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    Chemistry worksheet
    Topic: Arrhenius Acids And Bases

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    Arrhenius Acids And Bases
    1

    When dissolved in water, an Arrhenius base yields

    (1) hydrogen ions

    (2) hydronium ions

    (3) hydroxide ions

    (4) oxide ions

    2

    Which compounds are electrolytes?

    (1) C2H5OH and H2SO4

    (2) C2H5OH and CH4

    (3) KOH and H2SO4

    (4) KOH and CH4

    3

    Which compounds yield hydrogen ions as the only positive ions in an aqueous solution?

    (1) H2CO3 and HC2H3O2

    (2) H2CO3 and NaHCO3

    (3) NH3 and HC2H3O2

    (4) NH3 and NaHCO3

    4

    Which substance is an electrolyte?

    (1) C6H12O6(s)

    (2) C2H5OH(ℓ)

    (3) NaOH(s)

    (4) H2(g)

    5

    Which compound yields H+ ions as the only positive ions in an aqueous solution?

    (1) KOH

    (2) NaOH

    (3) CH3OH

    (4) CH3COOH

    6

    What can be explained by the Arrhenius theory?

    (1) the behavior of many acids and bases

    (2) the effect of stress on a phase equilibrium

    (3) the operation of an electrochemical cell

    (4) the spontaneous decay of some nuclei

    7

    Which two compounds are electrolytes?

    (1) KOH and CH3COOH

    (2) KOH and C5H12

    (3) CH3OH and CH3COOH

    (4) CH3OH and C5H12

    8

    Which type of substance yields hydrogen ions, H+, in an aqueous solution?

    (1) an Arrhenius acid

    (2) an Arrhenius base

    (3) a saturated hydrocarbon

    (4) an unsaturated hydrocarbon

    9

    The electrical conductivity of an aqueous solution depends on the concentration of which particles in the solution?

    (1) molecules

    (2) electrons

    (3) atoms

    (4) ions

    Base your answers to questions 10 on the information below.

    In a titration, a few drops of an indicator are added to a flask containing 35.0 milliliters of HNO3(aq) of unknown concentration. After 30.0 milliliters of 0.15 M NaOH(aq) solution is slowly added to the flask, the indicator changes color, showing the acid is neutralized.

    10

    The volume of the NaOH(aq) solution is expressed to what number of significant figures?

    Allow 1 credit for 3 or three.

    Base your answers to questions 11 on the information below.

    Ammonium chloride is dissolved in water to form a 0.10 M NH4Cl(aq) solution. This dissolving process is represented by the equation below.

    physical-behavior-of-matter, concentration-of-a-solution fig: chem12013-exam_g18.png

    11

    Explain, in terms of ions, why a 10.0-milliliter sample of 0.30 M NH4Cl(aq) is a better conductor of electricity than a 10.0-milliliter sample of the 0.10 M NH4Cl(aq).

    Allow 1 credit. Acceptable responses include, but are not limited to:

    • The 0.30 M NH4Cl(aq) sample has more mobile ions in solution.

    • The 0.10 M NH4Cl solution has a lower concentration of ions.

    Base your answers to questions 12 on the information below and on your knowledge of chemistry.

    A laboratory technician is given the table below and a sample of one of the three substances listed in the table. The technician makes an aqueous solution with a portion of the sample. When a conductivity tester is lowered into the solution, the lightbulb on the tester glows brightly. Another portion of the sample is placed in a heat-resistant container that is placed in an oven at 450.°C. The sample melts.

    chemical-bonding, differentiation-of-types-of-substances fig: chem12016-exam_g9.png

    12

    Explain, in terms of ions, why an aqueous solution of potassium chromate conducts an electric current.

    Allow 1 credit. Acceptable responses include, but are not limited to:

    • An aqueous solution of potassium chromate has mobile ions that conduct electricity.

    • The K2CrO4 dissociated into mobile ions.

    • Aqueous potassium chromate has charged particles that can move.

    • The K+(aq) and CrO42−(aq) move freely.

    Base your answers to questions 13 on the information below and on your knowledge of chemistry.

    Natural gas and coal are two fuels burned to produce energy. Natural gas consists of approximately 80% methane, 10% ethane, 4% propane, 2% butane, and other components.

    The burning of coal usually produces sulfur dioxide, SO2(g), and sulfur trioxide, SO3(g), which are major air pollutants. Both SO2(g) and SO3(g) react with water in the air to form acids.

    13

    Complete the equation below representing the reaction of sulfur trioxide with water to produce sulfuric acid, by writing the formula of the missing reactant and the formula of the missing product.

    acids-bases-and-salts, arrhenius-acids-and-bases, moles-and-stoichiometry, formulas, moles-and-stoichiometry, compounds, acids-bases-and-salts, arrhenius-acids-and-bases fig: chem12016-abkq78.png

    Allow 1 credit. The order of the elements in each compound may vary.

    • SO3(g) + H2O(ℓ) → H2SO4(aq)

    Base your answers to questions 14 on the information below and on your knowledge of chemistry.

    During a titration, 10.00 mL of acetic acid, HC2H3O2(aq), is completely neutralized by adding 12.50 mL of 0.64 M sodium hydroxide, NaOH(aq).

    14

    Identify the only positive ion in the HC2H3O2(aq).

    Allow 1 credit. Acceptable responses include, but are not limited to:

    • H+(aq)

    • H3O+

    • hydrogen ions

    • hydronium

    Base your answers to questions 15 on the information below and on your knowledge of chemistry.

    In a laboratory activity, a student titrates a 20.0-milliliter sample of HCl(aq) using 0.025 M NaOH(aq). In one of the titration trials, 17.6 milliliters of the base solution exactly neutralizes the acid sample.

    15

    Identify the positive ion in the sample of HCl(aq).

    Allow 1 credit. Acceptable responses include, but are not limited to:

    • hydronium ion

    • H3O+

    • hydronium

    • H+

    • hydrogen ion

    • H3O+(aq)

    • hydrogen

    • H+(aq)

    • proton