Chem 2 - Heat Transfer (Specific Heat) Calculations

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 (thermal energy)?

• Largest cup (Trenta)

• Small cup (Tall)

• Large cup (Venti)

• All three have same amount of heat (thermal energy) because they are the same temperature

What would be the effect on the particles if more heat is supplied to the system? (CHECK ALLTHAT APPLY)

• They would slow down

• They would collide with each other more

• They would speed up

• There would be no effect

Tags

NGSS.HS-PS1-5

NGSS.HS-PS3-4

You should use scratch paper and a calculator

If you add 50 J of energy to a piece of iron, and the temperature rises (changes) by 25.0°C, what is the mass of the iron? (Iron has a specific heat of 0.10 J/g°C)

• 25 g

• 30 g

• 20 g

• 50 g

Tags

NGSS.HS-PS3-1

What unit is used to measure Thermal Energy?

• J/g ºC

• g

• ºC

• J

In the following equation, the symbol for specific heat is .......

 $Q\ =\ mc\Delta T$  

• c

• Q

• m

•  $\Delta T$  

How does heat flow, or get transferred?

(CHECK ALL STATEMENTS THAT ARE CORRECT)

• Always from the colder object to the warmer object

• Always from warmer object to the colder object

• From the particles with more kinetic energy to the ones with less kinetic energy

• From the particles with less kinetic energy to the ones with more kinetic energy

Tags

NGSS.HS-PS3-4

A high specific heat means...

• a substance requires less energy for its temperature to change

• a substance requires more energy for its temperature to change

• a substance heats up very quickly

• the substance's particles have a high average kinetic energy

You should use scratch paper and a calculator

The temperature of 20 grams of water changes from 25° C to 20° C. How much heat energy moved from the water to the surroundings? (The specific heat of water is 4.18 J/g°C)

• 418 J

• 209 J

• 83 J

• 4.18 J

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-4

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

• 60ºC

• 40ºC

• -60ºC

• -40ºC

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

The unit for temperature is

• K or $\degree C$

• J or cal

•  $\frac{J}{g\degree C}\ or\ \frac{cal}{g\degree C}$   

• g or kg