Calculating Heat Energy

Substance Y has a heat of fusion of 3.5 KJ/g. How much heat would a 30 gram sample of substance Y absorb to melt at its melting point?

• 105KJ

• 105J

• 10.5KJ

• 1.05KJ

Propane has a heat of vaporization of 356 Joules per gram. How much heat is needed to completely evaporate a 40g sample of propane at its boiling temperature of 230K?

• 297 Joules

• 14240 Joules

• 297 J/gx°C

• 14240 J/gx°C

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NGSS.HS-PS3-2

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A 0.3 g piece of copper is heated and fashioned into a bracelet. The amount of energy transferred by heat to the copper is 11700 J. If the specific heat of copper is 390 J/g ⁰C, what Is the change of the copper's temperature?

• 100 °C

• 77,571,000 Joules

• 100Joules

• 2^oC

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NGSS.HS-PS3-1

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When a  piece of aluminum foil is taken out of the oven and cools from 100° to 50°, What is the change in temperature?

• 50°
• 0°
• 100°
• 150°

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NGSS.MS-PS1-4

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

• c
• Q
• m
• t

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

• Q=mc∆t
• Q=mc
• Q= ½mv
• m=QC

Specific heat is....

• The measure of kinetic energy of an objects particles
• A measure of the energy needed to increase the average kinetic energy of the particles
• The heating caused by the motion of flluid due to temperature difference
• The transfer of energy by electromagnetic radiation

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For a skillet, used for cooking, do you want a high or low specific heat

• High, so that it will need more energy to heat up
• Low, so that it will change temperature quickly

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NGSS.HS-PS3-4

Which of the following is NOT true about heat? 

• Heat moves from hot to cold
• Heat is a form of energy
• Heat cannot be transferred
• Heat makes molecules speed up 

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NGSS.HS-PS3-4