June 2018 Chemistry Regents #16-20
Highlight to reveal answers and explanations
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Questions | Answer | Links | Explanations |
| 16 Which phrase describes the motion and attractive forces of ideal gas particles? (1) random straight-line motion and no attractive forces (2) random straight-line motion and strong attractive forces (3) random curved-line motion and no attractive forces (4) random curved-line motion and strong attractive forces | 1 | link | continuous, random straight line motion |
| 17 At which temperature will Hg(ℓ) and Hg(s) reach equilibrium in a closed system at 1.0 atmosphere? (1) 234 K (3) 373 K (2) 273 K (4) 630. K | 1 | melting point on table S | |
| 18 A molecule of any organic compound has at least one (1) ionic bond (3) oxygen atom (2) double bond (4) carbon atom | 4 | organic...carbon containing | |
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| 19 A chemical reaction occurs when reactant particles (1) are separated by great distances (2) have no attractive forces between them (3) collide with proper energy and proper orientation (4) convert chemical energy into nuclear energy | 3 | link | When two chemicals react, their molecules have to collide with each other with sufficient energy and the correct orientation for the reaction to take place. This is collision theory. |
| 20 Systems in nature tend to undergo changes toward (1) lower energy and lower entropy (2) lower energy and higher entropy (3) higher energy and lower entropy (4) higher energy and higher entropy | 2 | link | nature higher entropy lower energy |
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