Regents Chemistry Test Preparation Practice

    Regents Test, Full Exam Practice Online: chemistry June 2014

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    Base your answers to questions 55 and 56 on the information below and on your knowledge of chemistry.

    A 2.50-liter aqueous solution contains 1.25 moles of dissolved sodium chloride. The dissolving of NaCl(s) in water is represented by the equation below.

    concentration-of-a-solution fig: chem62014-exam_g9.png

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    Base your answers to questions 57 and 58 on the information below and on your knowledge of chemistry.

    A 1.00-mole sample of glucose, C6H12O6, completely reacts with oxygen, as represented by the balanced equation below.

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

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    Base your answers to questions 59 through 61 on the information below and on your knowledge of chemistry.

    Ethane, C2H6, has a boiling point of −89°C at standard pressure. Ethanol, C2H5OH, has a much higher boiling point than ethane at standard pressure. At STP, ethane is a gas and ethanol is a liquid.

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    Base your answers to questions 62 through 65 on the information below and on your knowledge of chemistry.

    An operating voltaic cell has zinc and iron electrodes. The cell and the unbalanced ionic equation representing the reaction that occurs in the cell are shown below.

    voltaic-cell fig: chem62014-exam_g10.png

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    Base your answers to questions 66 through 69 on the information below and on your knowledge of chemistry.

    A student compares some models of the atom. These models are listed in the table below in order of development from top to bottom.

    historic-models fig: chem62014-exam_g11.png

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    Base your answers to questions 70 through 72 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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    Base your answers to questions 73 through 75 on the information below and on your knowledge of chemistry.

    Many breads are made by adding yeast to dough, causing the dough to rise. Yeast is a type of microorganism that produces the catalyst zymase, which converts glucose, C6H12O6, to ethanol and carbon dioxide gas. The balanced equation for this reaction is shown below.

    functional-groups-and-types-of-organic-compounds fig: chem62014-exam_g12.png

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    Base your answers to questions 76 through 79 on the information below and on your knowledge of chemistry.

    During a laboratory activity, a student places 25.0 mL of HCl(aq) of unknown concentration into a flask. The student adds four drops of phenolphthalein to the solution in the flask. The solution is titrated with 0.150 M KOH(aq) until the solution appears faint pink. The volume of KOH(aq) added is 18.5 mL.

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    Base your answers to questions 80 through 82 on the information below and on your knowledge of chemistry.

    A few pieces of dry ice, CO2(s), at −78°C are placed in a flask that contains air at 21°C. The flask is sealed by placing an uninflated balloon over the mouth of the flask. As the balloon inflates, the dry ice disappears and no liquid is observed in the flask.

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    Base your answers to questions 83 through 85 on the information below and on your knowledge of chemistry.

    Illuminated EXIT signs are used in public buildings such as schools. If the word EXIT is green, the sign may contain the radioisotope tritium, hydrogen-3. The tritium is a gas sealed in glass tubes. The emissions from the decay of the tritium gas cause a coating on the inside of the tubes to glow.

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