Chemistry Questions

Which polyatomic ion contains the greatest number of oxygen atoms?(1) acetate (3) hydroxide(2) carbonate (4) peroxide
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A sample of gas is held at constant pressure. Increasing the Kelvin temperature of this gas sample causes the average kinetic energy of its molecules to(1) decrease and the volume of the gas sample to decrease(2) decrease and the volume of the gas sample to increase(3) increase and the volume of the gas sample to decrease(4) increase and the volume of the gas sample to increase
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Which changes occur as a cadmium atom, Cd, becomes a cadmium ion, Cd2+?(1) The Cd atom gains two electrons and its radius decreases.(2) The Cd atom gains two electrons and its radius increases.(3) The Cd atom loses two electrons and its radius decreases.(4) The Cd atom loses two electrons and its radius increases.
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Given the balanced equation:2C + 3H2==> C2H6What is the total number of moles of C that must completely react to produce 2.0 moles of C2H6?(1) 1.0 mol (3) 3.0 mol(2) 2.0 mol (4) 4.0 mol
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Conductivity in a metal results from the metal atoms having(1) high electronegativity(2) high ionization energy(3) highly mobile protons in the nucleus(4) highly mobile electrons in the valence shell
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A sample of an element is malleable and can conduct electricity. This element could be(1) H (3) S(2) He (4) Sn
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The molecular formula of glucose is C6H12O6. What is the empirical formula of glucose?(1) CHO (3) C6H12O6(2) CH2O (4) C12H24O12
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Which electron configuration represents the electrons in an atom of chlorine in an excited state?(1) 2-7-7 (3) 2-8-7(2) 2-7-8 (4) 2-8-8
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A person with a body temperature of 37°C holds an ice cube with a temperature of 0°C in a room where the air temperature is 20.°C. The direction of heat flow is(1) from the person to the ice, only(2) from the person to the ice and air, and from the air to the ice(3) from the ice to the person, only(4) from the ice to the person and air, and from the air to the person
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A gas changes directly to a solid during(1) fusion (3) saponification(2) deposition (4) decomposition
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Which trends are observed as each of the elements within Group 15 on the Periodic Table is considered in order from top to bottom?(1) Their metallic properties decrease and their atomic radii decrease.(2) Their metallic properties decrease and their atomic radii increase.(3) Their metallic properties increase and their atomic radii decrease.(4) Their metallic properties increase and their atomic radii increase.
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Which metal is more active than H2?(1) Ag (3) Cu(2) Au (4) Pb
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According to Table F, which compound is soluble in water?(1) barium phosphate (3) silver iodide(2) calcium sulfate (4) sodium perchlorate
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The bonds in BaO are best described as(1) covalent, because valence electrons are shared(2) covalent, because valence electrons are transferred(3) ionic, because valence electrons are shared(4) ionic, because valence electrons are transferred
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Which substance has the lowest vapor pressure at 75°C?(1) water (3) propanone(2) ethanoic acid (4) ethanol
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A saturated solution of NaNO3 is prepared at 60.°C using 100. grams of water. As this solution is cooled to 10.°C, NaNO3 precipitates (settles)out of the solution. The resulting solution is saturated. Approximately how many grams of NaNO3 settled out of the original solution?(1) 46 g (3) 85 g(2) 61 g (4) 126 g
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Which list of the phases of H2O is arranged in order of increasing entropy?(1) ice, steam, and liquid water(2) ice, liquid water, and steam(3) steam, liquid water, and ice(4) steam, ice, and liquid water
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Given the balanced equation representing a phase change:C6H4Cl2(s) + energy==>C6H4Cl2(g)Which statement describes this change?(1) It is endothermic, and entropy decreases.(2) It is endothermic, and entropy increases.(3) It is exothermic, and entropy decreases.(4) It is exothermic, and entropy increases.
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