Density and States of MatterAQA GCSE Physics: Flashcards

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State the equation for density.

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State the equation for density.: ρ = m/V
What are the units of density?: kg/m³
Describe the arrangement of particles in a solid.: Closely packed in a regular pattern, vibrating in place.
Describe the arrangement of particles in a liquid.: Closely packed but randomly arranged, able to move past each other.
Describe the arrangement of particles in a gas.: Far apart, moving quickly and randomly in all directions.
Which state of matter typically has the highest density: solid, liquid or gas?: Solid (particles are most closely packed).
What happens to mass when a substance changes state?: Mass is conserved - it stays the same.
Why are changes of state called physical changes?: No new substance is formed, and the original substance can be recovered with its original properties if the change is reversed.
Name the six changes of state.: Melting, freezing, boiling, evaporating, condensing, and subliming.
Calculate the density of an object with mass 500 g and volume 0.0002 m³ (convert mass to kg first).: 0.5 kg / 0.0002 m³ = 2500 kg/m³
Why does a substance's density usually change when it changes state, even though its mass stays the same?: Because its volume changes (e.g. gases occupy far more volume than the same mass of liquid).