June 2018 Chemistry Regents #11-15
Highlight to reveal answers and explanations
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Questions | Answer | Links | Explanations |
| 11 Based on Table S, which group on the Periodic Table has the element with the highest electronegativity? (1) Group 1 (3) Group 17 (2) Group 2 (4) Group 18 | 3 | cross reference the periodic table and table S | |
| 12 What is represented by the chemical formula PbCl2(s)? (1) a substance (2) a solution (3) a homogeneous mixture (4) a heterogeneous mixture | 1 | the (S) is solid..it is a pure substance | |
| 13 What is the vapor pressure of propanone at 50.°C? (1) 37 kPa (3) 83 kPa (2) 50. kPa (4) 101 kPa | 3 | know to use Table H | |
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| 14 Which statement describes the charge distribution and the polarity of a CH4 molecule? (1) The charge distribution is symmetrical and the molecule is nonpolar. (2) The charge distribution is asymmetrical and the molecule is nonpolar. (3) The charge distribution is symmetrical and the molecule is polar. (4) The charge distribution is asymmetrical and the molecule is polar. | 1 | SNAP... symmetrical is nonpolar draw it
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| 15 In a laboratory investigation, a student separates colored compounds obtained from a mixture of crushed spinach leaves and water by using paper chromatography. The colored compounds separate because of differences in (1) molecular polarity (2) malleability (3) boiling point (4) electrical conductivity | 1 | chromatography...polarity | |
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