Heat

Question 1

Which processes could the heating curve be describing? Check all that apply.

Revolt · Accepted Answer

B: condensation; D: exothermic reaction; E: freezing

Question 2

Use the table on the right to calculate each required quantity. Remember: The quantity of heat required to melt 175 g Cu is kJ. The substance that releases 21.2 kJ of energy when 1.42 mol of it freezes is .

Revolt · Accepted Answer

Part 1: 35.8; The substance that releases 21.2 kJ of energy when 1.42 mol of it freezes is: Fe

Question 3

The heat of vaporization for water is 40.7 kJ/mol. How much heat energy must 150.0 g of water absorb to boil away completely? Use the formula .

Revolt · Accepted Answer

A: 339.2 kJ

Question 4

A sample of water has a mass of 100.0 g. Calculate the amount of heat required to change the sample from ice at -45.0°C to liquid water at 75.0°C. Use the chart to complete the multiple steps required to arive at the final answer. Type in your answers below using 3 digits.q1 = kJ q2 = kJ q3 = kJ qtot = kJ

Revolt · Accepted Answer

1 =: 9.42; q2 =: 226; q3 =: 31.4; qtot =: 267

Question 5

The substance that releases 21.2 kJ of energy when 1.42 mol of it freezes is .

Revolt · Accepted Answer

PENDING

Question 6

q2 = kJ

Revolt · Accepted Answer

PENDING

Question 7

q3 = kJ

Revolt · Accepted Answer

PENDING

Question 8

qtot = kJ

Revolt · Accepted Answer

PENDING

Heat Answers

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