ID: A e: ching 1/2 mark each for 7 marks Match the term with the correct definit
ID: 698869 • Letter: I
Question
ID: A e: ching 1/2 mark each for 7 marks Match the term with the correct definition below: a. thermochemistry f. open system c, specific heat capacity d. 1st law of thermodynamics e. calorie & temperature h. isolated system i. Hess's law j. state function 1. 2. the amount ofenergy needed to increase the temperat 3. a system that cannot exchange either energy or matter with the surroundings 4. a system that can exchange both matter and energy with the surroundings 5. a measure of the average kinetic energy of all the particles of a sample of matter the study of the energy changes involved in chemical and physical processes - ture of one gram of a substance by one degree Celsius 6. energy can be converted from one form to another but cannot be created or destroyed 7. the change in enthalpy when one mole of a compound is formed directly from its elements in their most stable state at standard ambient temperature and 8. quantity of heat needed to raise the temperature of Ig of pure water by 1'c 9 the enthalpy change of a physical or chemical process depends only on the initial and final conditions of the process property that depends only on the condition of the system at the moment, not how it got there. Match the term with the correct definition below: Classify each of the following reactions as exothermie or endothermic. Answer choices may be used more 10. than once. a. exothermic b. endothermic 11. Barium hydroxide crystals were mixed with ammonium chloride crystals at room temperature. The resulting 12. A piece of magnesium was added to a test tube of acid. After reacting for I min the outside of the test tube 13. Ammonium nitrate was added to a beaker of water. Drops of water on the outside of the beaker solidified into 14. Sodium hydroxide solution at 22 °C was mixed with hydrochloric acid solution at 24 °C. The final solution mixture had a temperature of 10 °C. was warm to the touch. ice. had a temperature of 29 °CExplanation / Answer
1. Thermochemistry is the study of heat changes involved in chemical and physical processes. Since heat is a form of energy, hence, (a) is the correct answer.
2. Specific heat capacity of a substance is defined as the amount of heat required to change (increase) the temperature of 1 g of the substance by 1°C; hence, (b).
3. A system that cannot exchange either heat or matter with the surroundings is left on its own. Hence, this system is an (h) isolated system.
4. A system that can exchange both energy and matter with the surroundings can interact with the surroundings in every possible way. Such a system is an (f) open system.
5. As per the kinetic theory of gases, temperature is a measure of the average kinetic energy of the particles in matter; hence, (g).
6. The 1st law of thermodynamics states that energy is conserved; hence, (d) is the definition.