June 2019 Chemistry Regents #16-20
Highlight to reveal answers and explanations
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Questions | Answer | Links | Explanations |
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16 Which statement describes the particles of an ideal gas, based on the
kinetic molecular theory? (1) The volume of the particles is considered negligible. (2) The force of attraction between the particles is strong. (3) The particles are closely packed in a regular, repeating pattern. (4) The particles are separated by small distances, relative to their size.
| 1 |
The volume of the particles is considered negligible.
ideal gases have properties that do not allow them to liquefy...they are fake | |
| 17 During which two processes does the
structure of a substance release energy? (1) freezing and condensation (2) freezing and melting (3) evaporation and condensing (4) evaporation and melting
| 1 |
S....L....G...questions 1 <---, <---- releasing 2. <---, ----> 3. ----> , <--- 4. ---->, ----> absorbing | |
| 18 Base
of Table I, which compound dissolves in water by an exothermic process? (1) NaCl (2) NaOH (3) NH4Cl (4) NH4NO3
| 2 | exothermic is negative find NaOH with water over the arrow | |
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| 19. At STP, which property of a molecular
substance is determined by the arrangement of its molecules? (1) half-life (2) molar mass (3) physical state (4) percent composition
| 3 | arrangement determines phase...so 3 | |
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20. Equilibrium can be reached by (1) physical changes, only (2) nuclear changes, only (3) both physical changes and chemical changes (4) both nuclear changes and chemical changes
| 3 | both | |
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