfur. Using the conservation of mass law, predict the mass of product. Fe(s) + S(s) FeS(s)
4
What is the coefficient in front of the NO when the equation below is balanced? NH₃(g) + O₂ (g) → NO(g) + H₂O (g)
Actual yield is how much is actually produced in a reaction (it has to be given or measured), and theoretical yield is a calculation that has to be done.
What is the difference between actual yield and theoretical yield?
9.71 g
What is the mass in grams of H₂ that can be formed from 54.6 grams of NH₃ in the following reaction? 2 NH₃(g) → 3 H₂(g) + N₂(g)
14.5 g
What is the mass of mercuric oxide (216.59 g/mol) that decomposes to release 0.750L of oxygen gas at STP? __HgO(s) + heat → __Hg(l) + __O₂(g)
CaO
What is the predicted product from the following combination reaction? Ca(s) + O₂(g) + heat →
15.0 L
What volume of oxygen gas reacts with 30.0 L of sulfur trioxide gas? (Assume temperature and pressure remain constant.) __SO₂(g) + __O₂(g) → __SO₃(g)
the hydrogen bonds in ice
Which of the following accounts for the unusually high melting point of ice?
Ice has a greater volume than an equal mass of water.
Which of the following explains why ice floats on water?
all of the above
Which of the following formulas represents an element in its natural state?
all of the above
Which of the following is an observed property of liquids?
change in color
Which of the following is evidence for a chemical reaction?
Mg
Which of the following metals reacts with aqueous Al(NO₃)₃? Partial Activity Series: Mg > Al > Zn > (H) > Cu
none of the above
Which of the following metals reacts with aqueous FeSO₄? Partial Activity Series: Fe > Co > (H) > Cu > Ag
Na
Which of the following metals reacts with water at room temperature?
all of the above
Which of the following properties of water is much higher than predicted? A) melting point B) boiling point C) heat of fusion D) heat of vaporization E) all of the above
FeSO₄(aq) + K₂S(aq) → FeS(s) + K₂SO₄(aq)
Which of the following reactions is a precipitation reaction?
H₃(aq) + HF(aq) → NH₄⁺(aq) + F⁻(aq)
Which of the following reactions is an acid-base reaction?
A + BX → AX + B
Which of the following represents the generic form of a single-displacement reaction? A) A + BX → AX + B B) AB → A + B C) AX + BY → AY + BX D) A + B → AB
all of the above
Which of the following solid compounds is soluble in water? A) Na₂CO₃ B) CuC₂H₃O₂ C) AgNO₃ D) all of the above E) none of the above
Solid sodium carbonate is heated to give solid sodium oxide and carbon dioxide gas.
Which of the statements below best describes the following reaction? Na₂CO₃(s) + heat → Na₂O(s) + CO₂(g)
condensation
Which one of the following phase changes would be exothermic? A) sublimation B) vaporization C) condensation D) melting
it is an endothermic process
Which one of the following statements would be true about vaporization?
viscosity
Which term is a measure of the resistance to flow in a liquid?
2 FeCl₃(aq) + 3 (NH₄)₂S(aq) → 6 NH₄Cl(aq) + Fe₂S₃(s)
Write a balanced chemical equation based on the following description: aqueous iron(III) chloride reacts with aqueous ammonium sulfide to make aqueous ammonium chloride and solid iron(III) sulfide