Unit 10 - Thermodynamics

What  is the formula to calculate heat energy required to raise the temperature of any substance?

• Q = m Cp ∆T
• Q = m Cp
• Q =  ½ m v
• m = Q Cp

If the specific heat of water is 4,186 J/kg∙°C, how much heat is required to increase the temperature of 1.2 kg of water from 23 °C to 39 °C? 

• -80,371.2 J
• 44,938.6 J
• 80,371.2 J
• 112,575.9 K

What would be the effect on the particles if more heat is supplied to the system?

• They would slow down
• They would stop moving
• They would speed up
• There would be no effect

A sample of iron receives 50.J of heat energy that raises the temperature of the iron 25.0°C. If iron has a specific heat of  0.10 J/g°C, what is the mass of the iron sample?

• 25 g
• 30 g
• 20 g
• 50 g

The specific heat is the amount of energy needed to raise the temperature one degree Celsius of 1 gram of a substance.

• True
• False

What is the symbol for Thermal Energy?

• Q
• T
• m
• Cp

What unit do you use to measure Thermal Energy?

• J/Kg ºC
• Kg
• ºC
• J

The symbol for specific heat is .......

• Cp
• Q
• m
• T

A high specific heat means...

• It heats up quickly with energy added
• It requires more energy to change temperature

ΔH value in an endothermic reaction is a positive number.

• True
• False