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introductory chemistry concepts

Questions and Answers of Introductory Chemistry Concepts

Assume that 50 g of KCl is dissolved in 100 g of water at 100 °C and the solution is allowed to cool to 20 °C. (a) How much KCl remains in solution?(b) How much KCl crystallizes from the
State whether each of the following solutions is saturated, unsaturated, or supersaturated. (a) 120 g NaC2H3O2 in 100 g of water at 70 °C(b) 120 g NaC2H3O2 in 100 g of water at 80 °C(c) 120 g
State whether each of the following solutions is saturated, unsaturated, or supersaturated.(a) 100 g NaC2H3O2 in 100 g of water at 25 °C(b) 100 g NaC2H3O2 in 100 g of water at 55 °C(c) 100 g
The solubility of rock salt is 40 g/100 g water at 30 °C. If a solution contains 10 g of rock salt in 25 g of water at 30 °C, is the solution saturated, unsaturated, or supersaturated?
The solubility of sugar is 110 g/100 g water at 30 °C. If a solution contains 25 g of sugar in 25 g of water at 30 °C, is the solution saturated, unsaturated, or supersaturated?
Calculate the mass/mass percent concentration for each of the following solutions.(a) 1.25 g NaCl in 100.0 g of solution(b) 2.50 g K2Cr2O7 in 95.0 g of solution(c) 10.0 g CaCl2 in 250.0 g of
Calculate the mass/mass percent concentration for each of the following solutions.(a) 20.0 g KI in 100.0 g of water(b) 2.50 g AgC2H3O2 in 95.0 g of water(c) 5.57 g SrCl2 in 225.0 g of
Write three pairs of unit factors for each of the following aqueous solutions given the mass/mass percent concentration.(a) 1.50% KBr(b) 2.50% AlCl3(c) 3.75% AgNO3(d) 4.25% Li2SO4.
Write three pairs of unit factors for each of the following aqueous solutions given the mass/mass percent concentration.(a) 3.35% MgCl2(b) 5.25% Cd(NO3)2(c) 6.50% Na2CrO4(d) 7.25% ZnSO4.
What mass of solution contains the following amount of solute?(a) 5.36 g of glucose in a 10.0% solution(b) 25.0 g of sucrose in a 12.5% solution.
What mass of solution contains the following amount of solute?(a) 35.0 g of hydrochloric acid in a 5.00% solution(b) 10.5 g of acetic acid in a 4.50% solution.
What mass of solute is dissolved in the following solutions?(a) 85.0 g of 2.00% FeBr2 solution(b) 105.0 g of 5.00% Na2CO3 solution.
What mass of solute is dissolved in the following solutions?(a) 10.0 g of 2.50% K2CO3 solution(b) 50.0 g of 5.00% Li2SO4 solution.
What mass of water is necessary to prepare the following solutions?(a) 100.0 g of 5.00% nitric acid, HNO3(b) 250.0 g of 10.0% NaOH solution.
What mass of water is necessary to prepare the following solutions?(a) 250.0 g of 0.90% saline solution(b) 100.0 g of 5.00% sugar solution.
Calculate the molar concentration for each of the following solutions.(a) 1.50 g NaCl in 100.0 mL of solution(b) 1.50 g K2Cr2O7 in 100.0 mL of solution(c) 5.55 g CaCl2 in 125 mL of
Calculate the molar concentration for each of the following solutions.(a) 1.00 g KCl in 75.0 mL of solution(b) 1.00 g Na2CrO4 in 75.0 mL of solution(c) 20.0 g MgBr2 in 250.0 mL of
Write two pairs of unit factors for the following aqueous solutions given the molar concentration.(a) 0.100 M LiI(b) 0.100 M NaNO3(c) 0.500 M K2CrO4(d) 0.500 M ZnSO4.
Write two pairs of unit factors for the following aqueous solutions given the molar concentration.(a) 0.150 M KBr(b) 0.150 M Ca(NO3)2(c) 0.333 M Sr(C2H3O2)2(d) 0.333 M NH4Cl.
What volume of solution contains the stated amount of solute?(a) 2.50 g solute in 0.325 M KNO3(b) 2.50 g solute in 0.325 M AlBr3(c) 2.50 g solute in 1.00 M Co(C2H3O2)2(d) 2.50 g solute in 1.00 M
What volume of solution contains the stated amount of solute?(a) 10.0 g solute in 0.275 M NaF(b) 10.0 g solute in 0.275 M CdCl2(c) 10.0 g solute in 0.408 M K2CO3(d) 10.0 g solute in 0.408 M
What is the mass of solute in each of the following solutions?(a) 2.25 L of 0.200 M FeCl3(b) 2.25 L of 0.200 M KIO4(c) 50.0 mL of 0.295 M ZnSO4(d) 50.0 mL of 0.295 M Ni(NO3)2.
What is the mass of solute in each of the following solutions?(a) 1.00 L of 0.100 M NaOH(b) 1.00 L of 0.100 M LiHCO3(c) 25.0 mL of 0.500 M CuCl2(d) 25.0 mL of 0.500 M KMnO4.
A hospital glucose solution is analyzed to verify its concentration. A 10.0 mL sample with a mass of 10.483 g is evaporated to dryness. If the solid glucose residue has a mass of 0.524 g, what
A hospital saline solution is analyzed to confirm its concentration. A 50.0 mL sample with a mass of 50.320 g is evaporated to dryness. If the solid sodium chloride residue has a mass of 0.453 g,
Concentrated hydrochloric acid is 12 M. What is the molarity of an HCl solution prepared by diluting 10.0 mL of concentrated acid to a total volume of 250.0 mL?
Concentrated acetic acid is 17 M. What is the molarity of an CH3COOH solution prepared by diluting 50.0 mL of concentrated acid to a total volume of 500.0 mL?
Concentrated sulfuric acid is 18 M. What volume of H2SO4 is diluted with distilled water to prepare 2.50 L of 0.10 M H2SO4?
Concentrated nitric acid is 16 M. What volume of HNO3 is diluted with distilled water to prepare 5.00 L of 0.10 M HNO3?
Given that 50.0 mL of 0.125 M silver nitrate reacts completely with 15.0 mL magnesium iodide solution according to the unbalanced equation: MgI2(aq) + AgNO3(aq) → AgI(s) + Mg(NO3)2(aq)(a) What is
Given that 25.0 mL of 0.170 M potassium iodide reacts completely with 0.209 M mercury(II) nitrate solution according to the unbalanced equation: Hg(NO3)2(aq) + KI(aq) → HgI2(s) + KNO3(aq)(a) What
In foggy weather, automobile headlights demonstrate the Tyndall effect. What is the approximate size of water droplets in the fog?
In a smoky auditorium, stage lights often demonstrate the Tyndall effect. What is the approximate size of smoke particles in the auditorium?
Explain why scuba divers use a special gas mixture of oxygen and helium, rather than compressed air, when they dive to depths greater than 125 feet.
Calculate the solubility of nitrogen in blood for a scuba diver at a depth of 125 feet and a pressure of 4.68 atm. The solubility of nitrogen gas is 0.0019 g/100 g blood at normal pressure.
Calculate the mass of sulfur dioxide gas in 1.00 L of saturated solution at 20 °C. The solubility of SO2 at 20 °C is 22.8 g/100 mL.
Calculate the mass of chlorine gas in 500 mL of saturated solution at 20 °C. The solubility of Cl2 at 20 °C is 0.63 g/100 mL.
Ethyl ether, C4H10O, is 7% miscible in water. Explain why ether is only partially miscible even though molecules contain an electronegative oxygen atom.
Explain the decrease in solubility for the following alcohols in water. Alcohol ethanol, C₂H5OH pentanol, C5H₁1OH hexanol, C6H₁3OH decanol, C₁0H21OH Solubility miscible 2.2 g/100 mL
Phenol, C6H5OH, is 7% soluble in water. Explain why phenol is only partially soluble even though molecules contain an electronegative oxygen atom.
Explain the decrease in solubility for the following acids in water. Acid CH3COOH acetic acid, pentanoic acid, C4H₂COOH hexanoic acid, C5H₁₁COOH decanoic acid,
Identify the solutes and solvents in the following solutions.(a) 80-proof ethyl alcohol (40% ethanol in water)(b) 190-proof ethyl alcohol (95% ethanol in water).
Predict whether water or chloroform, CHCl3, is a better solvent for each of the following household substances.(a) Grease(b) Maple syrup(c) Food color(d) Gasoline.
A vinegar solution is 5.00% acetic acid, CH3COOH. What is the molarity of CH3COOH in vinegar? (Assume the density is 1.01 g/mL.)
A bleach solution is 5.00% sodium hypochlorite, NaClO. What is the molarity of NaClO in a bleach? (Assume the density is 1.04 g/mL.)
Which elements are more electronegative: metals or nonmetals?
Sketch a graph of pressure versus inverse volume, assuming temperature is constant. Label the vertical axis P and the horizontal axis 1/V.
State five characteristics of an ideal gas according to the kinetic theory.
Distinguish between a real gas and an ideal gas.
A sealed container holds the gases He, Ne, and Ar. Which of these gases corresponds to each of the following descriptions?(a) Highest kinetic energy(b) Lowest kinetic energy(c) Fastest
A sealed container holds the gases H2, N2, and O2. Which of these gases corresponds to each of the following descriptions?(a) Highest kinetic energy(b) Lowest kinetic energy(c) Fastest
How many moles of helium gas occupy 5.00 L at 373 K and 1.75 atm?
How many moles of helium gas occupy 10.0 L at 100 K and 3.50 atm?
If 0.500 mol of helium gas occupies 5.00 L at 25 °C, what is the pressure in atmospheres?
If 1.25 mol of helium gas occupies 5.00 L at 2.25 atm, what is the temperature in degrees Celsius?
What is standard atmospheric pressure (in cm) measured by a barometer filled with water? (Given: Mercury is 13.6 times more dense than water.)
What is standard atmospheric pressure (in cm) measured by a barometer filled with alcohol? (Given: Mercury is 17.2 times more dense than alcohol.)
A deep-sea scuba tank contains oxygen and helium gases. If the partial pressures of the gases are 35 atm and 125 atm, what is the total pressure (in psi)?
A bicycle tire contains nitrogen, oxygen, and argon gases. If the partial pressures are 51.0 psi, 13.5 psi, and 0.5 psi, what is the total pressure (in atm)?
The decomposition of baking soda produces carbon dioxide gas. If 42.5 mL of wet gas is collected over water at 22 °C and 764 mm Hg, what is the volume of dry gas at STP conditions? (The vapor
Calcium metal and water produce hydrogen gas. If the volume of wet gas collected over water is 95.0 mL at 20 °C and 758 mm Hg, what is the volume of dry gas at STP conditions? (The vapor pressure
What pressure (in atm) is exerted by 1.51 x 1023 oxygen molecules at 25 °C in a 5.00 L container?
What volume (in liters) is occupied by 3.38 x 1022 nitrogen molecules at 100 °C and 255 mm Hg?
Natural gas contains methane, CH4, ethane, C2H6, and hydrogen sulfide, H2S. Which molecules have the fastest velocity?
Bottled gas for recreational vehicles contains propane, C3H8, and butane, C4H10. Which molecules have the faster velocity?
A sample of chlorine gas occupies 1550 mL at 0.945 atm and 50 °C. What is the mass of the sample?
A sample of fluorine gas occupies 855 mL at 710 mm Hg and 155 °C. What is the mass of the sample?
If the surface area of a human body is 255 square inches, what is the total weight of the atmosphere on a human body expressed in pounds?
If the surface area of a human hand is 165 square centimeters, what is the total weight of the atmosphere on a human hand expressed in pounds?
Which of the following gases has a density of 2.14 g/L at STP: H2, O2, O3?
Which of the following gases has a density of 5.40 g/L at STP: H2S, SO3, CF2Cl2?
A sample of unknown gas has a mass of 1.95 g and occupies 3.00 L at 1.25 atm and 20 °C. What is the molar mass of the unknown gas?
A 5.00 mol sample of iron(III) oxide is heated with 5.00 mol aluminum metal and converted to molten iron. Identify the limiting reactant, and calculate the moles of iron produced given the unbalanced
A sample of unknown gas has a mass of 2.85 g and occupies 750 mL at 760 mm Hg and 100 °C. What is the molar mass of the unknown gas?
Given that the air pressure inside an automobile tire is 34.0 psi, express the pressure in each of the following units:(a) atm(b) cm Hg(c) torr(d) kPa.
Which of the following expresses the greatest gas pressure: 1 atm, 1 in. Hg, 1 torr, 1 cm Hg, 1 mm Hg, or 1 psi?
Which of the following are observed properties of gases?(a) Variable shape(b) Expand uniformly(c) Compress infinitely(d) Mix with other gases.
Meteorologists state that a “falling” barometer indicates an approaching storm. Given a barometric pressure of 27.5 in. Hg, express the pressure in each of the following units of
Which of the following is not an observed property of gases? (a) Gases vary in shape and volume(b) Gases expand infinitely(c) Gases compress infinitely(d) Gases have low density(e) Gases mix
Indicate whether gas pressure increases or decreases with each of the following changes in a sealed container:(a) Increasing the temperature(b) Increasing the volume(c) Increasing the number of
Which of the following decreases gas pressure: increasing volume, increasing temperature, or increasing the number of molecules?
Which of the following are observed properties of gases?(a) Variable volume(b) Expand infinitely(c) Compress uniformly(d) Low density.
State whether the pressure of a gas in a sealed container increases or decreases with each of the following changes:(a) The volume changes from 250 mL to 500 mL.(b) The temperature changes from 20
Which of the following expresses standard atmospheric pressure?(a) 29.9 in. Hg(b) 76.0 cm Hg(c) 760 mm Hg(d) 14.7 psi(e) All of the above.
A sample of ethane gas has a volume of 125 mL at 20 °C and 725 torr. What is the volume of the gas at 20 °C when the pressure decreases to 475 torr?
When air in a steel cylinder is compressed from 10 L to 5 L, and temperature remains constant, the gas pressure inside the cylinder (increases/decreases).
Give the value for standard atmospheric pressure in each of the following units.(a) Millimeters of mercury(b) Pounds per square inch.
A 1.50-L sample of methane gas exerts a pressure of 1650 mm Hg. Calculate the final pressure if the volume changes to 7.00 L. Assume the temperature remains constant.
Which of the following changes increases the pressure of a gas? (a) Increasing the volume(b) Decreasing temperature(c) Increasing the number of molecules(d) All of the above(e) None of the
A krypton balloon has a volume of 555 mL at 21 °C. If the balloon is cooled and the volume decreases to 475 mL, what is the final temperature? Assume that the pressure remains constant.
When air in an elastic balloon cools from 25 °C to 20 °C, the volume of the balloon (increases/decreases).
Give the value for standard atmospheric pressure in each of the following units.(a) Centimeters of mercury(b) Inches of mercury.
A 275 L helium balloon is heated from 20 °C to 40 °C. Calculate the final volume assuming the pressure remains constant.
A volume of hydrogen gas at 1.00 atm decreases from 0.250 L to 0.125 L. If the temperature remains constant, what is the final pressure?(a) 0.250 atm(b) 0.500 atm(c) 1.00 atm(d) 2.00 atm(e) None
A copper container has a volume of 555 mL and is filled with air at 25 °C. The container is immersed in dry ice, and the pressure of the gas drops from 761 torr to 495 torr. What is the final
When air in a rigid steel tank cools from 25 °C to 20 °C, the pressure inside the tank (increases/decreases).
If oxygen gas in a steel container is at a pressure of 2.50 atm, what is the pressure expressed in each of the following units?(a) mm Hg(b) psi.
A steel container filled with nitrous oxide at 15.0 atm is cooled from 25 °C to -40 °C. Calculate the final pressure, assuming the volume remains constant.
A 1.00 L volume of oxygen gas is cooled from 50.0 °C to 25.0 °C. If the pressure remains constant, what is the final volume? (a) 0.500 L(b) 0.923 L(c) 1.00 L(d) 1.08 L(e) 2.00 L.
A sample of air is at an initial pressure of 1.00 atm. If both the volume and Kelvin temperature each double, what is the final pressure?

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