Distinguish mixing from reaction
Distinguish mixing from reaction 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: components combine without new substances. Reference card B: same substance changes solid liquid or gas.
- Assessment case 1: Which scientific label fits the specifically described step or feature? Supplied case: Sand and stones mixed.
- Assessment case 2: Which scientific label fits the specifically described step or feature? Supplied case: Water freezes.
- Assessment case 3: Which scientific label fits the specifically described step or feature? Supplied case: Record identifies newly formed rust.
- Assessment case 4: Which scientific label fits the specifically described step or feature? Supplied case: Unknown liquid changes color only.
- Assessment case 5: Which scientific label fits the specifically described step or feature? Supplied case: Same water melts from ice.
- Assessment case 6: Which scientific label fits the specifically described step or feature? Supplied case: Record confirms a new gas compound.
Learn the idea
Mixing does not always create a new substance. A chemical reaction changes substances. Appearance alone is incomplete evidence; the supplied record explicitly states whether a new substance forms.
Physical mixture means components combine without new substances. State change means same substance changes solid liquid or gas. Chemical reaction means new substances form. Insufficient evidence means record does not establish substance identity.
For physical mixture, look for the clue “components combine without new substances.” For state change, look for “same substance changes solid liquid or gas.” 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 “components combine without new substances”; a second states “same substance changes solid liquid or gas.” The first fits physical mixture and the second fits state change. 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
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Helpful tips
- Use the feature “components combine without new substances” to justify physical mixture; do not sort by the name alone.
- Distinguish state change (same substance changes solid liquid or gas) from a different process occurring in the same situation.
See the answer and explanation
physical mixture
The answer is physical mixture. In the notes, it means “components combine without new substances.” Mixing does not always create a new substance. A chemical reaction changes substances. Appearance alone is incomplete evidence; the supplied record explicitly states whether a new substance forms.
Take it further
Create one new case showing physical mixture and one showing state change. Expected: the first explicitly shows “components combine without new substances”; the second explicitly shows “same substance changes solid liquid or gas.” Explain the distinction by drawing, speaking or writing. A label without a matching feature is incomplete.
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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.