University:
North Central College
Course:
CHEM 121 | General Chemistry I
Academic year:

2019
Views:

389

Pages:

15
Author:

5CelestialChronicle

Heat and Tumperature DIRECTIONS: Write on the line at the right of each statement the number that makes the statement an equality when substituted for the corresponding number. 1. 30'C = _!!LK 1 2. -25'C = _LK 2 3. 190K = _@_ 'C 3 4. 300K = _ffi_ 'C 4 5. 6500 ea! = _@_ kJ 5 6. 1.62 kJ = ___@_kcal 6 DIRECTIONS: Write on the line at the right of each statement the letter preceding the word or expression that best completes the statement 7. Determining whether an object feels hot or cold to the touch is a way of measuring its (a) temperature; (b) heat; (c) densicy; (d) none of the above. ---,,· 7 8. The measurement using a thermometer is based on the (a) eype of thermometer liquid; (b) quantity of thermometer liquid; (c) uniform expansion or contraction of the thermometer liquid; (d) thermometer liquid's color. 8 9. Water freezes at (a) 273.15K; (b) IOO'C; (c) OK; (d) 373.15K. 9 10. The equation used to convert from the Celsius to Kelvin scale is (a) T(K) = t( C) + 100; (b) T(K) = t(°C) + 273.15; (c) T(C) = t(K) + 100; (d) 7'(0C) = l(K) + 273.15. ___ 10 11. If two systems do not have heat !lowing between them, they have the same (a) density; (b) thermodynamic properties; (c) specific heat; (d) temperature. ___ n 12. One calorie is the same amount of heat as 4.184 (a) joules; (b) Calories; (c) kilojoules; (d) kilocalories. ___ 12 ° DIRECflONS: Write the answer to questions 13-15 on the line to the right, and show your work in the space provided. 13. ·'A4.0-g sample of iron was heated from o.o•c to 20. •c, and was fuund to have absorbed 35.2 J of heat. Calculate the specific heat of this piece of iron. ____ 13 14. Calculate how much heat a copper sample will gain if its specific heat is 0.384 J/(g• C0 ), its mass is s.oo g, and it is heated from 10.o·c to 40.o•c. ____ 14 15. Determine the specific heat of a material if a 6 g sample absorbs 50 J as it is heated from 30 °Cto50 °C. ____ 15