specific heat capacity

Question 1

how do we determine how much energy is stored in hot water for e.g?

Answer 1

looking at the specific heat capacity

Question 2

what is specific heat capacity

Answer 2

The specific heat capacity of a substance is the amount of energy required to raise the temperature of 1 kg of the substance by 1°C

Question 3

calculate The energy calculate the energy required to increase the temperature of 2 kg of water from 20°C to 100°C the specific heat capacity of water is 4200 J/KG°C

Answer 3

672 000J

🔼E= 2 x 4200J/kg°C x 80°C
672000J

🔼E= mcΔ0

🔼E= change in thermal energy(J)
m=mass(kg)
c=specific heat capacity(J/Kg°C)
🔼0=change in temperature(°C)

Question 4

an iron has an aluminium plate with a mass of 1.5 kg. Calculate the thermal energy is stored in the plate when the temperature rises from 20°C to 200°C. The specific heat capacity of aluminium is 913 J/KG°C

Answer 4

246510J
180°C x 913J/kg°C x 1.5kg
= 246510

Question 5

A hot water bottle cools down from 80°C to 20°C releasing 756,000 J of thermal energy.
the mass of the water in the hot water bottle.
The specific heat capacity of water is
4200J/KG°C

Answer 5

mass = 3kg

🔼E= m x c x 🔼0
m = 🔼E / c x 🔼0
m=756 000J / 4200J/kg°C x 60°C
m= 2.953125kg
m= 3kg

Question 6

what is internal energy

Answer 6

internal energy is the energy stored inside a system by the particles. This includes the kinetic energy of the particles (due to the movement) and the potential energy of the particles (due to forces between particles and also the bonds between atoms in a molecule)