Specific Heat

What is the equation to measure change in Thermal Energy?

• Q=mc∆t
• Q=mc
• Q= ∆mct
• m=QC

Copper, Stainless Steel, Carbon Steel, and Zinc were all heated using the same thermal energy.  What material would be the coolest after being heated?

• Copper
• Carbon Steel
• Zinc
• Stainless Steel

A material was cooled from 100ºC to 40ºC.  What is the temperature change?

• 60ºC
• 40ºC
• -60ºC
• -40ºC

The unit for heat energy is

• J

• J/gC

• g

When is your answer negative?

• When the sample is cooled or loses heat energy.

• When the sample heats up or gains heat energy.

• When the sample absorbs heat energy.

A high specific heat means...

• it requires more energy to change temperature

• it requires less energy to change temperature

How does heat flow?

• Always from cold to warm
• Always from warm to cold
• Both warm to cold & cold to warm
• It depends on the temperature

20 g of water. specific heat of water is 4.18 J/g°C.  temperature changes from 25° C to 20° C, how much heat energy (Q) moves from the water to the surroundings?

The specific heat(c) of copper is 0.39 J/g °C. What is the temperature change(∆t) when 100 Joules of heat(Q) is added to 20 grams of copper?

• 12.82 °C
• 24.12°C
• 351 °C

What is the change in temperature when 50,000 Joules of energy is added to 200 grams of water at 25 C?

• 0.016 C
• 1,500 C
• 63 C
• 0.4 C