What is a mixture?
Separating a mixture of sulphur and iron filings using a magnet. Separating a mixture of water and salt using filtration. Miscable (e.g. water and alcohol) and immiscable liquids (e.g. water and oil) Separating immiscable liquids using a separating funnel. Recap work on elements, compounds and their symbols.
Differentiate between a compound such as Carbon Monoxide (CO - containing Carbon and Oxygen) and Cobalt (Co) Introduce idea of dissolving. What happens during the process of dissolving. What factors affect the speed of dissolving? Terminology Solvent - the liquid in which a substance is dissolved Solute - the solid substance to be dissolved Solution - The name given when a solute has been dissolved in a solvent Concentration - The mass of solute that is dissolved in a certain volume of solvent Soluble - The ability of solute to be dissolved in a given solvent Investigation: how much salt can be dissolved in 100 ml of water. Class practical. Each pair to do a different mass of salt ranging from 20-40 grams. Results collated. Maximum mass of salt dissolved in water is about 30 g. Once no more solute can be dissolved we say that the solution is saturated. |
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