January 2015 Chemistry Regents #41-45
Highlight to reveal answers and explanations
| |||
Questions | Answer | Links | Explanations |
41 Which two compounds are electrolytes? (1) KOH and CH3COOH (2) KOH and C5H12 (3) CH3OH and CH3COOH (4) CH3OH and C5H12 | 1 | link | Acid, Base or soluble salt |
42 Which statement explains why a CO2 molecule is nonpolar? (1) Carbon and oxygen are both nonmetals. (2) Carbon and oxygen have different electronegativities. (3) The molecule has a symmetrical distribution of charge. (4) The molecule has an asymmetrical distribution of charge. | 3 | link | SNAP Symmetrical is nonpolar asym. is polar |
43 Which temperature change indicates an increase in the average kinetic energy of the molecules in a sample? (1) 15°C to 298 K (3) 305 K to 0°C (2) 37°C to 273 K (4) 355 K to 25°C | 1 | link | Avg. KE is temperature C=K + 273 |
| |||
44 Given the particle diagram: Which substance at STP can be represented by this particle diagram? (1) N2 (3) Mg (2) H2 (4) Kr | 3 | link | At STP the only solid is Mg. The others are gases. |
45 Which type of equilibrium exists in a sealed flask containing Br2(ℓ) and Br2(g) at 298 K and 1.0 atm? (1) static phase equilibrium (2) static solution equilibrium (3) dynamic phase equilibrium (4) dynamic solution equilibrium | 3 | link | liquid and gas are in a phase equilibrium |
|