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 explain the shape, volume and compressibility of solids, liquids and gases using how strongly their particles interact and how far apart they are. (Guide: “Why solids, liquids and gases behave differently”, Figure 1; Practice Q4)
- I can say what makes a substance a fluid and explain why air counts as one. (Guide: “What counts as a fluid”; Practice Q2, Q7)
- I can use the words mass, volume, weight and density correctly, each with its unit. (Guide: vocabulary table; Practice Q5)
- I can explain why cutting a uniform object does not change its density. (Guide: “Density: mass per unit volume”; Practice Q3)
- I can state the two properties of an ideal fluid and say when water, honey or air fails to fit the model. (Guide: “The ideal-fluid model”; Practice Q7)
Skills
- I can calculate density, mass or volume from ρ = m / V, including the volume of a box or cylinder. (Guide: Worked example 1; Practice Q5)
- I can convert densities between g/cm³ and kg/m³, and volumes between mL, L and m³. (Guide: “Converting units”; Practice Q1, Q5)
- I can find the average density of an object made of several parts by adding masses and adding volumes. (Guide: Worked example 3)
- I can plot mass against volume, draw a best-fit line and use its slope to find a density. (Guide: Worked example 2, Figure 2; Practice Q6)
- I can describe how to measure the volume of an irregular object by water displacement. (Guide: Worked example 2)
Reasoning
- I can compare the densities of two objects using ratios of mass and volume. (Practice Q3)
- I can design a density experiment where an unknown container mass cancels out, and explain what the graph’s intercept means. (Practice Q6)
- I can evaluate a claim that a fluid’s density cannot change, using the particle picture of gases and liquids. (Practice Q7)
All ticked? Move on to Topic 8.2, Pressure, or return to the course roadmap.