Chemistry Final
In the following list, which is the nonpolar molecule?
- CCl4
A 1.26 g sample of He gas has a pressure of 0.123 atm and a volume of 32.6 L. What is the temperature of the sample, in °C?
-118 °C
Calculate the freezing point of a 2.00 molal solution of the nonelectrolyte glucose. The freezing point constant for water is 1.86 °C/molal.
-3.72C
If 20.0 g acetylene is allowed to completely react with oxygen, how many grams of O2 are reacted? 2C2H2(g) + 5O2(g) → 4CO2(g) + 2H2O(g) - acetylene
-61.4g
1 mole of a gas occupies 22.4 L at ________.
0 °C and 760 mmHg.
What volume of a 2.00 M solution of sulfuric acid is needed to produce 0.0500 mol of sulfuric acid?
0.0250 L
At STP, how many moles of helium would occupy 1.00 L?
0.0446 moles
Magnesium sulfate reacts with barium chloride according to the following balanced equation. How many moles of barium sulfate are formed from 0.0831 mol of magnesium sulfate? MgSO4(aq) + BaCl2(aq) → BaSO4(s) + MgCl2(aq)
0.0831 mol
32.4 mL sample of H2SO4 requires 20.0 mL of 0.368 M NaOH for complete neutralization. What is the molarity of the acid? H2SO4 + 2NaOH → Na2SO4 + 2H2O
0.114 M
How many moles of MgO are produced when 0.250 mol of Mg reacts completely with O2? 2Mg(s) + O2(g) → 2MgO(s)
0.250mol
What volume of H2 (g) (at 750. mmHg and 25 °C) is produced from 50.0 mL of H2SO4 and of Al? 2Al(s) + 3H2SO4(aq) → Al2(SO4)3(aq) + 3H2(g)
0.265L
The volume of a gas with a pressure of 1.2 atm increases from 1.0 L to 4.0 L. What is the final pressure of the gas, assuming constant temperature?
0.30 atm
How many moles of oxygen gas can 0.882 mol of hydrogen peroxide produce if decomposition is complete? 2H2O2(l) → 2H2O(l) + O2(g)
0.441mol
The molarity of a solution of 5.00 g of KCl in 150. mL of solution is ________.
0.447 M
How many moles of hydrogen are needed to react with 0.234 mol of oxygen according to this equation? 2H2(g) + O2(g) → 2H2O(g)
0.468 mol
For the following question(s), refer to the following reaction, which is not yet balanced. CH4(g) + O2(g) → CO2(g) + H2O(g)
0.480 mol
What is the molarity of the solution obtained when 0.100 mol of copper sulfate are dissolved in 0.200 liters of solution?
0.500 M
How many g Al will react with 24.0 mL of 1.22 M H2SO4? 2Al(s) + 3H2SO4(aq) → Al2(SO4)3(aq) + 3H2(g)
0.527 g
How many moles of neon occupy a volume of 14.3 L at STP?
0.638 moles
A 15.0 mL sample of H2SO4 requires 25.0 mL of 0.876 M KOH for complete neutralization. What is the molarity of the acid?
0.730 M
How many moles of CaCl2 are in 250. mL of a 3.00 M of CaCl2 solution?
0.750 mol
When 35 mL of 0.92 M H2SO4 reacts with excess Al, how many L of H2 are formed at 23 °C and a pressure of 745 mmHg? 2Al(s) + 3H2SO4(aq) → Al2(SO4)3(aq) + 3H2(g)
0.80L
How many covalent bonds will a hydrogen atom normally make?
1
In this reaction, what is the correct coefficient for oxygen gas? ? H2(g) + ? O2(g) → ? H2O(g)
1
Which of the following correctly gives the best coefficients for the reaction below? ___N2H4(g) + ___H2O2(g) → ___N2(g) + ___H2O(g)
1,2,1,4
When barium chloride is allowed to react with silver nitrate to give barium nitrate and silver chloride, what are the coefficients for the balanced equation? ___BaCl2(aq) + ___AgNO3(aq) → ___AgCl(s) + ___Ba(NO3)2(aq)
1,2,2,1
What are the coefficients for the balanced equation? ___Al2(SO4)3(aq) + ___KOH(aq) → ___Al(OH)3(s) + ___K2SO4(aq)
1,6,2,3
If 0.500 mol of acetylene is allowed to completely react with oxygen, what is the final yield of CO2 in moles? 2 C2H2(g) + 5O2(g) → 4CO2(g) + 2H2O(g) - acetylene
1.00mol
Calculate the molality of the solution formed when of 50.0 g of the nonelectrolyte glucose (Molar mass 180.2) is dissolved in 0.250 kg of water.
1.11 molality
How many moles of oxygen are present in a cylinder of 25.0 liters at a temperature of and a pressure of 1.00 atm?
1.12 mol
In the reaction of aluminum and iron(III) oxide to form iron and aluminum oxide, ΔH is -850 kJ. How many moles of aluminum are reacted when 650 kJ of heat are released? 2Al(s) + Fe2O3(s) → 2Fe(s) + Al2O3(s) ΔH = -850 kJ
1.5 mol
If the heat of fusion for water is 334 J/g, how many joules are needed to melt 45.0 g of ice at 0.0 C?
1.50 × 104 J
What is the mass percent (m/m) concentration of a solution of 10.0 g of sodium chloride in of solution?
10%
The mass percent (m/m) concentration refers to the number of grams of solute in ________.
100 g of solution
A sample of helium has a temperature of 120. °C and pressure of 746 Torr. What is the temperature (in °C), when the pressure is 715 Torr?
104 C
What is the volume of 22.0 g of carbon dioxide at STP?
11.2 L
If the heat of vaporization for water is 2260 joules/g, how many kilojoules are released when 5.00 g of steam is converted to liquid at
11.3kJ
How many grams of sodium chloride are required to make 2.00 L of a solution with a concentration of 0.100 M?
11.7 g
A cyclopropane-oxygen mixture is used as an anesthetic. If the partial pressure of cyclopropane in the mixture is 334 mmHg and the partial pressure of the oxygen is 1.02 atm, what is the total pressure of the mixture in torr?
1110 Torr
A tank contains helium gas at 1.50 atm. What is the pressure of the gas in mmHg?
1140mmHg
The temperature of a 500. mL sample of gas increases from 150. K to 350. K. What is the final volume of the sample of gas, if the pressure in the container is kept constant?
1170 mL
When 25.0 g of NaCl is added to 175 g of water, the mass percent (m/m) NaCl is ________.
12.5%
How many kcal of heat are produced when 10.0 g of methane reacts with excess oxygen? The balanced equation is: CH4(g) + 2O2(g) → CO2(g) + 2H2O(g) + 802 kJ - methane
120kcal
At constant temperature, a sample of helium at 760. Torr in a closed container was compressed from to . What was the new pressure exerted by the helium on its container?
1270 Torr
How many grams of sodium sulfate react with 20.8 of barium chloride? Na2SO4(aq) + BaCl2(aq) → BaSO4(s) + 2NaCl2(aq)
14.2g
When 650. kJ of heat is produced, what mass of C2H6 is also produced? C2H4(g) + H2(g) → C2H6(g) + 32.5 kcal
144g
For the balanced equation, what is the coefficient for O2? ? C5H10 (l) + ? O2(g) → ? CO2(g) + ? H2O(g)
15
If the heat of fusion for water is 334 joules/g, how many kilojoules are needed to melt 45.0 g of ice at 0 °C?
15.0kJ
At 570. mmHg and 25 °C, a gas sample has a volume of 2270 mL. What is the final pressure (in mmHg) at a volume of 1250 mL and a temperature of 175 °C?
1560 mmHg
In the reaction of aluminum and iron(III) oxide to form iron and aluminum oxide, ΔH is -850 kJ. How many kJ are released when 10. g of Al react? 2Al(s) + Fe2O3(s) → 2Fe(s) + Al2O3(s) ΔH = -850 kJ
160 kJ
How many grams of hydrogen peroxide are needed to produce 90.0 g of water? 2H2O2(l) → 2H2O(l) + O2(g)
170. G
What is the percent yield of the reaction when 16.0 g of methane reacts with excess oxygen to give 8.00 g of carbon dioxide? The balanced equation is CH4(g) + 2O2(g) → CO2(g) + 2H2O(g) - methane
18.2%
How many grams of NO are required to produce 145 g of N2 in the following reaction? 4NH3(g) + 6NO(g) → 5N2(g) + 6H2O(l)
186g
For the balanced equation, what is the coefficient for C5H10? ? C5H10(l) + ? O2(g) → ? CO2(g) + ? H2O(g)
2
For the balanced equation, what is the coefficient for C6H14? ? C6H14(l) + ? O2(g) → ? CO2(g) + ? H2O(g)
2
For the following question(s), refer to the following reaction, which is not yet balanced. CH4(g) + O2(g) → CO2(g) + H2O(g) When the above equation is balanced, what is the correct coefficient for water?
2
In the following reaction, what is the correct coefficient for aluminum chloride? Al(s) + Cl2(g) → ? AlCl3(s)
2
In this reaction, what is the correct coefficient for hydrogen gas? ? H2(g) + ? O2(g) → ? H2O(g)
2
In this reaction, what is the correct coefficient for sodium chloride? Pb(NO3)2(aq) + ? NaCl(aq) → PbCl2(s) + ? NaNO3(aq)
2
The number of lone pairs in the water molecule is ________.
2
The heat of reaction in the combustion of graphite is -394 kJ/mol. The balanced reaction is: C(s) + O2(g) → CO2(g) - How many kJ are given off by the combustion of 88.0 g of graphite?
2 890 kJ
What is the molarity of a solution which contains 58.4 g of sodium chloride dissolved in of solution?
2.00M
The number of moles of oxygen gas needed to react with 4.00 mol of Mg is ________. 2Mg(s) + O2(g) → 2MgO(s)
2.00mol
A tank contains helium gas at 490. mmHg, nitrogen gas at 0.750 atm, and neon at 520. Torr. What is the total pressure in atm?
2.08atm
How many grams of barium sulfate can be made from 2.00 grams of barium chloride? BaCl2(aq) + Na2SO4(aq)→ BaSO4(s) + 2NaCl(aq)
2.24 g
Magnesium sulfate reacts with barium chloride according to the following balanced equation. If 1.20 g of magnesium sulfate is allowed to react with 10.0 g of barium chloride in a water solution, what is the theoretical yield of barium sulfate? MgSO4(aq) + BaCl2(aq) → BaSO4(s) + MgCl2(aq)
2.33g
What is the molarity of a solution containing 5.00 moles of KCl in 2.00 L of solution?
2.50 m
What is the molarity of a solution that contains 2.35 g of NH3 in 0.0500 L of solution?
2.76 M
At STP, what is the volume of 1.00 mol of carbon dioxide
22.4L
When 100.g Mg3N2 reacts with 75.0 g H2O, what is the maximum theoretical yield of NH3? Mg3N2(s) + 6H2O (l) → 3Mg(OH)2(aq) + 2NH3(g)
23.6g
What is the mass percent (m/m), of a solution prepared from 50.0 g NaCl and 150.0 g of water?
25.0%
A 1.00 g sample of an unknown gas has a pressure of 35.8 mmHg, a volume of 20.0 L and a temperature of 25 °C. What is the molar mass of the gas?
26.0g/mol
At STP, temperature and pressure have the values of
273 K and 760 mmHg
How many grams of sulfuric acid, H2SO4, are needed to make 250. mL of a 1.22 M solution?
29.9 g
Which of the following gives the balanced equation for this reaction? K3PO4(aq) + Ca(NO3)2(aq) → Ca3(PO4)2(s) + KNO3(aq)
2K3PO4 + 3Ca(NO3)2 → Ca3(PO4)2 + 6KNO3
For the following reaction, what is the correct coefficient for the H2? Fe(s) + HCl(aq) → FeCl3(aq) + ? H2(g)
3
What is the coefficient of hydrogen, H2, when the following equation is balanced? Al(s) + H2SO4(aq) → Al2(SO4)3(aq) + ? H2(g)
3
For the following question(s), refer to the following reaction, which is not yet balanced. CH4(g) + O2(g) → CO2(g) + H2O(g) - If 12.0 g of methane reacts completely with oxygen, what is the final yield of CO2 in grams?
33.0g
Rubbing alcohol is 70.0% isopropyl alcohol by volume. How many mL of isopropyl alcohol are in a full 1 pint (473 mL) container?
331 mL
A container of variable volume contains oxygen gas at a pressure of 550.0 kPa. At 25.0 °C, what is the new pressure inside the container if the container is allowed to expand from an initial volume of 5.20 L to a final volume to 7.25 L?
394kPa
Given the following equation, what is the correct form of the conversion factor needed to convert the number of moles of O2 to the number of moles of Fe reacted? 4Fe(s) + 3O2(g) → 2Fe2O3(s)
4 mol Fe/3 mol 02
Calculate the molarity of 60.05 g of acetic acid, HC2H3O2, dissolved in 0.250 L of solution.
4.00 m
In the reaction of iron(III) oxide with carbon to give carbon dioxide and water according to the following equation, 2.00 mol of iron(III) oxide and 3.00 mol of carbon can theoretically produce how many mol of iron? 2Fe2O3(s) + 3C(s) → 3CO2(g) + 4Fe(s)
4.00 mole
A 3.50 g sample of Al reacts with excess H2SO4. What volume of H2 gas is produced at a pressure of 735 mmHg and a temperature of 22 °C? 2Al(s) + 3H2SO4(aq) → Al2(SO4)3(aq) + 3H2(g)
4.88L
If 40.0 g of acetylene is allowed to react with 40.0 g of oxygen, how many grams of CO2 are formed? 2C2H2(g) + 5O2(g) → 4CO2(g) + 2H2O(g) acetylene
44.0g
How many grams of water are produced from the reaction of 40.3 g of oxygen according to this equation? 2H2(g) + O2(g) → 2H2O(g)
45.3g
A reaction between methane and hydrogen sulfide to produce carbon disulfide and hydrogen gas was carried out. CH4(g) + 2H2S(g) → CS2(g) + 4H2(g) A 32.0 g quantity of methane produced 70.0 g of carbon disulfide. What was the percent yield for this reaction?
46.1%
How many grams of chlorine gas are present in a 150. liter cylinder of chlorine held at a pressure of and
474g
What is the volume of 50.0 g of N2 gas at a pressure of 650. mmHg and a temperature of
49.3 L
For the balanced equation, what is the coefficient for CO2? ? C5H8(l) + ? O2(g) → ? CO2(g) + ? H2O(g)
5
Pentane (C5H12) reacts with oxygen (O2) to form carbon dioxide (CO2) and water (H2O) according to the following reaction. Answer the following question(s) about this reaction. C5H12(l) + ? O2(g) → ? CO2(g) + ? H2O(g) What is the coefficient for carbon dioxide in the balanced equation?
5
A gas sample in a closed, expandable container of initial volume 5.00 L was allowed to warm from to What was its new volume?
5.17 L
A gas sample contains 4.00 g of CH4. What is the volume of the sample at STP?
5.59L
A gas at 5.00 atm pressure was stored in a tank during the winter at 5.0 °C. During the summer, the temperature in the storage area reached 40.0 °C. What was the pressure in the gas tank then?
5.63 atm
A sample of nitrogen gas had a volume of 500. mL, a pressure in its container of and a temperature of What was the new volume of the gas when the temperature was changed to and the new pressure was
528mL
How many grams of water will 100. g of hydrogen peroxide produce? 2H2O2(l) → 2H2O(l) + O2(g)
53.0g
How many kilojoules are required to convert 115.0 g of ice at 0.0 °C to liquid water at The heat of fusion of water is 334 J/g, and the heat capacity of water is
53.8 kJ
How many mL of 1.24 M H2SO4 reacts with 1.26 g of Al? 2Al(s) + 3H2SO4(aq) → Al2(SO4)3(aq) + 3H2(g)
56.5mL
In the reaction of nitrogen gas with hydrogen gas to make ammonia, what is the theoretical yield of ammonia in grams if a 100. g quantity of hydrogen gas is used in the reaction?
563g
How many mL of 1.15 M KOH solution are needed to provide 0.665 mol of KOH?
578 mL
If atmospheric pressure on a certain day is 749 mmHg, what is the partial pressure of nitrogen, given that nitrogen is about 78% of the atmosphere?
580 mmHg
How many kilojoules are required to warm 25.0 g of water from 75.0 °C to 100.0 °C and convert it to steam at 100.0 °C? The heat of vaporization of water is 2260 joules/g, and the specific heat of water is 4.184 joules/g °C.
59.1 kJ
Methane reacts with oxygen to produce carbon dioxide, water and heat. How many kcal are produced when 5.00 g of methane react? CH4(g) + 2O2(g) → CO2(g) + 2H2O(g) + 802 kJ - methane
59.9kcal
Pentane (C5H12) reacts with oxygen (O2) to form carbon dioxide (CO2) and water (H2O) according to the following reaction. Answer the following question(s) about this reaction. C5H12(l) + ? O2(g) → ? CO2(g) + ? H2O(g) What is the coefficient for water in the balanced equation?
6
What is the correct form of the conversion factor needed to convert the number of moles of H2O to the number of moles of NH3 produced? Mg3N2(s) + 6H2O (l) → 3Mg(OH)2(aq) + 2NH3(g) 2 mol NH3
6 mol h2o
How many moles of magnesium are needed to react with 3.0 mol of O2? 2Mg(s) + O2(g) → 2MgO(s)
6.0mol
When 100.g Mg3N2 reacts with 75.0 g H2O, 15.0 g of NH3 is formed. What is the % yield? Mg3N2(s) + 6H2O(l) → 3Mg(OH)2(aq) + 2NH3(g)
63.6%
A diver exhales a bubble with a volume of 250. mL at a pressure of 2.42 atm and a temperature of 15 °C. What is the volume of the bubble when it reaches the surface where the pressure is 1.00 atm and the temperature is 27 °C?
630 mL
Find the mass of AlCl3 that is produced when 25.0 grams of Al2O3 react with HCl according to the following balanced equation. Al2O3(s) + 6HCl(aq) → 2AlCl3(aq) + 3H2O(l)
65.4g
For the reaction of carbon dioxide to form carbon monoxide and oxygen, ΔH is 570 kJ. How many grams of CO2 will react if 450 kJ is absorbed?
69g
What coefficient is placed in front of O2 to complete the balancing of the following equation? C5H8(l) + ? O2(g) → 5CO2(g) + 4H2O(g)
7
A rigid ball that contained air at 22 °C and 6.25 atm pressure was placed in an oven at a temperature of What was the new pressure inside the ball?
7.90 atm
A 2.35 g sample of KClO3 is reacted. How many mL of O2 gas is produced at a pressure of 740. mmHg and a temperature of 25 °C? 2KClO3(s) → 2KCl(s) + 3O2(g)
722mL
Which measurement describes the pressure of a gas?
725 mmHg
The unit of 1 atmosphere used to describe the pressure of a gas is equal to ________.
760mmHg
How many joules are required to convert 16.5 g of ice at 0.0 °C to liquid water at The heat of fusion of water is 334 J/g.
7720 J
Pentane (C5H12) reacts with oxygen (O2) to form carbon dioxide (CO2) and water (H2O) according to the following reaction. Answer the following question(s) about this reaction. C5H12(l) + ? O2(g) → ? CO2(g) + ? H2O(g) What is the coefficient for oxygen in the balanced equation?
8
When 48 mL of 12% (m/v) KCl is diluted to 72 mL, the KCl concentration is ________.
8.0% (m/v)
A 10.0 liter balloon was taken from a temperature of 25.0 °C and placed in a freezer at a temperature of What was the new volume if pressure is constant?
8.66liters
What mass of a 15.0% (m/m) NaOH solution contains 125 g NaOH?
833 g
In the reaction of silver nitrate with sodium chloride, how many grams of silver chloride will be produced from 100. g of silver nitrate when it is mixed with an excess of sodium chloride? The equation for the reaction is below.
84.4g
How many kJ are produced when 50.0 g of oxygen reacts with excess H2(g)? 2H2(g) + O2(g) → 2H2O(l) + 572 kJ
894kJ
A solution of artificial tears is 0.090% (m/m) sodium chloride. How many grams of sodium chloride are contained in 1.00 g of this solution?
9.0 × 10 -4 g
How many grams of H2O are needed to produce 150. g of Mg(OH)2? Mg3N2(s) + 6H2O (l) → 3Mg(OH)2(aq) + 2NH3(g)
92.6g
Copper(II) chloride can react with zinc metal to produce zinc chloride and copper metal. If 3.25 g of zinc is allowed to react with excess copper chloride, and 3.00 g of copper is produced, what is the percent yield for this reaction?
94.9%
Magnesium reacts with oxygen gas to produce magnesium oxide, light, and heat. This reaction is ________.
A combination
The solubility of KI is 50. g in 100. g of H2O at 20 °C. If 110. grams of KI are added to of H2O, ________.
A saturated solution will form
When the nonelectrolyte glucose is dissolved in water, the solution contains ________.
All glucose molecules.
The total pressure in a mixture of gases is equal to the partial pressure(s) of ________.
All the gases added together.
A barometer is a device for measuring ________.
Atmospheric pressure
If 100. g of sodium sulfate react with 100.g of barium chloride, which is the limiting reactant?
BaCl2(aq) + Na2SO4(aq) → BaSO4(s) + 2NaCl(aq) barium chloride
A balloon is filled with helium gas. For the following questions, select the letter of the balloon diagram that corresponds to the given change in condition The temperature is changed from 50. °C to -150 °C at constant pressure.
Ballon A
The shape of a molecule of water, H2O, is ________.
Bent
Name the product(s) of the complete combustion of any hydrocarbon.
CO2 + H2O
What is oxidized in this reaction? Ca(s) + H2SO4(aq) → CaSO4(aq) + H2(g)
Ca
Which of the following compounds contains an ionic bond?
CaO
The element in the following list with the lowest electronegativity is ________.
Cesium
The reaction of carbon with oxygen to produce carbon monoxide is an example of which class of reaction? 2C(s) + O2(g) → 2CO(g)
Combination
What is the classification for this reaction? SO3(g) + H2O(l) → H2SO4(aq)
Combination
The following reaction is an example of a ________ reaction. 2C2H6(g) + 7O2(g) → 4CO2(g) + 6H2O(g)
Combustion
The reaction of butane with oxygen is called ________.
Combustion
Hydrogen bonds are a major factor in the structure of ________.
DNA
The following reaction takes place when an electric current is passed through water. It is an example of a ________ reaction. 2H2O(l) 2H2(g) + O2(g)
Decomposition
The reaction of carbon dioxide to form carbon monoxide and oxygen is what type of reaction? 2CO2(g) → 2CO(g) + O2(g)
Decomposition
Complete the following statement: In Charles's law, the volume of a gas ________ when the ________ decreases.
Decrease, temperature
Complete the following statement: In Charles's law, the volume of a gas ________ when the ________ decreases.
Decreases, temperature
The main interactions between molecules of hydrogen chloride are examples of ________.
Dipole-dipole attractions
The ability of an atom to attract the shared electrons in a covalent bond is its ________.
Electronegativity
For the reaction of carbon dioxide to form carbon monoxide and oxygen, ΔH is + 570 kJ. This reaction is ________. 2CO2(g) → 2CO(g) + O2(g) ΔH = + 570 kJ
Endothermic
In the reaction of sodium hydroxide with sulfuric acid to give water and sodium sulfate, heat is released. Is this an exothermic or endothermic reaction?
Exothermic
When hydrogen and oxygen are combined in air, heat and light are given off. In terms of the energetics of this reaction, it may be classified as ________.
Exothermic
When iron oxide is heated with aluminum, one of the products is molten iron, and much smoke and light are given off. The reaction can be classified as a(n) ________ reaction.
Exothermic
Of the five elements Na, Al, S, Cl, F, the most electronegative is
F
In the reaction of hydrogen gas with oxygen gas to produce water, 1.00 mol of oxygen and 1.00 mol of hydrogen can produce 2.00 mol of water.
False
When 1.00 g of methane reacts, 802 kJ of energy is released. CH4(g) + 2O2(g) → CO2(g) + 2H2O(g) + 802 kJ - methane
False
When 1.00 mol of barium chloride reacts with 1.00 mol of silver nitrate, silver nitrate is the excess reactant.
False
When 1.00 mol of sodium chloride reacts with 0.500 mol of silver nitrate, sodium chloride is the limiting reagent.
False
What is oxidized in this reaction? Fe(s) + HCl(aq) → FeCl3 (aq) + H2(g)
Fe
In the following list, which is the polar molecule?
H2O
When 100.g Mg3N2 reacts with 75.0 g H2O, what is the limiting reactant? Mg3N2(s) + 6H2O (l) → 3Mg(OH)2(aq) + 2NH3(g)
H2O
Which of the following molecules can form hydrogen bonds?
H2O
Which of the following compounds contains a polar covalent bond?
HCl
If the electronegativity difference between elements X and Y is 2.1, the bond between the elements X-Y is ________.
Ionic
Which of the following elements has the lowest electronegativity?
Li
In the kinetic molecular theory of gas behavior, the assumption is made that gas molecules ________.
Move rapidly in random directions
Which of the following substances contains a nonpolar bond?
N2
Which of the following is a combination reaction?
N2 (g) + O2(g) → 2NO(g)
Which of the following is an oxidation-reduction reaction?
N2(g) + O2(g) → 2NO(g)
Of the five elements Na, Al, S, Cl, F, the least electronegative is
Na
Which products would result from the double replacement reaction between MgCl2(aq) and Na2CO3(aq)?
NaCl(aq) and MgCO3(s)
Water is a polar solvent and hexane (C6H14) is a nonpolar solvent. Which of the following correctly describes the solubility of the solute?
NaHCO3, soluble in water
Which one of the following compounds will be soluble in water?
NaOH
Which is the most polar bond in the following list?
O-H
What is reduced in this reaction? C2H4(g) + 3O2(g) → 2CO2(g) + 2H2O(g)
O2
Oil does NOT dissolve in water because ________.
Oil is non-polar and water is polar.
The lone pair of electrons in the ammonia molecule is located ________.
On the nitrogen atom
For the following question(s), refer to the following reaction, which is not yet balanced. CH4(g) + O2(g) → CO2(g) + H2O(g) - If 16.0 g of methane is allowed to react with 32.0 g of oxygen, what is the limiting reactant?
Oxygen
What is the limiting reactant when 2.00 mol of methane reacts with 2.00 mol of oxygen? The balanced equation is CH4(g) + 2O2(g) → CO2(g) + 2H2O(g) - methane
Oxygen
When 65.0 g of acetylene gas, C2H2, reacts with 180. g of oxygen, which reactant is the limiting reactant? 2C2H2(g) + 5O2(g) → 4CO2(g) + 2H2O(g) - acetylene
Oxygen
When the combined gas law is rearranged to solve for V2, the following is the correct expression:
P1V1T2 / P2T1
Which one of the following compounds will NOT be soluble in water?
PbS
When lead(II) nitrate reacts with sodium iodide, what is the correct formula for the product lead(II) iodide?
Pbl2
The water molecule has a dipole with the negative portion (the head of the arrow) ________.
Pointing toward the oxygen atom
A bond between C and F would be ________.
Polar Covalent
The HF bond can be classified as ________.
Polar Covalent
A solid that forms when its solubility is exceeded is called a
Precipitate
A kiloPascal is a unit of ________.
Pressure
In the kinetic molecular theory of gas behavior, particles of a gas tend to move ________ and collisions between them are ________.
Rapidly, elastic.
Ozone, O3, is an example of a molecule that has ________ structures.
Resonance
The NO3- ion is an example of a polyatomic ion with ________.
Resonance structures
The VSEPR theory allows us to determine the ________.
Shape of a molecule
What is the classification for this unbalanced reaction? Fe(s) + HCl(aq) → FeCl3(aq) + H2(g)
Single replacement
When a solid is converted directly to a gas, the change of state is called ________.
Sublimation
A balloon is filled with helium gas. For the following questions, select the letter of the balloon diagram that corresponds to the given change in conditions.
The balloon is put into a chamber whose pressure is less than the atmospheric pressure and at atmospheric temperature. Balloon C
A heating curve illustrates ________.
The changes in the temperature and physical state of a substance as it is heated.
How many kilojoules are required to warm 15.0 g of water from 75.0 °C to 100.0 °C and convert it to steam at 100.0 °C?
The heat of vaporization of water is 2260 J/g, and the specific heat of water is . 35.5 kJ
Which of the following correctly describes the process of inspiration (air entering the lungs)?
The lungs expand, causing their internal pressure to decrease.
A chemical equation is balanced when ________.
The number of atoms of each element is the same in both the reactants and products.
According to the kinetic molecular theory of gases, a gas can be compressed much more than a liquid or solid because ________.
The particles of a gas are very far apart.
In any balanced chemical equation, the number of each type of atom on both sides of the equation is ________.
The same
The heat of fusion for water is 334 J/g, and the heat of vaporization of water is 2260 J/g. How many joules are required to convert 10.0 g of ice at 0.00 °C to steam at 100. °C?
The specific heat of water is . 30 100 J
The amount of product that a calculation indicates as possible for a chemical reaction is known as the ________
Theoretical Yield
A molecule contains a central atom with three identical bonds to other atoms and one lone pair. The shape of this molecule is ________.
Trigonal pyramidal
The shape of a molecule of ammonia, NH3, is ________.
Trigonal pyramidal
The diatomic molecule N2 is held together by a(n) ________ covalent bond.
Triple
In the reaction of hydrogen gas with oxygen gas to produce water, 1.00 mol of oxygen gas can produce 2.00 mol of water, given sufficient hydrogen available.
True
In the reaction of hydrogen gas with oxygen gas to produce water, when 1.00 mol of oxygen and 1.00 mol of hydrogen react, hydrogen is the limiting reactant.
True
The heat of reaction is the change in energy that occurs during a chemical reaction at constant pressure.
Trye
Hydrogen sulfide, H2S, has a shape similar to ________.
Water
Acetic acid can be classified as a(n) ________.
Weak electrolyte
In this set of chemical reactions, which is a single replacement reaction?
Zn(s) + H2SO4(aq) → ZnSO4(aq) + H2(g)
Which of the following is an oxidation-reduction reaction?
Zn(s) + H2SO4(aq) → ZnSO4(aq) + H2(g)
A hydrogen bond is
an attraction between a hydrogen atom attached to N, O, or F and an N, O, or F atom attached to another molecule
In a solution, the solvent ________.
can be a solid, liquid, or gas
A solution of an electrolyte in water will
carry an electric current
In a ________ reaction, two or more elements or compounds combine to form one product.
combination
In the reaction of silver nitrate solution, which is colorless, with copper metal, metallic silver comes out of solution, and the solution turns blue. The blue of the new solution must be due to ________.
copper nitrate
When a red blood cell is placed in 5% NaCl, the red blood cell ________.
crenates
According to Avogadro's law, the volume of a gas ________.
directly related to the number of moles at constant temperature and pressure
Which of the following is hypotonic to a red blood cell?
distilled water
A solution containing a large concentration of dissolved ions can be classified as a(n) ________.
electrolyte
If 18.0 g of water is separated into hydrogen and oxygen, the theoretical yield of oxygen is
false
The dipole in the nitrogen-hydrogen bond points ________.
from the hydrogen to the nitrogen.
When a dialysis bag containing glucose, NaCl, and starch(colloid) is placed in distilled water, which substances will be found outside the dialysis bag?
glucose and NaCl
Calculate the freezing point of a solution of 1.00 mol of the nonelectrolyte glucose dissolved in 1.00 kg of water would be ________ the freezing point of a solution of 1.00 mol of the strong electrolyte KCl dissolved in 1.00 kg of water.
higher than
According to Avogadro's law, the volume of a gas ________.
is directly related to the number of moles at constant temperature and pressure
The solubility of carbon dioxide in water ________.
is lower as the temperature increases.
An autoclave is used to sterilize surgical equipment because ________.
it allows water to boil at temperatures above 100 °C
In the kinetic molecular theory of gas behavior, the distance between gas molecules is assumed to be ________ the diameter of the gas molecules.
large relative to
Vinegar is a solution of acetic acid (melting point 16.5 °C) in water. At room temperature vinegar is an example of a ________ solution.
liquid liquid
A solution with a pH of 4 is ________.
moderately acidic
Water has a boiling point of 100 °C, and alcohol has a boiling point of 78 °C, even though water is a smaller molecule. This large difference in boiling point is due to ________.
more hydrogen bonds between the water molecules
When the weak electrolyte HF is dissolved in water, the solution contains ________.
mostly HF molecules and a few H+ and F- ions.
The O-H bond in water is polar because ________
oxygen is much more electronegative than hydrogen
When two or more equivalent dot structures can be written for a given molecule it is said to have ________ structures.
resonance
When some of the sugar added to iced tea remains undissolved at the bottom of the glass, the solution is ________.
saturated
The diatomic molecule Cl2 is held together by a(n) ________ covalent bond.
single covalent bond
Double and triple bonds form because ________.
single covalent bonds do not give all of the atoms in the molecule eight valence electrons.
In the reaction of silver nitrate with copper metal, metallic silver comes out of solution, and the solution turns blue. This as a ________ reaction.
single replacement
Ammonium chloride, NH4Cl, is blank in water
soluble
When sucrose, C12H22O11, is dissolved in water, the sucrose is classified as the ________.
solute
A solution is prepared by dissolving 2 g of KCl in 100 g of H2O. In this solution, H2O is the
solvent
In the reaction of silver nitrate and sodium chloride to produce solid silver chloride, sodium ions and nitrate ions are ________.
spectator ions
The carbon tetrachloride molecule, CCl4, has a ________ shape.
tetrahedral
The shape of a molecule of methane, CH4, is ________.
tetrahedral
The shape of the polyatomic ammonium ion, NH4+ is ________.
tetrahedral
When KCl dissolves in water, ________.
the K+ ions are attracted to the partially negative oxygen atoms of the water molecules
In order to calculate the total number of calories needed to melt 1 g of a solid and then convert it to a gas, you must know ________.
the heat of fusion, the specific heat, and the heat of vaporization of the substance
The pressure exerted by a gas on its container is directly proportional to ________.
the number of molecules of gas in the sample
Vapor pressure can be described as ________.
the pressure exerted by a gas above the surface of its liquid
A burn from steam at 100 °C is expected to be more severe than a burn from boiling water at because ________.
the steam will give off a large amount of heat as it condenses.
The shape of the ammonia molecule is ________.
trigonal pyramidal
In the following reaction, when 91.6 g of Na reacts with 32.0 g of O2, 123.6 g of Na2O is formed. 4Na(s) + O2(g) → 2Na2O(s).
true
At 26 °C, the solubility of sodium chloride is 36 g/100 mL of solution. How would you describe a solution of 10 g of sodium chloride in 100 mL of solution at room temperature?
unsaturated
Gout is due to the deposition of crystals of ________ in the joints.
uric acid
The pressure exerted by the particles of vapor above a liquid is called the ________ pressure.
vapor
According to the kinetic molecular theory of gases, particles of a gas ________.
very far apart