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Grade 6 · unit review

Review: Particles, Density and Separation

Connect particle arrangements to measurable material properties.

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Bring the unit skills together

Use these 4 new cases to check your reasoning. Choices are temporary and are not saved to an account, sent to staff or recorded as school grades. Download your current review choices before leaving or reloading.

Unit review questions
1. Which scientific label fits the specifically described step or feature? Supplied case: Single neon particle.
Need a hint?
  • Look for the described feature: one chemical building unit.
  • Compare the given mechanism with the other labels; do not infer unmentioned events.
2. Supplied case 5: mass (g)=72; volume (cm³)=24, using the explicitly named quantities. Density equals mass in grams divided by volume in cubic centimeters. What result follows?
Need a hint?
  • Density equals mass in grams divided by volume in cubic centimeters.
  • Use sample mass and sample volume together.
3. Supplied case 5: density (g/cm³)=6; volume (cm³)=4, using the explicitly named quantities. Mass equals density in grams per cubic centimeter multiplied by volume in cubic centimeters. What result follows?
Need a hint?
  • Mass equals density in grams per cubic centimeter multiplied by volume in cubic centimeters.
  • The volume unit must match the density denominator.
4. Which scientific label fits the specifically described step or feature? Supplied case: Particles differ in filter retention.
Need a hint?
  • Look for the described feature: different particle sizes are retained differently.
  • Compare the given mechanism with the other labels; do not infer unmentioned events.

The download contains your current choices and any checked feedback. Keep the separate transfer-task work in your own document; downloading its instructions does not mark it complete.

Use the skills in a new task

Create a four-panel explanation for “Particles, Density and Separation” using one supplied case from each lesson. Include the observation, scientific mechanism or calculation, result and a limitation. You may draw and speak your explanation; all inputs are supplied.

Work on paper or in your own document. Explain the choices you made.

  • Use one supplied case from each of the four lessons.
  • Name the relevant structure, quantity or process in every panel.
  • Show calculations with units or a causal evidence chain.
  • Distinguish source facts from fictional classroom data.
  • State a model limit or a condition that would change the result.
Compare with a model response

Panel 1: A particle drawing has four isolated helium atoms and no bonds. If two are removed, what remains? Which inference or prediction is best supported? Result: Two helium atoms, still not a bonded molecule.. Reasoning: Particle count changes without a supplied bonding or identity change. Model limitation: only the stated classroom boundary and supplied observations are established; unmeasured real-world performance remains unverified. Panel 2: Supplied case 1: mass (g)=24; volume (cm³)=8, using the explicitly named quantities. Density equals mass in grams divided by volume in cubic centimeters. What result follows? Result: 3 g/cm³. Reasoning: Substitute the supplied values: (24)/(8) = 3 g/cm³. Density compares mass with volume. A larger sample need not be denser. Model limitation: only the stated classroom boundary and supplied observations are established; unmeasured real-world performance remains unverified. Panel 3: Supplied case 1: density (g/cm³)=2; volume (cm³)=8, using the explicitly named quantities. Mass equals density in grams per cubic centimeter multiplied by volume in cubic centimeters. What result follows? Result: 16 g. Reasoning: Substitute the supplied values: (2)*(8) = 16 g. Multiply density by volume. Use the stated uniform-material assumption. Model limitation: only the stated classroom boundary and supplied observations are established; unmeasured real-world performance remains unverified. Panel 4: The supplied screen passes sand grains but blocks larger beads. Which result is predicted? Which inference or prediction is best supported? Result: Beads remain while sand passes through.. Reasoning: The size difference matches the screen openings; separation does not change identity. Model limitation: only the stated classroom boundary and supplied observations are established; unmeasured real-world performance remains unverified.

A different response can also meet the criteria. Compare the evidence and reasoning, rather than copying the wording.