January 2016 Chemistry Regents #11-15
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Questions | Answer | Links | Explanations |
11 Which compound contains both ionic and covalent bonds? (1) KI (3) CH2Br2 (2) CaCl2 (4) NaCN | 4 | ionic look for a metal and nonmetal covalent look for nonmetal and a nonmetal both look for a metal and 2 nonmetals | |
| 12 Given the balanced equation representing a reaction: H2 --> H + H What occurs during this reaction? (1) Energy is absorbed as bonds are formed. (2) Energy is absorbed as bonds are broken. (3) Energy is released as bonds are formed. (4) Energy is released as bonds are broken. | 2 | breaking bonds absorbs energy | |
| 13 Parts per million is used to express the (1) atomic mass of an element (2) concentration of a solution (3) volume of a substance (4) rate of heat transfer | 2 | Table D- concentration of a solution Units and what they are used for | |
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| 14 According to Table F, which ions combine with chloride ions to form an insoluble compound? (1) Fe2+ ions (3) Li+ ions (2) Ca2+ ions (4) Ag+ ions | 4 | look at the exceptions under Halides (Cl- is a halide...a halogen with a negative charge) | |
| 15 At 1 atm, equal masses of H2O(s), H2O(l), and H2O(g) have (1) the same density (2) the same distance between molecules (3) different volumes (4) different percent compositions | 3 | different volumes...test them in your head | |
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