THER heating curve - Contents
- Page 1Introduction - ReviewIntroduction to the three phases of water and the energy changes that accompany interconversion between these using the terms endothermic and exothermic
- 4 marksPage 2QuestionsThree question pages concerned with the energetics of interconversion between the various phases of water
- 2 marksPage 3Endothermic?
- 2 marksPage 4Exothermic?
- Page 5Heating curve - ReviewDisplay and explanation of the heating curve of water which shows that at some temperatures added heat does not cause a temperature change
- 4 marksPage 6QuestionsTwo questions interpreting the shape of the heating curve and assigning phases to the various regions ofo the curve
- 11 marksPage 7Phases of water
- Page 8Separting particles - ReviewDiscussion of why added heat does not cause a temperature change at the melting and boiling temperatures of the substance to which heat is being added
- 3 marksPage 9QuestionsTwo question pages where users identify a particle view of the various phases of matter and use the heating curve to calculate the heat required for melting and boiling
- 3 marksPage 10Energy required
- Page 11Adding heat - ReviewDescription of how the temperature change when heat is added depends both on the mass of substance and the nature of the substance AND how the heat is transferred between the system and the surroundings
- 5 marksPage 12QuestionsTwo questons in which the heat required for a phase change of water is calculated
- 5 marksPage 13Calculating heat
- Page 14Heat capacity - ReviewLooking at the curve and realising that the heat required for a temperature change is different for the liquid, solid and gas phases of water
- 5 marksPage 15QuestionCalculating from the data in the graph the specific heat capacities of liquid water, ice and water vapour
- Page 16Stepwise calculation - ReviewIntroduction to fact that the heat required/released in conversion of one phase of water to another depends on the initial and final states, not on the pathway. Therefore the sum of the heat required/released for a series of steps between two states is the same as the direct pathway.
- 7 marksPage 17QuestionsCalculation of heat required for two conversions of one state of water to another. In both cases this can be calculated using a stepwise approach.
- 7 marksPage 18Pathway calculation