Heat Energy Review

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

• Q = m (∆T) Cp

• Q = m Cp

• Q =  ½ m v

• m = Q Cp

There are four cups of hot cocoa. The cup sizes are shown. The temperature of the cocoa in each cup is 25 degrees celsius. Which cup has the MOST heat energy?

• Trenta

• Tall

• Venti

• All four are the same temperature so they have same heat energy

• Grande

Tags

NGSS.HS-PS3-4

If the specific heat of water is 4.18 J/g∙°C, how much heat is required to increase the temperature of 1.2 g of water from 23 °C to 39 °C? 

• -80.256 J

• 44.938 J

• 80.256 J

• 112.575 K

Tags

NGSS.HS-PS3-1

What would be the effect on the molecules 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

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NGSS.HS-PS1-5

A sample of iron receives 50. J of heat energy that raises the temperature of the iron from 20.0 °C to 45.0 °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

Tags

NGSS.HS-PS3-4

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

• True
• False

Tags

NGSS.HS-PS3-4

Using the heat equation, what would the formula look like if we were solving for change in temperature?

• Q m = ∆T Cp

• Q / (m Cp)  =  ∆T

• Q m / Cp  =  ∆T

• m c Q  =  ∆T

Tags

NGSS.HS-PS3-4

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?

• 12.82 °C

• 24.12°C

• 351 °C

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-4

What is the symbol for Heat Energy?

• Q

• T

• m

• Cp

What unit do you use to measure Heat Energy?

• J/g ºC

• g

• ºC

• J