Weegy: Organic chemistry is the study of compounds containing carbon. User: In the chemical equation Zn + 2HCL ZnCl2 + H2, the reactants are A. zinc chlorate and water. B. zinc chloride and hydrogen. C. zinc and hydrochloric acid. D. zinc and hydrogen carbonate. (More)

Weegy: Paint exposed iron parts with protective paint is one way to prevent the corrosion of iron. User: When two atoms of different elements come in contact, heat is given off and light is produced. Which of the following does this support? A. The law of conservation of energy B. Dalton's atomic theory C. The law of conservation of matter D. The law of definite proportions Weegy: When two atoms of different elements come in contact, heat is given off and light is produced, The law of conservation of energy is supported. User: Which of the following classifications of matter includes materials that can no longer be identified by their individual properties? A. Mixture B. Element C. Compound D. Atom (More)

Weegy: Dmitri Mendeleev: first attempted to construct a periodic table based on an element's atomic mass. User: If you find that a substance turns litmus paper to blue and contains hydroxide ions, it is most likely A. water. B. a base. C. an acid. D. a salt. Weegy: If you find that a substance turns litmus paper to blue and contains hydroxide ions, it is most likely: a BASE. User: If you place a crystal substance on a tabletop, return to view it after some time passes, and find it as a powdered substance, which of the following processes most likely took effect? A. Deliquescence B. Distillation C. Crystallization D. Efflorescence Weegy: If you place a crystal substance on a tabletop, return to view it after some time passes, and find it as a powdered substance, Efflorescence most likely took effect. User: Which of the following medicinals are utilized to help reduce pain? A. Sulfonamides B. Insulin injectables C. Analgesics D. Tranquilizers Weegy: Analgesics are utilized to help reduce pain. User: Which of the following notations would be the appropriate and final way to display the formula for magnesium chloride? A. MgCl B. Mg+2Cl–1 C. MgCl2 D. MGCl2 Weegy: MgCl2 would be the appropriate and final way to display the formula for magnesium chloride. (More)

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Weegy: The work of Davisson and Germer helped to explain light's ability to propagate through a vacuum. User: When a beam of light passes at an oblique angle into a material of lower optical density, the angle of incidence is A. greater than the angle of refraction. B. less than the angle of reflection. C. greater than the angle of reflection. D. less than the angle of refraction. Weegy: When a beam of light passes at an oblique angle into a material of lower optical density, the angle of incidence is less than the angle of refraction. User: The term angle of deviation is used in reference to a/an A. polarizer. B. lens. C. prism. D. analyzer. Weegy: The term angle of deviation is used in reference to: a prism. User: A magnifying glass is an example of a _______ lens. A. plano-concave B. double-concave C. converging D. plano-convex Weegy: A magnifying glass is an example of a plano-convex lens. User: Which of the following lenses has at least one plane surface? A. Double-convex lens B. Plano-convex lens C. Converging concavo-convex lens D. Double-concave lens (More)