# A Unique Quiz On Thermochemistry

15 Questions | Total Attempts: 850  Settings  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!

• 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/gpC

• B.

3.7 J/gp

• C.

2300 J/gpC

• 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.

^H72.3 kJ

• C.

^H72.3 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

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