template by becky afghani, 2007 jeopardy honors chemistry thermochemistry change in enthalpy,...

Template by Becky Afghani, 2007

Jeopardy

Honors Chemistry

ThermochemistryChange in Enthalpy, Calorimetry, Endothermic vs.

Exothermic, Calculations, and Definitions

GAME BOARDDIRECTIONS


Directions

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The Question Slides: Use the space bar or right arrow on the keyboard to see the answer. Click the Game Board button to return to the game board.

Start with the game board. When a student or team selects a category and a dollar amount, click it with the mouse. The question will appear. Use the right arrow or space bar on the keyboard to see the answer. Click the game board button to return to the game board. Repeat. Press the Esc button on the keyboard to stop playing.

Template by Becky Afghani, 2007DIRECTIONS TITLE PAGE

Change in Enthalpy

Calorimetry CalculationsEndo vs.

ExoDefinitions

$100 $100 $100$100 $100

$200 $200 $200$200 $200

$300 $300 $300$300 $300

$400 $400 $400$400 $400

$500 $500 $500$500 $500

Thermochemistry Jeopardy

Final Jeopardy


Change in Enthalpy$100

What must be held constant in a chemical reaction in order for the

change in enthalpy (∆H) to equal the amount of heat (q)

generated/released ?

Pressure.

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arrow on keyboard to

see answer.



Write a formation equation for glucose, C6H12O6(s). Be sure to

include the value of ∆Hf°

6 Cgraphite(s) + 6 H2(g) + 3 O2(g) C6H12O6(s)

∆Hf°= -1273.02 kJ/mol

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see answer.



Calculate the standard enthalpy change for the following reaction:

3 Fe2O3(s) + CO(g) 2 Fe3O4(s) + CO2(g)

∆Hrxn°= -50.72 kJ

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see answer.



Find ∆Hf° for C4H4S(l) using the information given below:

C4H4S(l) + 6 O2(g) 4 CO2(g) + SO2(g) + 2 H2O(l)

∆Hrxn° = -2523 kJ

∆Hf° for C4H4S(l) = +80.44 kJ/mol

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Given the following equations and ∆H values, determine the heat of the following reaction:

B2H6(g) + 6 Cl2(g) 2 BCl3(g) + 6 HCl(g) a. BCl3(g) + 3 H2O(l) H3BO3(g) + 3 HCl(g) ∆H= -112.5 kJ

b. B2H6(g) + 6 H2O(l) 2 H3BO3(g) + 6 H2(g) ∆H= -493.4 kJ

c. ½ H2(g) + ½ Cl2(g) HCl(g) ∆H= -92.3 kJ

∆Hrxn= -1376 kJ

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Calorimetry$100

What two conditions are needed in order for a reaction to be

considered standard?

298K/25ºC and atmospheric pressure

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Calorimetry$200

How much heat is needed to raise 14 g of a metal with a specific

heat of 0.105 J/g. C from 24.0 C ⁰ ⁰to 98.3 C?⁰

109.22 Joules

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Calorimetry$300

1219 joules of heat raise the temperature of 250 g of metal by 64 C. What is the specific heat ⁰

of the metal?

0.076 J/g.⁰CGAME BOARD



see answer.


Calorimetry$400

If a 28g sample of a metal is heated to 93 C and then dropped into 25g of ⁰water in a calorimeter, what is the

specific heat of the metal if the temperature of the water rose from

20.4 C to 23.9 C?⁰ ⁰

0.19J/g.⁰CGAME BOARD



see answer.


Calorimetry$500

175 g of aluminum at 98 C is dropped ⁰into an insulated cup that contains

50mL of cold water at 16 C. ⁰Determine the temperature of thermal

equilibrium if the specific heat of aluminum is 0.90J/gx C⁰

51.22⁰CGAME BOARD



see answer.


Endo vs. Exo$100

Is the following reaction endothermic or exothermic?

2NaHCO3 + 129kJ Na2CO3 + H2O + CO2

Endothermic

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Endo vs. Exo$200

Is the following reaction endothermic or exothermic?

Fe2O3 + 3CO 2Fe + 3CO2

∆H = -26.3kJ

ExothermicGAME BOARD



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Endo vs. Exo$300

A person performs a chemical reaction inside a zip-lock bag.

When the reaction is finished, the bag feels warm to the touch.

Exothermic

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Endo vs. Exo$400

In an exothermic reaction, is the enthalpy lower for the reactants

or the products?

Lower= Products

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Enthalpy$500

Draw an enthalpy diagram for the following reaction:

2 Al2O3(s) 4 Al(s) + 3 O2(g)

∆H = + 3352 kJ

Up-Hill Diagram

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Calculations$100

What is the SI Unit for heat and energy?

Joule

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Calculations$200

Percent Daily Values on Nutrition Fact labels are based on a 2,000 Calorie diet. What would this be

in joules?

8,368,000 or 8.368x106 joules

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Calculations$300

A given system does 37kJ of work upon its surroundings and then releases 61kJ of heat. Calculate

the internal energy, ∆E, of the system.

-98 kJGAME BOARD



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Calculations$400

2Na + Cl2 2NaCl ∆H= -190kJ

If 2.67 moles of sodium were used in this reaction, how much heat

(in kJ) would be produced?

-253.65 kJ

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Calculations$500

S + O2 SO2 ∆H= -297kJ

If 501.19 kJ were released in the above reaction, how many grams

of oxygen were used?

54 gGAME BOARD



see answer.


Definitions$100

The portion of the universe that we single out for study.

System

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Definitions$200

The energy that an object possesses by virtue of its

motion.

Kinetic Energy

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Definitions$300

The movement of an object against some force.

Work

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Definitions$400

The law which states that energy is conserved in any process.

First Law of Thermodynamics

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Definitions$500

The heat evolved in a given process can be expressed as the sum of the

heats of several processes that, when added, yield the process of

interest.

Hess’s Law

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Final JeopardyHow many kilojoules of heat are

given off when 0.28 moles of water is cooled from 75 C to ⁰

25 C?⁰

GAME BOARD



see answer.

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