A Unique Quiz On Thermochemistry
15 Questions
| Total Attempts: 850
Thermochemistry is the scientific study of the heat energy that is involved in or produced by chemical reactions and/or physical transformations. What can you tell us about how this topic is studied and what its uses are? Take the quiz and we’ll find out together!
Questions and Answers
- 1.The SI unit of energy is
- A.
Heat capacity.
- B.
Calorie.
- C.
Joule.
- D.
Enthalpy.
- 2.How many calories are required to raise the temperature of 75.0 g of water from 20C to 50C?
- A.
2250 cal
- B.
3750 cal
- C.
75.0 cal
- 3.If 1 Calorie 4.18 kJ, how many kJ of energy can be released by an apple containing 125 Cal?
- A.
522 kJ
- B.
29.9 kJ
- C.
5.22 105 kJ
- 4.The temperature of a 6.0-g sample of glass changed from 20C to 45C when it absorbed 550 J of heat. What is the specific heat of this glass sample?
- A.
C0.27 J/gpC
- B.
3.7 J/gp
- C.
2300 J/gpC
- 5.The enthalpy of a system is the same as its:
- A.
Specific heat.
- B.
Heat of combustion.
- C.
Heat content.
- 6.When your body is warmed by an electric blanket during the winter, this process is said to be
- A.
Endothermic.
- B.
Exothermic.
- C.
Isothermic.
- 7.A student mixes two water solutions with an initial temperature of 25.0C to form a final solution with a mass of 65.0 g at 30.0C. What is the heat change, in kJ, for this reaction?
- A.
325 kJ
- B.
272 kJ
- C.
1.36 kJ
- 8.Given the equation 2Mg(s) O2(g) y2MgO(s) 72.3 kJ, which of the following is true?
- A.
The reaction is endothermic.
- B.
^H72.3 kJ
- C.
^H72.3 kJ
- 9.Given the equation in question 18, how much heat is involved in the production of 5.0 mol of MgO?
- A.
72 kJ
- B.
360 kJ
- C.
180 kJ
- 10.Given the equation Si(s) + 2Cl2(g) ------>SiCl2(g) ------>SiCl2(l) + 687 kJ, how much heat is produced when 106 g of Cl2 react?
- A.
513 kJ
- B.
360 kJ
- C.
180 kJ
- 11.Which of the following statements is true?
- A.
^Hfus^Hsolid
- B.
^Hfus^Hsolid
- C.
^Hsolid is always positive.
- 12.How much heat, in kJ, is required to melt 54.0 g of ice at 0C into water at 0C if ^Hfus for water = 6.01 kJ/mol?
- A.
0.111 kJ
- B.
325 kJ
- C.
18.0 kJ
- 13.How much heat is required to convert 9.00 g of water at 100C into steam at 100C, if ^Hvap for water = 40.7 kJ/mol?
- A.
20.4 kJ
- B.
366 kJ
- C.
18.0 kJ
- 14.If the molar heat of solution of NH4NO3 is 25.7 kJ/mol, how much heat (in kJ) would be required to dissolve 20.0 g of NH4NO3 in water?
- A.
0.250 kJ
- B.
514 kJ
- C.
6.43 kJ
- 15.Calculate the enthalpy change, H in kJ, for the reaction H2O(s) ---->H2(g) + 1/2O2(g) Use the following: H2(g) + 12O2(g) ---->H2O(l) ^H= 285.9 kJ H2O(s) yH2O(l) H+6.0 kJ
- A.
291.9 kJ
- B.
+291.9 kJ
- C.
279.9 k
Questions: 16 | Attempts: 3102 | Last updated: Mar 22, 2022
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Sample QuestionWhat do we call the heat content of a system
This quiz covers the terms endothermic, exothermic, Law of Conservation of Energy, heat of fusion, and heat of vaporization. It also contains a specific heat problem and a temperature conversion for degrees Celsius to Kelvin.
Questions: 5 | Attempts: 649 | Last updated: Mar 22, 2022
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Sample QuestionIf a reaction releases heat (energy), it is referred to as
Questions: 10 | Attempts: 499 | Last updated: Mar 21, 2022
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Sample QuestionUnder the proper conditions, when nitric oxide is allowed to react with chlorine and hydrogen peroxide, hydrogen nitrate and hydrogen chloride are produced as follows: NO(g) + 1/2Cl2(g) + H2O2(g) --> HNO3(g) + HCl(g) Calculate the enthalpy change in kJ for this reaction given the information below: NOCl(g) --> NO(g) + 1/2 Cl2 DH° = 37.0 kJ NOCl(g) + H2O2(g) --> HNO3(g) + HCl(g) DH° = -143.0 kJ
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