Template by Bill Arcuri, WCSD Click Once to Begin JEOPARDY! Chemistry 7 Final Review By: Catherine...

Template byBill Arcuri, WCSD

Click Once to BeginJEOPARDY!Chemistry 7 Final Review

By:

Catherine Flanagan


JEOPARDY!

100 100 100 100 100 100

200 200 200 200 200 200

300 300 300 300 300 300

400 400 400 400 400 400

500 500 500 500 500 500

VocabularyEndothermic

and Exothermic

Calorimetryand Heat Capacity

Practice

Problems

Enthalpy And Hess’s

Law

Change in State


Define endothermic

Vocabulary: 100


A Chemical reaction during which energy is transferred from the surroundings to the

system


If the ΔH is negative is it an endothermic or exothermic process?

Vocabulary: 200


Exothermic


What does a calorie measure?

Vocabulary: 300


The amount of energy it takes a certain substance to

raise 1 gram of water 1 degree Celsius.


What the difference between a calorie and Calorie?

Vocabulary: 400


A Calorie is 1000 calories.


What is enthalpy of fusion?

Vocabulary: 500


The amount of heat required to melt 1g of a substance (Hfus).


If NH3NO3 is dissolved in water and the temperature decreases is the process

endothermic or exothermic?

Endothermic and Exothermic: 100


Endothermic


Give an example of an exothermic phase change



Making iceCondensing water


Give an example of an endothermic phase change



Boiling or melting water


If ΔH is negative the reaction is…



Exothermic


An ice pack would be a …….. reaction



Endothermic


Convert 452J to calories

Calorimetry and Heat Capacity: 100


108 calories


Convert 384 kJ to calories.



91866 calories


If a 10.0g solid is dissolved in a 25.3°C sample of water and the final temperature is 27.4°C What is the value of

ΔH?

(Cp=.874 J/g°C)



ΔH= 18.40 J


If 3.4 mol of Aluminum is dissolved in water and the temperature changes from

25°C to 318°K and the specific heat is .874J/g°C What

is the ΔH value?



ΔH= 1590.70 J


How many Calories in 4500 kJ?



94 Calories


Convert 14.7 Calories to Joules

Practice Problems: 100


61446 J


If 1520 J are added to 24.5g of water at 63.1°C

what will the final temperature be?



77.9°C


45.8g of an unknown substance at 85.4°C is placed

in 67.9g of water at 16.1°C, and the final temperature of the system is 22.7°C what is the specific heat capacity of

the substance?



Cp= .156 cal/g°C


If you dissolve 3g of an unknown substance and the temperature

changes 32°C and 56J are produced what is the specific heat?



.583J/g°C


Given the following information about water:

Enthalpy of fusion: 80.87 cal/gSpecific heat of ice: .51 cal/g°CSpecific heat of water: 1cal/g°C

Specific heat of steam: .48 cal/g°CEnthalpy of vaporization: 547.2cal/g

How many calories are needed to warm 53.7g of water at -36.7°C to

136°C?

Practice Problems: 500Daily Double!!!


35779.25 cal


Define enthalpy

Enthalpy and Hess’s Law: 100


Heat when pressure is held constant


What is the value for ΔH for the following reaction?

CS2(l) + 2 O2(g) → CO2(g) + 2 SO2(g)

Given:C(s) + O2(g) → CO2(g); ΔHf = -393.5 kJ/molS(s) + O2(g) → SO2(g); ΔHf = -296.8 kJ/mol

C(s) + 2 S(s) → CS2(l); ΔHf = 87.9 kJ/mol



-1075.0 kJ/mol.


If you want to warm 4.5g of water from 34.6°C to

62.1°C how many joules would you need to add to

the water? (Specific heat of water= 4.18)



517.3 J


What mass of antimony can you melt with 9451J if the heat of

fusion is 165J/g ?



57.30g


How many joules are needed to melt 89.3g of antimony if the heat

fusion is 165 J/g ?



14734.5 J


The change from liquid to solid is called what?

Changes In State: 100


Freezing


The change from solid to gas is called what?



SublimationHence Mrs. Yard

vaporizing students as the SUBLiMoMnAtEr…



Gas

Boiling

Solid

Time

MeltingTem

pera

ture

What phase belongs in the yellow box?


Liquid


What happens on a molecular level to the atoms

when they change from a liquid to a gas?



The molecules break away from each other and are no

longer a define volume.


Why must one add gas to car tires in the winter but

take gas out of car tires in the summer?



Because the gas molecules don’t move as

fast in the winter therefore the tires would be deflated, where as the summer the molecules are faster and your tires

will grow.


Final Jeopardy

What is Mrs. Yard’s dogs name and when was it born?


Click Once to Begin

Joule, April 18th

(4.18)

Template by Bill Arcuri, WCSD Click Once to Begin JEOPARDY! Chemistry 7 Final Review By: Catherine...

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