Mixtures, Solutions & Separation — Practice · Grade 6 Science
Chapter: Matter, Mixtures & Water PropertiesWhat this practice covers
By the end of Mixtures, Solutions & Separation you should be able to:
- I can explain why the components of a mixture can be separated but those of a compound cannot.
- I can use solubility figures to predict how much of a solid will dissolve.
- I can choose a separation method by naming the property difference it exploits.
8 questions, written answer and multiple choice, each with a worked explanation.
Vocabulary used: solution, solute, evidence, system boundary, uncertainty.
Problem 1
Answer and explanation
No. Its particles remain in the solution, contributing mass and properties even though they are not individually visible.
Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.
Problem 2
Answer and explanation
No. The solute and volume both double, leaving the same ratio under this definition.
Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.
Problem 3
Answer and explanation
Dissolved salt passes through with the water. Removing visible sand does not establish pure water.
Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.
Problem 4
Answer and explanation
No. Identify retained material, loss pathways, and measurement uncertainty before assigning a cause.
Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.
Problem 5
Answer and explanation
After removing 3 g sand, 105 g of salt solution remains in the idealized model. After water enters the air, 5 g salt remains. The water is transferred, not destroyed. Real recovery may be incomplete; these assumptions do not show that the liquid was safe to drink.
Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.
Problem 6
Answer and explanation
No. Filter pore size and other treatment properties matter. Visible clarity alone cannot establish removal of dissolved substances or drinking safety.
Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.
Problem 7
- solution: A mixture with dissolved particles distributed through a solvent at the particle scale.
- A dissolved substance has ceased to exist.
- Removing visible particles automatically produces safe pure water.
- One illustrative result establishes every real condition and needs no further evidence.
Answer and explanation
solution: A mixture with dissolved particles distributed through a solvent at the particle scale.
A mixture with dissolved particles distributed through a solvent at the particle scale. After removing 3 g sand, 105 g of salt solution remains in the idealized model. After water enters the air, 5 g salt remains. The water is transferred, not destroyed. Real recovery may be incomplete; these assumptions do not show that the liquid was safe to drink.
Problem 8
- A dissolved substance has ceased to exist.
- solute: The substance dissolved in a solution.
- Removing visible particles automatically produces safe pure water.
- One illustrative result establishes every real condition and needs no further evidence.
Answer and explanation
solute: The substance dissolved in a solution.
The substance dissolved in a solution. After removing 3 g sand, 105 g of salt solution remains in the idealized model. After water enters the air, 5 g salt remains. The water is transferred, not destroyed. Real recovery may be incomplete; these assumptions do not show that the liquid was safe to drink.