Problems About Heat, Specific Heat and Changes in Temperature

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

• Q = m C ∆T

• 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 thermal energy?

• Large cup

• Small cup

• Medium Cup

• All three are the same temperature so they have same thermal energy

Tags

NGSS.HS-PS3-4

If the specific heat of water is 4.186 J/g∙°C, how much heat is required to increase the temperature of 1.2 g of water from 23 °C to 39 °C?

• -80.371.2 J

• 44.938.6 J

• 80.371.2 J

• 112.575.9 K

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-4

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

Tags

NGSS.MS-PS1-4

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

Tags

NGSS.HS-PS3-1

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

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

• (Q)(m) = (∆T)(C)

• ∆T = Q / (m)(C)

• ∆T = (Q)(m) / C

• ∆T = (m)(c)(Q)

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

What is the symbol for Thermal Energy?

• Q
• T
• m
• Cp

Tags

NGSS.HS-PS3-4

What unit do you use to measure Thermal Energy?

• J/Kg ºC
• Kg
• ºC
• J