NCUK IFY Physics - N) Thermal Properties of Materials

Energy needed to heat 1kg of material by 1 degree

• Latent heat

• Internal energy

• Specific heat capacity

• Temperature

Unit of specific heat capacity

• $Jkg^{-1}K^{-1}$

• $JkgK^{-1}$

• $Jkg^{-1}K$

• $JKg^{-1}K^{-1}$

A $1kW$ kettle heats $2kg$ of water for  $34s$ . What is the temperature change in kelvin (answer to 1dp)?  $\left(c=4.2kJkg^{-1}K^{-1}\right)$ 

(a)  

To experimentally find the specific heat capacity of a material, what needs to be measured?

• Mass of material

• Initial temperature

• Power of heater

• Final temperature

• Time of heating

Energy needed to melt 1kg of material

• Latent heat of fusion

• Internal energy

• Specific heat capacity

• Latent heat of vaporisation

Energy needed to boil 1kg of material

• Latent heat of fusion

• Internal energy

• Specific heat capacity

• Latent heat of vaporisation

Solids have...

• strong bonds

• weak bonds

• no bonds

Liquids have...

• strong bonds

• weak bonds

• no bonds

Gases have...

• strong bonds

• weak bonds

• no bonds

It takes energy to...

• weaken bonds

• break bonds

• form bonds

• strengthen bonds