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Which statement about subatomic particles is true? A. Protons, neutrons, and electrons all have about the same mass. B. Unlike protons or neutrons, electrons have no mass. C. Neutrons have no charge and no mass. D. An electron has far less mass than either a proton or neutron.
Weegy: D) An electron has far less mass than either a proton or neutron is a true statement about subatomic particles. (More)
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Asked 1/15/2013 9:58:45 PM
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Which of the following does NOT show the law of conservation of mass? A. 24 g of Mg burn in 32 g O2 to produce 56 g of MgO. B. 24 mL of Mg burn in 32 mL O2 to produce 56 mL of MgO. C. 2 atoms of Mg react with 1 molecule of O2 to produce 2 units of MgO. D. 1 atom of Mg reacts with 1 atom of O to produce a unit of MgO that contains 2 atoms.
Weegy: C doesn't. If you add them up 24g + 32g is 52g, 24mL + 32mL is 56mL, 1 atom + 1 atom is one unit containing 2 atoms, but 2 atoms plus 1 molecule is not 2 units of MgO.. (More)
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Asked 1/15/2013 10:42:21 PM
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An industrial process makes calcium oxide by decomposing calcium carbonate. Which of the following is NOT needed to calculate the mass of calcium oxide that can be produced from 4.7 kg of calcium carbonate? A. the balanced chemical equation B. molar masses of the reactants C. molar masses of the product D. the volume of the unknown mass
Weegy: An industrial process makes calcium oxide by decomposing calcium carbonate.NOT needed to calculate the mass of calcium oxide that can be produced from 4.7 kg of calcium carbonate.D. [ the volume of the unknown mass ] (More)
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Asked 1/15/2013 10:55:02 PM
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Reaction rates do NOT tell you how fast A. reactants are being consumed. B. products are being formed. C. substances are changing state. D. energy is being absorbed or released.
Weegy: Reaction rates do NOT tell you how fast D. energy is being absorbed or released. (More)
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Asked 1/15/2013 10:59:52 PM
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