Separation
TEACHER’S GUIDE
CHEMISTRY
TOPIC: OBSERVATIONS AND EXPERIMENTS
USEFUL TIPS:
Student’s experiments can be done in groups.
Groups can be given different mixtures. Each group then carry out their own experiment, makes a write up of their procedure and presents to the rest of the class together with the samples obtained.
UNIT 1: MIXTURES AND PURE SUBSTANCES
This unit is suitable for senior one (S1)
BRIEF DESCRIPTION OF THE UNIT:
This unit deals with: • Methods of separating mixtures. • Methods of drying solids. • Methods of determining purity of solids and liquids.
LEARNING OBJECTIVES
Students should be able to: ➢ Define the key terms such as solution, solvent, solute, filtrate, residue, immiscible and miscible liquids, distillate, sublimation, melting and boiling points and chromatography. ➢ Use melting and boiling points to differentiate between pure and impure substances. ➢ Select appropriate methods for separating given mixtures. ➢ Describe appropriate methods of separating given mixtures. ➢ Perform simple experiments involving separation of mixtures.
TIME REQUIRED: Minimum: 16 periods of 40 minutes each
MAIN CONTENT AND CONCEPTS TO EMPHASISE:
• Criteria of purity: melting and boiling points for determining whether a substance is a mixture or pure. • Types of mixtures: uniform and non-uniform mixtures. • Provide definitions for the following terms: i. Solutions i.e. alloys as solid solutions and air as gaseous solution. ii. Solvent i.e. water as a universal solvent, ethanol, etc. iii. Solute. iv. Filtrate. v. Residue. vi. Immiscible and miscible liquids. vii. Distillate. viii. Sublimation i.e. examples of substances that sublime – iodine, ammonium salts, iron (III) chloride, aluminium chloride, etc. ix. Melting and boiling points. x. Chromatography.
TEACHING/LEARNING MATERIALS:
•
CHEMISTRY
TOPIC: OBSERVATIONS AND EXPERIMENTS
USEFUL TIPS:
Student’s experiments can be done in groups.
Groups can be given different mixtures. Each group then carry out their own experiment, makes a write up of their procedure and presents to the rest of the class together with the samples obtained.
UNIT 1: MIXTURES AND PURE SUBSTANCES
This unit is suitable for senior one (S1)
BRIEF DESCRIPTION OF THE UNIT:
This unit deals with: • Methods of separating mixtures. • Methods of drying solids. • Methods of determining purity of solids and liquids.
LEARNING OBJECTIVES
Students should be able to: ➢ Define the key terms such as solution, solvent, solute, filtrate, residue, immiscible and miscible liquids, distillate, sublimation, melting and boiling points and chromatography. ➢ Use melting and boiling points to differentiate between pure and impure substances. ➢ Select appropriate methods for separating given mixtures. ➢ Describe appropriate methods of separating given mixtures. ➢ Perform simple experiments involving separation of mixtures.
TIME REQUIRED: Minimum: 16 periods of 40 minutes each
MAIN CONTENT AND CONCEPTS TO EMPHASISE:
• Criteria of purity: melting and boiling points for determining whether a substance is a mixture or pure. • Types of mixtures: uniform and non-uniform mixtures. • Provide definitions for the following terms: i. Solutions i.e. alloys as solid solutions and air as gaseous solution. ii. Solvent i.e. water as a universal solvent, ethanol, etc. iii. Solute. iv. Filtrate. v. Residue. vi. Immiscible and miscible liquids. vii. Distillate. viii. Sublimation i.e. examples of substances that sublime – iodine, ammonium salts, iron (III) chloride, aluminium chloride, etc. ix. Melting and boiling points. x. Chromatography.
TEACHING/LEARNING MATERIALS:
•