Regents Chemistry Test Preparation Practice

    Regents Test, Full Exam Practice Online: chemistry August 2019

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    Base your answers to questions 51 through 53 on the information below and on your knowledge of chemistry.

    The only naturally occurring isotopes of nitrogen are N-14 and N-15.

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    Base your answers to questions 54 through 56 on the information below and on your knowledge of chemistry.

    The melting points and boiling points of fi ve substances at standard pressure are listed on the table below.

    states-of-matter fig: chem82019-exam_g10.png

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    Base your answers to questions 57 through 59 on the information below and on your knowledge of chemistry.

    A 100.-gram sample of liquid water is heated from 20.0°C to 50.0°C. Enough KClO3(s) is dissolved in the sample of water at 50.0°C to form a saturated solution.

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    Base your answers to questions 60 through 62 on the information below and on your knowledge of chemistry.

    The diagram and ionic equation below represent an operating voltaic cell.

    voltaic-cell fig: chem82019-exam_g11.png

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    Base your answers to questions 63 through 65 on the information below and on your knowledge of chemistry.

    A NaOH(aq) solution with a pH value of 13 is used to determine the molarity of a HCl(aq) solution. A 10.0-mL sample of the HCl(aq) is exactly neutralized by 16.0 mL of 0.100 M NaOH(aq). During this laboratory activity, appropriate safety equipment was used and safety procedures were followed.

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    Base your answers to questions 66 through 68 on the information below and on your knowledge of chemistry.

    A hydrate is a compound that has water molecules within its crystal structure. Magnesium sulfate heptahydrate, MgSO4•7H2O, is a hydrated form of magnesium sulfate. The hydrated compound has 7 moles of H2O for each mole of MgSO4. When 5.06 grams of MgSO4•7H2O are heated to at least 300.°C in a crucible by using a laboratory burner, the water molecules are released. The sample was heated repeatedly, until the remaining MgSO4 had a constant mass of 2.47 grams. During this laboratory activity, appropriate safety equipment was used and safety procedures were followed.

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    Base your answers to questions 69 through 71 on the information below and on your knowledge of chemistry.

    Solid sodium chloride, also known as table salt, can be obtained by the solar evaporation of seawater and from underground mining. Liquid sodium chloride can be decomposed by electrolysis to produce liquid sodium and chlorine gas, as represented by the equation below.

    2NaCl(ℓ) → 2Na(ℓ) + Cl2(g)

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

    The enclosed cabin of a submarine has a volume of 2.4 × 105 liters, a temperature of 312 K, and a pressure of 116 kPa. As people in the cabin breathe, carbon dioxide gas, CO2(g), can build up to unsafe levels. Air in the cabin becomes unsafe to breathe when the mass of CO2(g) in this cabin exceeds 2156 grams.

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    Base your answers to questions 76 through 78 on the information below and on your knowledge of chemistry.

    Automobile catalytic converters use a platinum catalyst to reduce air pollution by changing emissions such as carbon monoxide, CO(g), into carbon dioxide, CO2(g). The uncatalyzed reaction is represented by the balanced equation below.

    2CO(g) + O2(g) → 2CO2(g) + heat

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    Base your answers to questions 79 through 81 on the information below and on your knowledge of chemistry.

    The solvent 2-chloropropane can be made when chemists react propene with hydrogen chloride, as shown in the equation below.

    organic-compounds fig: chem82019-exam_g12.png

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    Base your answers to questions 82 through 85 on the information below and on your knowledge of chemistry.

    Radioactive emissions can be detected by a Geiger counter. When radioactive emissions enter the Geiger counter probe, which contains a noble gas such as argon or helium, some of the atoms are ionized. The ionized gas allows for a brief electric current. The current causes the speaker to make a clicking sound. To make sure that the Geiger counter is measuring radiation properly, the device is tested using the radioisotope Cs-137.

    To detect gamma radiation, an aluminum shield can be placed over the probe window, to keep alpha and beta radiation from entering the probe. A diagram that represents the Geiger counter is shown below.

    characteristic-trends fig: chem82019-exam_g13.png

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