There are some solids directly change to the gaseous state. What are they called? Name and define the process by which these solids change into gases. Draw a well-labelled diagram to show the process.
Important Questions on Separation of Substances
Solve the given crossword puzzle.
Across:
4. The scientific name for a substance that dissolves in the solvent.
5. Dissolving can be sped up by doing this.
6. Forms when a solvent evaporates from a saturated solution.
8. Formed when a solute dissolves in a solvent.
10. Formed when two or more atoms join together chemically.
12. Made from different substances that are not chemically joined.
15. Used to separate 2 liquids when one has a different boiling point than the other (two words)
16. A substance made from two or more different elements that have been chemically joined.
17. Used to separate a solid mixed with a liquid.
19. A solution that contains only a small amount of solute is said to be this.
Down:
1. Consists of atoms all with the same proton number.
2. Adding more solute to a solution will make it more_____.
3. Used to separate a solid dissolved a liquid when you want to collect both the solid and the liquid.
7. The technique used to separate a mixture of 2 or more coloured pigments.
9. Substances that dissolve are said to be_____.
11. The technique used to recover a solid dissolved in a liquid.
13. The liquid that dissolves solutes.
14. A solution will become this when no more solute will dissolve into it.
18. Substances that do not dissolve are said to be_____.
