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TRUE-FALSE QUESTIONS (2 points each) 22. Current chemical theory strongly suggests that all naturally occurring elements have been The most common (abundant) element in the universe is Common physical properties for a substance include color, melting point, boiling po 24. flammability and hardness. lonic bonds result from the sharing of one or more pairs of electrons. 26, The elements gold, silver and antimony all have chemical symbols which start with the 27 letter A Once a coordinate covalent bond is formed, there is no way to distinguish it from any other All naturally occurring atoms of an element must be identical to each other in terms of A polyatomic ion is a group of atoms that is held together by ionic bonds and has covalent bonds in a molecule. acquired a charge. Intermolecular forces are the basis for the solubility rule "like dissolves like". 31. 32. The major use for sulfuric acid is car batteries. Fat-soluble vitamins have polar molecular structures. Some hydroxide ion is present in all acidic solutions 34· 35. HCl is a strong acid. 36. A basis for distinguishing between an element and a compound is whether the substance can be decomposed into other substances using physical means.

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