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    Regents Chemistry Test Preparation Practice

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    Formula Mass And Gram Formula Mass

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    Base your answers to questions 5 on the information below.

    Vitamin C, also known as ascorbic acid, is water soluble and cannot be produced by the human body. Each day, a person’s diet should include a source of vitamin C, such as orange juice. Ascorbic acid has a molecular formula of C6H8O6 and a gram-formula mass of 176 grams per mole.

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    Base your answers to questions 6 on the information below.

    The equation below represents the reaction between 1-butene and bromine to form the compound 1,2-dibromobutane, C4H8Br2.

    organic-chemistry, hydrocarbons, chemical-bonding, chemical-bonds, organic-chemistry, hydrocarbons fig: chem12013-exam_g17.png

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    Base your answers to questions 7 on the information below.

    The element boron, a trace element in Earth’s crust, is found in foods produced from plants. Boron has only two naturally occurring stable isotopes, boron-10 and boron-11.

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    Base your answers to questions 8 on the information below and on your knowledge of chemistry.

    Ethene and hydrogen can react at a faster rate in the presence of the catalyst platinum. The equation below represents a reaction between ethene and hydrogen.

    moles-and-stoichiometry, formula-mass-and-gram-formula-mass, moles-and-stoichiometry, compounds fig: chem12014-exam_g9.png

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    Base your answers to questions 9 on the information below and on your knowledge of chemistry.

    The balanced equation below represents the reaction of glucose, C6H12O6, with oxygen at 298 K and 101.3 kPa.

    C6H12O6(s) + 6O2(g) → 6CO2(g) + 6H2O(ℓ)

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    Base your answers to questions 10 on the information below and on your knowledge of chemistry.

    A student made a copper bracelet by hammering a small copper bar into the desired shape. The bracelet has a mass of 30.1 grams and was at a temperature of 21°C in the classroom. After the student wore the bracelet, the bracelet reached a temperature of 33°C. Later, the student removed the bracelet and placed it on a desk at home, where it cooled from 33°C to 19°C. The specific heat capacity of copper is 0.385 J/g•K.

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    Base your answers to questions 11 on the information below and on your knowledge of chemistry.

    A sample of calcium carbonate, CaCO3, has a mass of 42.2 grams. Calcium carbonate has a gram-formula mass of 100. g/mol.

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    Base your answers to questions 12 on the information below.

    The reaction between aluminum and an aqueous solution of copper(II) sulfate is represented by the unbalanced equation below.

    Al(s) + CuSO4(aq) → Al2(SO4)3(aq) + Cu(s)

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    Base your answers to questions 13 on the information below.

    A total of 1.4 moles of sodium nitrate is dissolved in enough water to make 2.0 liters of an aqueous solution. The gram-formula mass of sodium nitrate is 85 grams per mole.

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    Base your answers to questions 14 on the information below.

    A student constructs an electrochemical cell during a laboratory investigation. When the switch is closed, electrons flow through the external circuit. The diagram and equation below represent this cell and the reaction that occurs.

    oxidation-reduction, oxidation-reduction-(redox)-reaction, oxidation-reduction, electrochemical-cell, voltaic-cell fig: chem62012-exam_g23.png

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

    Paintball is a popular recreational activity that uses a metal tank of compressed carbon dioxide or nitrogen to launch small capsules of paint. A typical tank has a volume of 508 cubic centimeters. A 340.-gram sample of carbon dioxide is added to the tank before it is used for paintball. At 20.°C, this tank contains both CO2(g) and CO2(ℓ). After a paintball game, the tank contains only CO2(g).

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