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Atoms Assessment Rubric Guide

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Atoms Assessment Rubric Guide

A food scientist is investigating what happens to matter when it is heated, cooled or mixed. Use the particle model to explain the evidence and show what you understand about atoms and molecules. Read the rubric, then complete the assessment tasks. Use scientific vocabulary and give reasons for your ideas.

What strong science work looks like

Use these criteria to check your responses. A strong Year 7 explanation: (1) describes atoms and molecules accurately; (2) uses evidence from a situation to explain particle behaviour; (3) uses terms such as solid, liquid, gas, particle, atom, molecule and temperature correctly; and (4) communicates a clear claim with a scientific reason. You do not need complicated language: precise explanations matter most.

1.Which state has particles far apart and spread throughout their container?
  • Solid
  • Liquid
  • Gas
  • All three states
2.Explain one difference between how particles are arranged in a solid and a liquid.
3.A sealed jar of water vapour is cooled until droplets form on the inside. Name the change of state and explain what happens to the particles.

Use evidence like a scientist

A student warms a sealed syringe containing air. The plunger moves out slightly. The amount of air remains the same, and no air escapes.

4.Choose the best explanation for why the plunger moves out when the trapped air is warmed.
  • The air particles become larger.
  • The particles gain energy, move faster and push against the plunger more.
  • The air changes into a liquid.
  • The number of air particles increases.
5.A classmate says, “When water boils, its atoms disappear.” Correct this statement using the words particles and gas.
6.Match each word in the left column to its meaning in the right column. Write the correct meaning beside each word.
  • Atom
  • Molecule
  • Condensation
  • Evaporation
  • A liquid changing into a gas at its surface
  • A gas changing into a liquid
  • Two or more atoms joined together
  • A tiny building block of matter
7.True or false: In a change of state, the particles themselves are created or destroyed. Give one reason for your answer.
TrueFalse
8.Complete the explanation: When a liquid evaporates, some particles at its surface gain enough energy to the liquid and become a .
9.A puddle dries faster on a warm, windy day than on a cool, still day. Explain why, using particle ideas.
10.Self-check: Which rubric area is your strongest today—accurate ideas, using evidence, scientific vocabulary or clear explanations? Name one answer you completed that shows this strength.
11.Set one specific next-step goal for studying atoms and states of matter. Include what you will practise and how you will know you have improved.

3 printable pages

  • Atoms Assessment Rubric Guide, page 1 of 3: What strong science work looks like

    Page 1

  • Atoms Assessment Rubric Guide, page 2 of 3: Use evidence like a scientist

    Page 2

  • Atoms Assessment Rubric Guide, page 3 of 3: 9. A puddle dries faster on a warm, windy day than on a cool, still day. Explain why,…

    Page 3

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