Define the filtration model
Define the filtration model using supplied evidence and a solved model.
About 18 minutes, plus any extended practice
Supplied materials
- All measurements and observations below are supplied classroom examples. They are not data from actual learners or a claim about a particular real site.
- Paper, drawing space or a browser document.
- Reference card A: filter catches listed particles. Reference card B: material may pass through this particle filter.
- Assessment case 1: Which scientific label fits the specifically described step or feature? Supplied case: Sand remains on filter.
- Assessment case 2: Which scientific label fits the specifically described step or feature? Supplied case: Dissolved salt passes through in record.
- Assessment case 3: Which scientific label fits the specifically described step or feature? Supplied case: Liquid travels through filter.
- Assessment case 4: Which scientific label fits the specifically described step or feature? Supplied case: Clear output is not certified safe.
- Assessment case 5: Which scientific label fits the specifically described step or feature? Supplied case: Visible dirt is caught.
- Assessment case 6: Which scientific label fits the specifically described step or feature? Supplied case: Unknown microbes were not tested.
Learn the idea
A filter can retain some particles while other material passes through. Clear-looking water is not necessarily safe to drink. All inputs are supplied records; never drink model-test water.
Particle retention means filter catches listed particles. Dissolved material means material may pass through this particle filter. Flow means liquid moves through the filter. Safety limit means clarity does not establish drinkability.
For particle retention, look for the clue “filter catches listed particles.” For dissolved material, look for “material may pass through this particle filter.” More than one process can happen in a real situation. Answer about the one described in this question.
- Read or listen to the four science words and what each means. Say how the first two differ.
- Choose two of the short cases. Point to the clue that helps you choose a science word for each one. You may draw or say your answer.
- Answer each practice question. Say which clue helped you, then check the explanation.
- Use the extra task to make two examples that show different science words. Draw or say what makes each one fit.
See the method in action
Worked reference-card problem: a card states “filter catches listed particles”; a second states “material may pass through this particle filter.” The first fits particle retention and the second fits dissolved material. The reason is the described function or change, not the order of the cards or a favorite name. If their descriptions exchange places, their category labels exchange too. Keep the supplied descriptions attached to the correct case.
Check your reasoning
Your answer is temporary and is not saved to an account. Download your current answer before leaving or reloading. Written work on paper or in another app stays in your own file.
Helpful tips
- Use the feature “filter catches listed particles” to justify particle retention; do not sort by the name alone.
- Distinguish dissolved material (material may pass through this particle filter) from a different process occurring in the same situation.
See the answer and explanation
particle retention
The answer is particle retention. In the notes, it means “filter catches listed particles.” A filter can retain some particles while other material passes through. Clear-looking water is not necessarily safe to drink. All inputs are supplied records; never drink model-test water.
Take it further
Create one new case showing particle retention and one showing dissolved material. Expected: the first explicitly shows “filter catches listed particles”; the second explicitly shows “material may pass through this particle filter.” Explain the distinction by drawing, speaking or writing. A label without a matching feature is incomplete.
Nothing here is saved to an account or sent to a teacher. The answer download includes your current choice and any checked feedback. It does not include choices from the separate More practice section. Download that section separately.
More practice: try new cases
Choose an answer for each problem. Explain your method on paper, then use the feedback to decide what to revisit.
Your choices are temporary. Feedback appears after you check all the answers.
Nothing here is saved to an account or sent to a teacher. Keep your own notes or download them before leaving. The score describes these questions; it does not certify subject mastery.
Check the subject sources
These LifeStarter passages, scenarios and exercises are authored for this Academy with AI assistance and review. External resources keep their publishers’ terms. A grade label suggests a starting level; it does not establish alignment with your school’s complete requirements.