Regents Chemistry Test Preparation Practice

    Regents Test, Full Exam Practice Online: chemistry June 2018

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    Base your answers to questions 31 and 32 on your knowledge of chemistry and the bright-line spectra produced by four elements and the spectrum of a mixture of elements represented in the diagram below.

    excited-states-bright-line-spectrum fig: chem62018-exam_g8.png

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

    Some compounds of silver are listed with their chemical formulas in the table below.

    bonding-tendency-of-elements fig: chem62018-exam_g21.png

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

    When a cobalt-59 atom is bombarded by a subatomic particle, a radioactive cobalt-60 atom is produced. After 21.084 years, 1.20 grams of an original sample of cobalt-60 produced remains unchanged.

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

    A sample of a molecular substance starting as a gas at 206°C and 1 atm is allowed to cool for 16 minutes. This process is represented by the cooling curve below.

    heating-curves-calculation-of-heat fig: chem62018-exam_g22.png

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

    The diagram below represents a cylinder with a moveable piston containing 16.0 g of O2(g). At 298 K and 0.500 atm, the O2(g) has a volume of 24.5 liters.

    percent-composition fig: chem62018-exam_g23.png

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

    In the late 1800s, Dmitri Mendeleev developed a periodic table of the elements known at that time. Based on the pattern in his periodic table, he was able to predict properties of some elements that had not yet been discovered. Information about two of these elements is shown in the table below.

    states-of-matter fig: chem62018-exam_g25.png

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

    Methanol can be manufactured by a reaction that is reversible. In the reaction, carbon monoxide gas and hydrogen gas react using a catalyst. The equation below represents this system at equilibrium.

    CO(g) + 2H2(g) ⇌ CH3OH(g) + energy

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    Base your answers to questions 74 through 76 on the information below and on your knowledge of chemistry.

    Fatty acids, a class of compounds found in living things, are organic acids with long hydrocarbon chains. Linoleic acid, an unsaturated fatty acid, is essential for human skin flexibility and smoothness. The formula below represents a molecule of linoleic acid.

    formulas fig: chem62018-exam_g26.png

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    Base your answers to questions 77 through 79 on the information below and on your knowledge of chemistry.

    Fuel cells are voltaic cells. In one type of fuel cell, oxygen gas, O2(g), reacts with hydrogen gas, H2(g), producing water vapor, H2O(g), and electrical energy. The unbalanced equation for this redox reaction is shown below.

    H2(g) + O2(g) → H2O(g) + energy

    A diagram of the fuel cell is shown below. During operation of the fuel cell, hydrogen gas is pumped into one compartment and oxygen gas is pumped into the other compartment. Each compartment has an inner wall that is a porous carbon electrode through which ions flow. Aqueous potassium hydroxide, KOH(aq), and the porous electrodes serve as the salt bridge.

    chemical-reactions-and-equations fig: chem62018-exam_g27.png

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

    In a laboratory investigation, a student compares the concentration and pH value of each of four different solutions of hydrochloric acid, HCl(aq), as shown in the table below.

    significent-figures-conversions fig: chem62018-exam_g29.png

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

    Carbon dioxide is slightly soluble in seawater. As carbon dioxide levels in the atmosphere increase, more CO2 dissolves in seawater, making the seawater more acidic because carbonic acid, H2CO3(aq), is formed.

    Seawater also contains aqueous calcium carbonate, CaCO3(aq), which is used by some marine organisms to make their hard exoskeletons. As the acidity of the sea water changes, the solubility of CaCO3 also changes, as shown in the graph below.

    solutions fig: chem62018-exam_g30.png

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