1. A solution is a mixture of a solute and a solvent. 2. Soluble substances are able to dissolve in a liquid. 3. Insoluble substances do not dissolve in a liquid. 4. A solute is the part of a solution that dissolves in a solvent. 5. A solvent is the part of a solution that does the dissolving. 6. A concentrated solution is one that contains a lot of solute in a little solvent. 7. A dilute solution is one that contains a little solute in a lot of solvent. 8. A solution in which no more solute will dissolve is called a saturated solution. 9. Insoluble materials can be separated from liquids by filtration. 10. In filtration the liquid passes through the filter paper while the residue (insoluble solids) becomes trapped in the filter paper.
11. Soluble solids can be separated from liquids by evaporation. 12. During evaporation the liquid part is turned into a gas, leaving behind only the solid that had been dissolved.
13. Distillation also separates soluble solids and liquids. It has the added advantage of collecting both the liquid part and the soluble solids separately.
14. In distillation the liquid part is turned to a gas which is then condensed to a liquid and collected separately.
15. Chromatography is a way of separating mixtures made up of a lot of different parts.
Questions and Exercises K C
Key Concepts Rewrite the following sentences in your copybook and fill in the blanks. 1. A ________________ is made up of two or more different types of particles mingled together.
2. A solution is a mixture of a ____________ and a ________________. 3. A ________________ is the part of a solution that is dissolved. 4. A ________________ is the part of a solution that does the dissolving. 5. A substance that can dissolve in a solvent is said to be ________________. 6. A substance that cannot dissolve is ________________. 7. Solutions that have a lot of solute in a little solvent are ________________. 8. ________________ solutions have very little solute in the solvent. 9. A ________________ solution is one in which no more solvent will dissolve. 10. Filtration separates ________________ solids from ________________. 11. Evaporation separates ________________ solids from ________________.
