GCSE · Compound units & rates

Density and pressureExam-style questions

Why density is mass packed into one unit of volume and pressure is force spread over one unit of area, how to rearrange both formulas by sense rather than by triangle, and why a mixture's density is never the average of the two densities.

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19 questions · GCSE (Higher) level · mark scheme and worked solution on each · no sign-up to try

DifficultyAllLevel 1Level 2Level 3Level 4Level 5
  1. 1
    An alloy is made by mixing 150 cm³ of metal A, which has density 4.2 g/cm³, with 100 cm³ of metal B, which has density 6.7 g/cm³.

    Work out the density of the alloy.
    Level 5 · 4 marksTry it
  2. 2
    An alloy is made by melting together 400400 g of metal PP and 270270 g of metal QQ.

    Metal PP has density 88 g/cm³. Metal QQ has density 4.54.5 g/cm³.

    Work out the density of the alloy. Give your answer correct to 3 significant figures.
    Level 5 · 4 marksTry it