Energy changes - Heating ICe 12/01/2019 Objective To record and interpret the temperature of water during melting and boiling. The specific latent heat of a substance is the energy required per kilogram to change its state without any change in temperature.

Energy = mass x specific latent heat 12/01/2019 The specific latent heat of a substance is the energy required per kilogram to change its state without any change in temperature. Energy measure in Joules, Mass in kg and SLH in J/kg SLH of fusion is for melting. SLH of vaporisation is for boiling. Energy = mass x specific latent heat

Equipment & Method Equipment Method Ice Beaker Thermometer Bunsen Burner Stopwatch Tripod Gauze Heatproof Mat

Specific latent heat questions Specific latent heat of water is 2 300 000 J/kg . 1. Calculate the quantity of heat energy required to: convert 2 kg of water at 100 oC into steam convert 3kg of ice into water at 0 oC. 2. Calculate the mass of water that can be converted into steam using 100,000J of energy

Energy changes Time (Secs) Temperature (degrees Celsius)

Changes of State Temperature Boiling  Condensing  Melting  Gas Liquid  Gas Liquid Melting  Freezing Solid  Liquid Solid Time

Solids, Liquids and Gases - Density Solid Liquid Gas When a substance is changing state the energy goes into ...... Otherwise the energy goes into .......