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introductory chemistry concepts

Questions and Answers of Introductory Chemistry Concepts

Calculate the molar hydrogen ion concentration of each of the following given the pH.(a) Shampoo, pH 6(b) pH-balanced shampoo, pH 8.
Calculate the molar hydrogen ion concentration of each of the following given the pH.(a) Phosphate detergent, pH 9(b) Nonphosphate detergent, pH 11.
Calculate the pH of each of the following given the molar hydrogen ion concentration.(a) Milk, [H+] = 0.000 000 30 M(b) Eggs, [H+] = 0.000 000 016 M.
Calculate the pH of each of the following given the molar hydrogen ion concentration.(a) Carrots, [H+] = 0.000 007 9 M(b) Peas, [H+] = 0.000 000 39 M.
Calculate the molar hydrogen ion concentration of each of the following biological solutions given the pH.(a) Saliva, pH = 6.55(b) Blood, pH = 7.50.
Calculate the molar hydrogen ion concentration of each of the following biological solutions given the pH.(a) Gastric juice, pH = 1.80(b) Urine, pH = 4.75.
Calculate the pH of each of the following given the molar hydroxide ion concentration.(a) [OH–] = 0.11 M(b) [OH–] = 0.000 55 M.
Calculate the pH of each of the following given the molar hydroxide ion concentration.(a) [OH–] = 0.000 031 M(b) [OH–] = 0.000 000 000 66 M.
Calculate the molar hydroxide ion concentration of each of the following solutions given the pH.(a) pH = 4.55(b) pH = 5.20.
Calculate the molar hydroxide ion concentration of each of the following solutions given the pH.(a) pH = 0.90(b) pH = 1.62.
State whether each of the following substances in aqueous solution is highly ionized or slightly ionized.(a) Strong acids(b) Strong bases(c) Soluble ionic compounds.
State whether each of the following substances in aqueous solution is highly ionized or slightly ionized.(a) Weak acids(b) Weak bases(c) Slightly soluble ionic compounds.
Classify each of the following acids as a strong or weak electrolyte.(a) HF(aq)(b) HCl(aq)(c) HNO3(aq)(d) HNO2(aq).
Classify each of the following bases as a strong or weak electrolyte.(a) KOH(aq)(b) NH4OH(aq)(c) Sr(OH)2(aq)(d) Al(OH)3(s).
Classify each of the following aqueous solutions as a strong or weak electrolyte.(a) ZnCO3(s)(b) Sr(NO3)2(aq)(c) K2SO4(aq)(d) PbI2(s).
Classify each of the following aqueous solutions as a strong or weak electrolyte.(a) Fe(C2H3O2)3(aq)(b) AlPO4(s)(c) Ag2CrO4(s)(d) CdSO4(aq).
Write the following acids in either the ionized or the nonionized form to best represent an aqueous solution.(a) HF(aq)(b) HBr(aq)(c) HNO3(aq)(d) HNO2(aq).
Write the following bases in either the ionized or the nonionized form to best represent an aqueous solution.(a) NaOH(aq)(b) NH4OH(aq)(c) Ba(OH)2(aq)(d) Al(OH)3(s).
Write the following salts in either the ionized or the nonionized form to best represent an aqueous solution.(a) AgF(aq)(b) AgI(s)(c) Hg2Cl2(s)(d) NiCl2(aq).
Write the following salts in either the ionized or the nonionized form to best represent an aqueous solution.(a) AlPO4(s)(b) Co(C2H3O2)3(aq)(c) MnSO4(aq)(d) PbSO4(s).
Write a balanced net ionic equation for each of the following acid–base reactions. Refer to Table 14.5 and Appendix D for electrolyte information.(a) HCl(aq) + KOH(aq) → KCl(aq) +
List the four steps for writing a balanced net ionic equation.
Write a balanced net ionic equation for each of the following acid–base reactions. Refer to Table 14.5 and Appendix D for electrolyte information.(a) HF(aq) + Li2CO3(aq) → LiF(aq) + H2O(l) +
What term describes ions in a total ionic equation that do not react?
Write a balanced net ionic equation for each of the following solution reactions. Refer to Table 14.5 and Appendix D for electrolyte information.(a) AgNO3(aq) + KI(aq) → AgI(s) +
Write a balanced net ionic equation for each of the following solution reactions. Refer to Table 14.5 and Appendix D for electrolyte information.(a) Zn(NO3)2(aq) + NaOH(aq) → Zn(OH)2(s) +
A drop of methyl red and a drop of phenolphthalein are added to a beaker of distilled water. What is the resulting color of the water?
A drop of bromthymol blue and a drop of phenolphthalein are added to a beaker of distilled water. What is the resulting color of the water?
Methyl orange changes color from pH 3.2 to pH 4.4. If the indicator is red at pH 3 and yellow at pH 5, what is the color of the indicator in a pH 3.8 solution?
Bromcresol green changes color from pH 3.8 to pH 5.4. If the indicator is yellow at pH 3 and blue at pH 6, what is the color of the indicator in a pH 4.6 solution?
Identify the amphiprotic substance given the following reactions. HCl(aq) + NaH2PO4(aq) → H3PO4(aq) + NaCl(aq) NaOH(aq) + NaH2PO4(aq) → Na2HPO4(aq) + H2O(l)
Identify the amphiprotic substance given the following reactions. HI(aq) + K2HPO4(aq) → KH2PO4(aq) + KI(aq) KOH(aq) + K2HPO4(aq) → K3PO4(aq) + H2O(l)
What is the pH of a 0.50 M HCl solution?
What is the pH of a 0.50 M NaOH solution?
In 1 mL of water there are 3 x 1022 molecules of H2O. How many hydrogen ions are in 1 mL of water?
In 10 mL of water there are 3 x 1023 molecules of H2O. How many hydroxide ions are in 10 mL of water?
After reading a chemistry problem, what is always the first step?(a) Determine the relevant given value(b) Determine the unknown quantity(c) Write down unit factors(d) Estimate a "ballpark"
Given that 25.0 mL of 0.100 M aluminum bromide reacts with 0.125 M silver nitrate solution AlBr3(aq) + 3 AgNO3(aq) → 3 AgBr(s) + Al(NO3)3(aq)(a) What volume of AgNO3 is required for complete
What is first required before solving a stoichiometry problem?
State the problem-solving strategy described by each of the following.(a) What is the term for a drawing that shows the relationship between chemical concepts by connected boxes?(b) What is the
Given that 25.0 mL of 0.100 M lead(II) nitrate reacts with 37.5 mL of lithium iodide solution according to the equation Pb(NO3)2(aq) + 2 LiI(aq) → PbI2(s) + 2 LiNO3(aq)(a) What is the molarity of
What are the units of the unknown quantity for the following problem? Calculate the molar mass of oxygen gas given that 1.00 g of gas occupies 0.700 L at
A large quantity of sulfur is obtained industrially from “sour” natural gas containing hydrogen sulfide. First, hydrogen sulfide is burned in air to give sulfur dioxide. Second, the SO2 produced
If 2.00 L of hydrogen sulfide gas reacts with 2.00 L of oxygen gas at STP, which of the two gases is the limiting reactant?
Write the net ionic equation for the reaction of the weak electrolytes acetic acid and ammonium hydroxide.
Write the net ionic equation for the reaction of the strong electrolytes nitric acid and potassium hydroxide.
Alanine, abbreviated HAla, is an amino acid in protein. If 21.05 mL of 0.145 M NaOH neutralizes 0.272 g HAla, what is the molar mass of the amino acid?
Cream of tartar, abbreviated KHTart, is used in baking. If 42.10 mL of 0.100 M KOH neutralizes 0.791 g KHTart, what is the molar mass of cream of tartar?
Given 100.0 mL of 0.105 M aqueous carbon dioxide, calculate each of the following:(a) Mass of CO2 dissolved in the solution(b) Volume of CO2 gas (at STP) dissolved in the solution(c) Molecules of
What four quantities (e.g., mass) are related to the concept of a mole of gas?
State the problem-solving strategy described by each of the following.(a) What is the term for writing a series of steps that connects the unknown quantity to a given quantity using unit
Given 50.0 mL of 0.500 M hydrochloric acid, calculate each of the following:(a) Grams of HCl gas dissolved in the acid solution(b) Liters of HCl gas (at STP) dissolved in the solution(c) Molecules
Nitric acid is prepared industrially by the conversion of ammonia. There are three steps in the conversion, which is referred to as the Ostwald Process.What is the mass of HNO3 (63.02 g/mol)
State the basic metric system unit for each of the following physical quantities.(a) Length(b) Mass(c) Volume(d) Time(e) Temperature(f) Heat energy.
Which of the following units is an expression of gas pressure?(a) atm(b) kPa(c) mm Hg(d) psi(e) All of the above.
Calculate the mass of water in a 2.00-in. cube of ice. The density of ice is 0.917 g/cm3.
Which weighs more: a 1.00-cm cube of ice or 1.00 cm3 of water?
State the basic SI unit for each of the following physical quantities.(a) Length(b) Mass(c) Volume(d) Time(e) Temperature(f) Heat energy.
Lithium is the least dense metallic element. Its density is 0.534 g/mL. What is the mass of lithium in a 1.00-inch cube of the metal?
After organizing a solution to a chemistry calculation, what should be done before using a calculator?(a) Decide on a problem-solving strategy(b) Determine the unknown quantity(c) Estimate a
An automobile travels 375 miles, averaging 24.0 mi/gal. If 1.00 gallon of gasoline produces 8184 g of CO2, how many liters of carbon dioxide at STP are released during the trip?
Carbon dioxide is a “greenhouse” gas. What is meant by the term greenhouse gas and how does carbon dioxide contribute to global warming?
State the physical quantity corresponding to each of the following units.(a) cm(b) kg(c) cm3(d) s(e) °C(f) kcal.
An off-road vehicle using leaded gasoline travels 125 miles, averaging 10.5 miles per gallon. How many lead atoms are released to the environment if leaded gasoline contains 0.10 g Pb/gal. (In 1996,
If the unknown quantity is g/cm3 , what is true of the relevant given value?(a) The given value is a ratio of two units(b) The given value is expressed in metric units(c) The given value contains
The percentage composition of a gaseous fuel is 92.3% C and 7.7% H. If 1.33 g of the gas occupies a volume of 1.25 L at 20 °C and 750 mm Hg, what is the(a) Empirical formula and(b) Molecular
Rewrite the ideal gas law so that the molar mass (MM) of a gas is equal to the other variables in the ideal gas law equation.
State the physical quantity corresponding to each of the following units.(a) mm(b) ng(c) mm3(d) μs(e) K(f) kJ.
Cyclohexane is used as an organic solvent and fungicide. An elemental analysis of the compound showed its percent composition to be 85.7% C and 14.3% H. If the cyclohexane vapor in a 0.500-L flask
If 1.12 L of CO2 gas at STP is dissolved in 75.0 mL of aqueous solution, what is the number of carbon dioxide molecules dissolved in solution?(a) 2.39 x 1022 molecules(b) 3.01 x 1022
The reaction of calcium metal and water gives aqueous calcium hydroxide and hydrogen gas. If 1.05 g of calcium reacts completely and the hydrogen gas is collected over water at 759 mm Hg and 20 °C,
Is the volume of wet hydrogen gas collected greater or less than the same number of hydrogen molecules in dry hydrogen gas?
State the physical quantity corresponding to each of the following metric units.(a) m/s(b) g/mL(c) cal/(g x °C)(d) g solute/100 g solution.
If a sample of methane gas, CH4, reacts completely with oxygen gas to give 1.75 g of water, what STP volume of methane reacted?(a) 0.352 L(b) 0.703 L(c) 1.09 L(d) 2.18 L(e) 4.35 L. CH4(g) +
Phosphine, PH3, has a foul odor and irritates the respiratory system. The reaction of calcium phosphide and water gives phosphine gas and aqueous calcium hydroxide. Ca3P2(s) + H2O(l) → PH3(g) +
If 50.0 mL of 0.100 M sodium chloride solution are mixed with 100.0 mL of 0.150 M calcium chloride, what is the resulting molar concentration of the chloride ion? (Assume the solution volumes are
If 1 mole each of NaCl, KCl, and AgCl are added into separate 1-L beakers of water, which of the solutions contains the least number of chloride ions?
State the physical quantity corresponding to each of the following metric units.(a) km/h(b) kg/m3(c) J/(kg x K)(d) mol solute/1 L solution.
If 25.0 mL of 0.500 M potassium nitrate solution are mixed with 75.0 mL of 0.125 M aluminum nitrate, what is the resulting molar concentration of the nitrate ion? (You can assume that the solution
Given the three-step “blast furnace” process that converts iron ore, Fe2O3, into molten “pig iron":What mass of Fe2O3 produces 1.00 metric ton (1000 kg) of iron? (a) 175 kg(b) 699
If a drain cleaner solution is a strong electrolyte, which of the following must be true?(a) Drain cleaner is highly reactive.(b) Drain cleaner is slightly reactive.(c) Drain cleaner is highly
A nitrogen molecule can form a coordinate covalent bond with an oxygen atom to give nitrous oxide, N2O. Draw the electron dot formula for a nitrogen molecule and attach an oxygen atom.
What is the molar concentration of a saturated solution of calcium hydroxide that contains 0.185 g of solute in 100.0 mL of solution?
What is the molar concentration of a saturated solution of calcium sulfate that contains 0.209 g of solute in 100.0 mL of solution?
Which of the following has the highest acidity: pH 1, pH 5, or pH 9?
Which of the following is a general property of an acidic solution?(a) Tastes sour(b) Turns litmus paper red(c) pH greater than 7(d) Feels slippery.
Which of the following is a general property of an acidic solution?(a) Tastes sour(b) Turns litmus paper red(c) pH less than 7(d) Neutralizes bases(e) All of the above.
Indicate whether each of the following solutions is considered strongly acidic, weakly acidic, neutral, weakly basic, or strongly basic:(a) Stomach acid, pH 1.5(b) Oven cleaner, pH 13.5(c) Orange
Indicate whether each of the following properties corresponds to an acid or to a base:(a) Sour taste(b) Slippery feel(c) Turns litmus paper red(d) pH greater than 7.
Which of the following is a strong Arrhenius acid: HNO3(aq), H2CO3(aq), or H3PO4(aq)?
Which of the following is a general property of a basic solution?(a) Tastes bitter(b) Turns litmus paper blue(c) pH less than 7(d) Neutralizes a base.
Which of the following is a strong Arrhenius acid?(a) HCl(aq) (∽100% ionized)(b) HNO3(aq) (∽100% ionized)(c) H2SO4(aq) (∽100% ionized)(d) All of the above(e) None of the above.
Classify each of the following solutions as a strong or a weak Arrhenius acid given the degree of ionization:(a) perchloric acid, HClO4(aq) ∽100%(b) hypochlorous acid, HClO(aq)
Classify each of the following solutions as a strong or a weak Arrhenius base given the degree of dissociation:(a) Magnesium hydroxide, Mg(OH)2(aq) ∼1%(b) Strontium hydroxide, Sr(OH)2(aq)
Which acid and base undergo neutralization to give sodium acetate, NaC2H3O2?
Classify the following aqueous solutions as strongly acidic, weakly acidic, neutral, weakly basic, or strongly basic.(a) Stomach acid, pH 1.5(b) Vinegar, pH 3.2(c) Distilled water, pH
In the following reaction, which reactant is a Brønsted– Lowry base?HCl(aq) + KHS(aq) → KCl(aq) + H2S(aq)(a) HCl(b) KHS(c) KCl(d) H2S(e) None of the above.
Determine the acid and base that produce each of the following salts. Write a balanced equation for the neutralization reaction:(a) Lithium fluoride, LiF(aq)(b) Calcium sulfate, CaSO4(aq).
Determine the acid and base that produce each of the following salts. Write a balanced equation for the neutralization reaction.(a) Potassium iodide, KI(aq)(b) Barium nitrate, Ba(NO3)2(aq).
Which common acid–base indicator is colorless in acidic and neutral solutions?

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