p2.1 specific heat capacity

Question 1

What is specific heat capacity ?

Answer 1

The total energy needed to raise 1kg of a substance by 1 degree celsius

Question 2

What is the unit for specific heat capacity ?

Answer 2

J/kg*C

Question 3

specific heat capacity equation

Answer 3

The equation for specific heat capacity is ΔE = mcΔT, where:
ΔE: is the change in thermal energy (in Joules),
m: is the mass of the substance (in kilograms),
c: is the specific heat capacity of the substance (in J/kg°C), and
ΔT: is the change in temperature (in degrees Celsius or Kelvin).

Question 4

What is water’s specific heat capacity ?

Answer 4

The specific heat capacity of water is 4,200 Joules per kilogram per degree Celsius (J/kg°C). This means that it takes 4,200 J to raise the temperature of 1 kg of water by 1°C.

Question 5

Describe the method to a practical investigating the specific heat capacity of aluminium

Answer 5

-Place an electrical immersion heater into the central hole at the top of a weighed metal block.

-Connect the heater in series with an ammeter and in parallel with a voltmeter.

-Place the thermometer into the smaller hole. Add two drops of oil into the hole to make sure the thermometer is surrounded by hot material.
Insulate the block by wrapping it with cotton wool.

-Record the temperature of the block.

-Connect the heater to the power supply and turn it on for ten minutes. Record the current and potential difference.

-Record the highest temperature that it reaches.

Question 6

What does a storage heater do ?

Answer 6

• uses electricity at night to heat special bricks or concrte blocks in the water
• enrgy transferred form the bricks keeps thr room warm
• the bricks have a specific heat capacity so they store lots of energy
• they warm up slowly when heat element it on and cool down slowly when heater element is off

Question 7

when a substance is heated its temperature rise depends upo

Answer 7

• amount energy applied
• mass of substance

-what the substance is