June 2024 Chemistry Regents #16-20
Highlight to reveal answers and explanations
|
|
|||
|
Questions |
Answer | Links |
Explanations |
| 16. Which sample of matter is classified as a
mixture? 1 NaCl(s) 2 CH₃OH(ℓ) 3 SO₂(g) 4 KNO₃(aq) |
4 | aq--dissolved in water so it is a mixture | |
| 17. At STP, which property of tungsten
remains the same for all samples of tungsten? 1 Density 2 Mass 3 Surface area 4 Thermal energy |
1 | At the same temperature and pressure the density is constant. | |
| 18 An element is composed of atoms that must have: 1 The same atomic mass. 2 The same atomic number. 3 A different number of protons. 4 A different number of electrons. |
2 | Elements have atoms with the same number of protons...which is the atomic number. | |
|
|
|||
| 19 Compared to a 2.0 M aqueous solution of KI at 1.0
atm, water at 1.0 atm has a: 1 Lower boiling point and a lower freezing point. 2 Lower boiling point and a higher freezing point. 3 Higher boiling point and a lower freezing point. 4 Higher boiling point and a higher freezing point. |
3 | solutions have
Higher boiling point and a lower freezing point. |
|
| 20 Which statement describes the particles of an
ideal gas, based on the kinetic molecular theory? 1 The particles have attractive forces between them. 2 The particles move in random, constant, straight-line motion. 3 The particles collide, increasing the total energy of the system. 4 The particles are separated by distances that are small compared to their size. |
2 | Ideals gas rules The particles move in random, constant, straight-line motion. on every Regents |
|
|
|
|||
|
|
| Back to Regents Exams |