Work through the list without notes. If you cannot do a statement, follow its link, then come back. Guide = study guide; Practice = practice questions.
Understanding
- I can say what the vertical axis, the horizontal axis, the levels and the arrow on an energy diagram each represent. (Guide: “What an energy diagram shows”)
- I can tell from the levels whether a process is endothermic or exothermic, and give the sign of ΔH. (Guide: “Reading endothermic and exothermic”; Practice Q1)
- I can explain why the position of zero on the energy axis does not change ΔH. (Guide: Worked example 3; Practice Q4)
- I can explain why a hump or a catalyst does not change whether a process is endothermic or exothermic. (Guide: “Diagrams with a hump”)
Skills
- I can calculate ΔH as the final level minus the starting level, with the correct sign. (Practice Q2)
- I can label an energy axis with a quantity and units, choose an even scale and place levels on it accurately. (Guide: Worked example 1; Practice Q5)
- I can draw the diagram for the reverse of a process and give its ΔH. (Guide: Worked example 1; Practice Q5(c))
- I can draw an energy diagram for a phase change, with gas above liquid above solid. (Guide: Worked example 3; Practice Q3)
- I can draw a three-step diagram for dissolving and read the overall energy change from it. (Guide: Worked example 2; Practice Q7)
Reasoning
- I can use a dissolving step diagram to predict whether the water warms or cools, and justify it. (Practice Q7(b))
- I can find and correct errors in someone else’s energy diagram. (Practice Q6)
- I can explain why two arrows of similar length on different diagrams may show very different energy changes. (Guide: Figure 1)
All ticked? Move on to Topic 6.3, Heat Transfer and Thermal Equilibrium, or return to the course roadmap.