63eb0-c454-4b6f-ac76-e7aa1e9a3a56","label":null,"content":"The graph below shows how the volume of a $5.0\\text{ kg}$ sample of a liquid, Compound Gamma, changes with temperature.\n\n![Volume vs Temperature for Compound Gamma](https://assets.mathsgenie.co.uk/aqa-qb/46e867b4-8821-4bef-8ef4-9bb2f3f9ce51.png)\n\nDescribe how the density of Compound Gamma changes with temperature over the range shown in the graph.\n\nCalculations are not required.","markscheme":"- States that the density decreases to a minimum and then increases M1\n- Identifies that the minimum density occurs at $55\\text{ }^\\circ\\text{C}$ A1","marks":2,"order":0,"markingRubric":null,"explanation":{"methods":[{"id":"read_graph_density","label":"Read the graph","steps":[{"type":"text","order":0,"title":"Use the density equation","content":"The sample's mass stays constant at $5.0\\,\\text{kg}$. Density is given by\n\n$$\\rho=\\frac{m}{V}$$\n\nSo, when the volume increases, the density decreases; when the volume decreases, the density increases. This is the key inverse relationship to describe, and no calculation is needed.","highlights":[{"text":"Calculations are not required.","location":"specification"}]},{"type":"text","order":1,"title":"Read the graph","content":"The graph shows volume increasing from $20\\, ^\\circ\\mathrm{C}$ to $55\\, ^\\circ\\mathrm{C}$, so the density decreases over this interval. The volume then decreases as the temperature rises above $55\\, ^\\circ\\mathrm{C}$, so the density increases. This earns M1: the density decreases to a minimum and then increases.\n\nThe largest volume, and therefore the minimum density, occurs at $55\\, ^\\circ\\mathrm{C}$. This earns A1.","highlights":[{"text":"Calculations are not required.","location":"specification"}]}]}],"generatedAt":"2026-07-22T11:30:10.031Z","modelVersion":"gpt-5.6-terra+diagrams-1","explanationVersion":"v3"},"options":[]}],"options":[],"explanation":null,"firstAttemptFullMarks":null},{"id":"75a9bc12-23e2-4ece-a47b-886492f30350","revisionId":"5eff0018-0cee-4844-afd0-d062b4d123fc","questionNumber":null,"questionType":"LA","specification":"A scientist is studying the behavior of nitrogen as it transitions from its solid crystalline state to its liquid state during a cryogenic cooling process.","difficulty":3,"difficultyBand":"medium","totalMarks":3,"sourceTitle":null,"calculatorUse":null,"parts":[{"id":"71b3c46a-7480-4774-8f4f-5ad9abc9119c","label":null,"content":"Describe, in terms of particles, **two** differences between a solid and a liquid of the same substance.","markscheme":"- Particles in a solid are arranged in a regular, ordered pattern, whereas particles in a liquid are randomly/irregularly arranged. B1\n- Particles in a solid only vibrate about fixed positions, whereas particles in a liquid can move and slide past one another. B1\n- The forces of attraction holding the particles together are stronger in a solid than in a liquid. B1","marks":3,"order":0,"markingRubric":null,"explanation":{"methods":[{"id":"particle_comparison","label":"Compare the particles","steps":[{"type":"text","order":1,"title":"Compare arrangement","content":"Give two direct particle-level comparisons. First compare their arrangement: in a solid, particles are arranged in a **regular, ordered pattern**, whereas in a liquid they are **randomly/irregularly arranged**. This earns **B1** because it gives the solid-versus-liquid difference in particle arrangement."},{"type":"text","order":2,"title":"Compare movement","content":"In a solid, particles only **vibrate about fixed positions**. In a liquid, particles can **move and slide past one another**. This comparison earns **B1**.","highlights":[{"text":"liquid state","location":"specification"}]}]}],"generatedAt":"2026-07-22T11:10:54.395Z","modelVersion":"gpt-5.6-terra+diagrams-1","explanationVersion":"v3"},"options":[]}],"options":[],"explanation":null,"firstAttemptFullMarks":null}],"subjectCode":"gcse_physics","summaries":[{"id":"00859c27-34a6-4126-a220-451b91dc09e0","diffic

Density and states of matter

Question 7

Density and states of matter Questions

Density and states of matter

Question 7

Density and states of matter Questions