Chemistry Questions

Which element is a liquid at STP?(1) argon (3) chlorine(2) bromine (4) sulfur
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Which characteristic is a property of molecular substances?(1) good heat conductivity(2) good electrical conductivity(3) low melting point(4) high melting point
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The elements in Period 5 on the Periodic Table are arranged from left to right in order of(1) decreasing atomic mass(2) decreasing atomic number(3) increasing atomic mass(4) increasing atomic number
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Which balanced equation represents a chemical change?(1) H2O(l) + energy → H2O(g)(2) 2H2O(l) + energy → 2H2(g) + O2(g)(3) H2O(l) → H2O(s) + energy(4) H2O(g) → H2O(l) + energy
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The solid and liquid phases of water can exist ina state of equilibrium at 1 atmosphere of pressureand a temperature of(1) 0°C (3) 273°C(2) 100°C (4) 373°C
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Given the balanced equation:I + I==> I2Which statement describes the process represented by this equation?(1) A bond is formed as energy is absorbed.(2) A bond is formed and energy is released.(3) A bond is broken as energy is absorbed.(4) A bond is broken and energy is released.
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Given the balanced equation representing a reaction:C3H8(g) + 5O2(g)==>3CO2(g) + 4H2O(g)What is the total number of moles of O2(g) required for the complete combustion of 1.5 moles of C3H8(g)?(1) 0.30 mol (3) 4.5 mol(2) 1.5 mol (4) 7.5 mol
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An example of a physical property of an element is the element’s ability to(1) react with an acid(2) react with oxygen(3) form a compound with chlorine(4) form an aqueous solution
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The balanced equation below represents a molecule of bromine separating into two bromine atoms.Br2-->Br + BrWhat occurs during this change?(1) Energy is absorbed and a bond is formed.(2) Energy is absorbed and a bond is broken.(3) Energy is released and a bond is formed.(4) Energy is released and a bond is broken.
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The gram formula mass of NH4Cl is(1) 22.4 g/mole (3) 53.5 g/mole(2) 28.0 g/mole (4) 95.5 g/mole
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The solubility of KClO3(s) in water increases as the(1) temperature of the solution increases(2) temperature of the solution decreases(3) pressure on the solution increases(4) pressure on the solution decreases
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A substance that does not conduct electricity as a solid but does conduct electricity when melted is most likely classified as(1) an ionic compound(2) a molecular compound(3) a metal(4) a nonmetal
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What is the chemical formula for iron(III) oxide?(1) FeO (3) Fe3O(2) Fe2O3 (4) Fe3O=
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When a neutral atom undergoes oxidation, the atom’s oxidation state(1) decreases as it gains electrons(2) decreases as it loses electrons(3) increases as it gains electrons(4) increases as it loses electrons
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In which compound is the percent by mass of oxygen greatest?A. BeOB. MgOC. CaOD. SrO
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Which statement describes the relative energy of the electrons in the shells of a calcium atom?(1) An electron in the first shell has more energy than an electron in the second shell.(2) An electron in the first shell has the same amount of energy as an electron in the second shell.(3) An electron in the third shell has more energy than an electron in the second shell.(4) An electron in the third shell has less energy than an electron in the second shell.
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Which pair of formulas represents two compounds that are electrolytes?(1) HCl and CH3OH(2) HCl and NaOH(3) C5H12 and CH3OH(4) C5H12 and NaOH
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The bond between Br atoms in a Br2 molecule is(1) ionic and is formed by the sharing of two valence electrons(2) ionic and is formed by the transfer of two valence electrons(3) covalent and is formed by the sharing of two valence electrons(4) covalent and is formed by the transfer of two valence electrons
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