Regents Chemistry Test Preparation Practice

    Regents Test, Full Exam Practice Online: chemistry January 2020

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

    The four naturally occurring isotopes of sulfur are S-32, S-33, S-34, and S-36. The table below shows the atomic mass and percent natural abundance for these isotopes.

    identification-of-element fig: chem12020-exam_g9.png

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    Base your answers to questions 54 through 57 on the information below and on your knowledge of chemistry.

    During a laboratory activity, appropriate safety equipment is used and safety procedures are followed. A student separates a sample of rock salt that has two components; NaCl(s) and small insoluble rock particles. First, the student thoroughly stirs the sample of rock salt into a sample of water in a fl ask. The mixture in the fl ask is fi ltered using the lab apparatus shown below.

    separation-of-the-components-of-a-mixture fig: chem12020-exam_g11.png

    The water is evaporated from the beaker. The fi lter paper and its contents are dried. The data collected by the student are shown in the table below.

    separation-of-the-components-of-a-mixture fig: chem12020-exam_g10.png

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    Base your answers to questions 58 through 61 on the information below and on your knowledge of chemistry.

    Cylinder A and cylinder B are sealed, rigid cylinders with movable pistons. Each cylinder contains 500. milliliters of a gas sample at 101.3 kPa and 298 K. Cylinder A contains H2(g) and cylinder B contains N2(g). The diagrams below represent these two cylinders.

    gas-lows fig: chem12020-exam_g12.png

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    Base your answers to questions 62 and 63 on the information below and on your knowledge of chemistry.

    The electrical conductivity of three aqueous solutions was tested at room temperature. A 0.1 M HCl(aq) solution conducted, but a 6.0 M HCl(aq) solution was a better conductor. A 0.1 M C6H12O6(aq) solution was also tested. During this laboratory activity, appropriate safety equipment was used and safety procedures were followed.

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    Base your answers to questions 64 and 65 on the information below and on your knowledge of chemistry.

    Phosphorus-30 and phosphorus-32 are radioisotopes. Phosphorus-30 decays by positron emission.

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

    Sir William Ramsey is one scientist credited with identifying the noble gas argon. Sir Ramsey separated nitrogen gas from the air and reacted it with an excess of magnesium, producing solid magnesium nitride. However, a small sample of an unreactive gas remained with a density different from the density of the nitrogen gas. Sir Ramsey identifi ed the unreactive gas as argon and later went on to discover neon, krypton, and xenon.

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

    A sample of normal rainwater has a pH value of 5.6 due to dissolved carbon dioxide gas from the atmosphere. Acid rain is formed when other gases, such as sulfur dioxide, dissolve in rainwater, which can result in lake water with a pH value of 4.6. The equation below represents the reaction of water with SO2(g).

    acidity-ph-and-indicators fig: chem12020-exam_g13.png

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    Base your answers to questions 73 through 77 on the information below and on your knowledge of chemistry.

    A metal worker uses a cutting torch that operates by reacting acetylene gas, C2H2(g), with oxygen gas, O2(g), as shown in the unbalanced equation below.

    C2H2(g) + O2(g) → CO2(g) + H2O(g) + heat

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    Base your answers to questions 78 through 82 on the information below and on your knowledge of chemistry.

    Water, H2O, and hexane, C6H14, are commonly used as laboratory solvents because they have different physical properties and are able to dissolve different types of solutes. Some physical properties of water and hexane are listed on the table below.

    heat-and-temperature fig: chem12020-exam_g14.png

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

    In a laboratory investigation, a student constructs an electrochemical cell to decompose water, as represented in the diagram below. The water in the electrochemical cell contains a small amount of dissolved sodium sulfate, to increase conductivity. The three equations represent the reaction in each test tube and the overall reaction. During this laboratory activity, appropriate safety equipment is used and safety procedures are followed.

    oxidation-numbers-(states) fig: chem12020-exam_g15.png

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