Presentation is loading. Please wait.

Presentation is loading. Please wait.

TP Be able to Define thermal capacity. Explain the significance of high and low specific capacities.

Published byBuck Perkins Modified over 9 years ago

Similar presentations

Presentation on theme: "TP Be able to Define thermal capacity. Explain the significance of high and low specific capacities."— Presentation transcript:

1 TP Be able to Define thermal capacity. Explain the significance of high and low specific capacities.

2 HEAT CAPACITY The amount of thermal energy needed to raise the temperature of substance by 1 0 C. It is measured in J/kg. SPECIFIC HEAT CAPACITY(S.H.C) The amount of thermal energy needed to raise the temperature of 1kg of substance by 1K. It is measured in J/kg/ 0 C. SubstanceS.H.C/ J/kg/K water4200 Ethanol2500 Olive oil2000 Air1000 Water vapour2020 SubstanceS.H.C/ J/kg/K Aluminium900 Steel420 Copper400 Gold300 Glass670 Ice2100 Polythene2300

3 HIGH S.H.C Water has a very high S.H.C, so it takes more energy to heat up water. Oceans stores huge amount of energy but causes less change in temperature. Metals have low S.H.C, they require small amounts of energy to change their temperature. Two objects of same are placed in hot water? Which object has a higher Heat capacity?

4 Specific Heat Equation Q = m C  T Q = thermal energy m = mass C = specific heat  T = change in temp The specific heat of silicon is 700 J / kg/ ºC. How much energy is needed to raise a 7 kg of silicon by 10 ºC ? Q = m C  T = 7 x 700x10=49000J c = 700; m= 7kg;  T = 10 0 C Q m C TT

5 Latent Heat The word “latent” means “to lie hidden.” When a substance changes state energy is transferred without a change in temperature. This “hidden energy” is called latent heat. The energy absorbed is used to increase potential energy of the molecules. Latent heat of fusion - Solid to liquid Latent heat of vaporization - Liquid to gas

6 TP Be able to Calculate latent heat of fusion and latent heat of vaporisation

7 Specific Latent Heat of fusion The amount of energy required to melt 1kg of a solid at constant temperature. It is measured in J/kg Example: Water 330,000 J/kg Specific Latent heat of vaporisation (L v ) The amount of energy required to change 1kg of a liquid to a gas at its boiling point. Example Water: 2, 260, 000 J/kg

8 Latent Heat Formula 1.Find the amount of energy required to melt 5 grams of solid gold. L f = 6440 J / g. 2. Calculate heat required to 500g of ice. L f =340J/g 3. 20kJ of energy was used to melt 50kg of a substance. Find the latent heat of fusion of the substance. Q = m L f or Q = m L v Q = thermal energy m = mass L = heat of fusion or vaporization

Download ppt "TP Be able to Define thermal capacity. Explain the significance of high and low specific capacities."

Similar presentations

4.3.3 Thermal properties of materials

4.3.3 Thermal properties of materials
P1a (ii) Heating Houses You will learn about: Factors that affect the amount of energy needed to change the temperature of a substance (Specific Heat Capacity)

P1a (ii) Heating Houses You will learn about: Factors that affect the amount of energy needed to change the temperature of a substance (Specific Heat Capacity)
Thermal Capacity Specific Heat Capacity Melting & Boiling Condensation & Solidification.

Thermal Capacity Specific Heat Capacity Melting & Boiling Condensation & Solidification.
Heating/Cooling Curve & Energy Calculations. Which of the following measures the average kinetic energy of a sample? 1.Mass 2.Volume 3.Specific heat 4.Temperature.

Heating/Cooling Curve & Energy Calculations. Which of the following measures the average kinetic energy of a sample? 1.Mass 2.Volume 3.Specific heat 4.Temperature.
Aim: How to measure energy absorbed during a phase change

Aim: How to measure energy absorbed during a phase change
Last lesson?. Thermal capacity Thermal capacity is the amount of energy needed to raise the temperature of a substance by 1K.

Last lesson?. Thermal capacity Thermal capacity is the amount of energy needed to raise the temperature of a substance by 1K.
Terms Energy Heat Calorie Joule Specific heat Calorimeter Thermochemistry.

Terms Energy Heat Calorie Joule Specific heat Calorimeter Thermochemistry.
Specific Heat Capacity Objectives (a) define and apply the concept of specific heat capacity; (b) select and apply the equation E = mcΔθ; (c) describe.

Specific Heat Capacity Objectives (a) define and apply the concept of specific heat capacity; (b) select and apply the equation E = mcΔθ; (c) describe.
Specific Heat. Names Specific Heat Capacity Specific Heat Heat Capacity.

Specific Heat. Names Specific Heat Capacity Specific Heat Heat Capacity.
Warmup 1) Solve for x 689 = (1.8)(x)(45.2 – 27.4) 689 = (1.8)(x)(17.8) 2) On a hot summer afternoon, you get into the car, and it’s unbearably HOT inside!

Warmup 1) Solve for x 689 = (1.8)(x)(45.2 – 27.4) 689 = (1.8)(x)(17.8) 2) On a hot summer afternoon, you get into the car, and it’s unbearably HOT inside!
Energy Requirements for changing state: In ice the water molecules are held together by strong intermolecular forces. The energy required to melt 1 gram.

Energy Requirements for changing state: In ice the water molecules are held together by strong intermolecular forces. The energy required to melt 1 gram.
Thermal Insulators and Conductors Thermal Conductivity: The ability to conduct heat. Thermal Insulators do not conduct heat readily. Generally, metals.

Thermal Insulators and Conductors Thermal Conductivity: The ability to conduct heat. Thermal Insulators do not conduct heat readily. Generally, metals.
Thermal Properties of Matter

Thermal Properties of Matter
5.3a Thermal Physics Thermal Energy

5.3a Thermal Physics Thermal Energy
LATENT HEAT Changes in State. E NERGY AND S TATES OF M ATTER  The energy and organization of the particles in a sample of matter determine the physical.

LATENT HEAT Changes in State. E NERGY AND S TATES OF M ATTER  The energy and organization of the particles in a sample of matter determine the physical.
Can you stick the sheet in please?

Can you stick the sheet in please?
Calculating Heat. Specific Heat Amount of heat energy needed to raise the temp of 1 ml of a substance 1°C For water the specific heat is 4.19 J/g °C,

Calculating Heat. Specific Heat Amount of heat energy needed to raise the temp of 1 ml of a substance 1°C For water the specific heat is 4.19 J/g °C,
Warmup Given the following equations: H 3 BO 3(aq)  HBO 2(aq) + H 2 O (l) ΔH rxn = -0.02 kJ H 2 B 4 O 7(aq) + H 2 O (l)  4HBO 2(aq) ΔH rxn = -11.3 kJ.

Warmup Given the following equations: H 3 BO 3(aq)  HBO 2(aq) + H 2 O (l) ΔH rxn = kJ H 2 B 4 O 7(aq) + H 2 O (l)  4HBO 2(aq) ΔH rxn = kJ.
Thermodynamics Ch 10 Energy Sections 10.4-10.6. Thermodynamics The 1st Law of Thermodynamics The Law of Conservation of Energy is also known as The 1st.

Thermodynamics Ch 10 Energy Sections Thermodynamics The 1st Law of Thermodynamics The Law of Conservation of Energy is also known as The 1st.
Heat Objectives –Be able to distinguish between heat and temperature –Be able to explain thermal equilibrium –Identify the three ways heat can be transferred.

Heat Objectives –Be able to distinguish between heat and temperature –Be able to explain thermal equilibrium –Identify the three ways heat can be transferred.

Similar presentations

Ads by Google