Specific heat capacity Flashcards

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1
Q

Define SHC

A

amount of energy required to raise the temperature of 1 kg of a substance by 1 degree celsius

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2
Q

What is the formula for SHC ?

A

change in thermal energy = mass * shc * temp change

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3
Q

What is the SHC of water ?

A

4200 J Kg/C

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4
Q

What are the units for mass, temp change, thermal energy and SHC ?

A

mass = kg
temp change = C
thermal energy = J
SHC = J / Kg C

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5
Q

SHC practical

A
  • place beaker on mass balance, set to 0
  • add liquid to beaker, record mass
  • place thermometer and immersion heater in liquid
  • record start temp of liquid
  • wrap insulating foam around beaker
  • connect joulemeter to heater
  • leave for 30 min, record number of Joules that passed into heater
  • record final temp, calculate SHC
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6
Q

How hot does a 3.5 kg brick get if it’s heated from 20°C by 20,000 J (20 kJ)?

A

26.8 degrees

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7
Q

Calculate the SHC of a 3kg piece of metal which experiences a temperature rise of 25 degrees when heat is supplied to it at a rate of 60 Watts for 10 minutes, if a total of 3000J escapes to the surroundings.

A

Step 1: E = Pt
- 60 * 10 * 60 = 36, 000 J
Step 2: subtract dissipated energy
- 36,000 J - 3000 J = 33,000 J
Step 3: plug values into formula
- E = m * c * temp change
33,000 = 3 * 25 * c
33,000 / 75 = 440 J/kg C

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