Science Form 1, 2 & 3 Notes
Question 1:Define compound. Answer:A compound is a substance consisting of two or more elements combined chemically. Question 2:List five examples of compounds. Answer:Sugar, salt, water, marble, building blocks. Question 3:How can you separate a compound? Answer:Through electrolysis Question 4:State the differences between a mixture and a compound. Answer:
Activity 6.11:Aim: To produce a compoundMaterials and apparatus: Sulphur powder, iron powder, Bunsen burner, crucible with lid, tripod stand, pipeclay triangle, weighing balanceProcedure1. Put one spatula of sulphur powder and one spatula of iron powder into the crucible. Stir well. Record the colour of the mixture.2. Weigh the mixture. Record the initial mass.3. Heat the … Read more
Question 1:Define mixture. Answer:A mixture is a substance that consists of two or more elements or compounds combined physically. Question 2:Match the following mixtures according to its suitable separation method. Answer: Question 3:If you were given a mixture that contains rice and sand, can you separate them using filtration method? Why? Answer:No, because filtration can … Read more
Activity 6.8:Aim: To separate a mixture using the floatation method.Materials and apparatus: Mixture of water and oil, beakers, separating funnel, 100 mlmeasuring cylinder, retort stand with clamp.Instruction1. Pour 100 ml water and oil mixture into a beaker. Record your observation.2. Pour the mixture into a separating funnel (Figure 6.25).3. Separate the water and oil using … Read more
Activity 6.7:Aim: To separate a mixture using sedimentation methodMaterials and apparatus: Silty solution, two 100 ml beakers, glass rodInstruction1. Pour 50 ml of silty solution into a 100 ml beaker.2. Stir the silty solution by using a glass rod. (Figure 6.24 (a)).3. Observe the water and silt after a while.4. Slowly, pour the clear water … Read more
Activity 6.6:Aim: To separate a mixture using magnet.Materials and apparatus: Mixture of iron and sulphur powder, spatula, Petri dish, magnet bar, paper.Instruction1. Put one spatula of iron powder and sulphur powder into a Petri dish.2. Hold a magnet bar near the mixture (Figure 6.23).Questions1. Which powder will be attracted to the magnet?2. Is the powder … Read more
Activity 6.5:Aim: To separate a mixture using distillation method.Apparatus and Materials: Mixture of water and alcohol, porcelain chips, thermometer, tripod stand, Bunsen burner, wire gauze, Liebig condenser, retort stand with clamp, round-bottom flask, beaker.Instruction1. Pour the mixture of water and alcohol into the round-bottom flask until it is half full and add in some porcelain … Read more
Activity 6.4:Aim: To separate a mixture using filtration methodMaterials and apparatus: Sand, distilled water, filter paper, filter funnel, two 50 ml beakers, spatula, glass rod, retort stand with clamp.Instruction1. Add two spatulas of sand to 30 ml of water in a beaker.2. Stir the mixture of sand and water for two minutes.3. Filter the mixture … Read more
Question 1:State the subatomic particles. Answer:Proton, electron and neutron Question 2:Why is an atom neutral? Answer:The number of electrons in an atom is equal to the number of protons. Thus, an atom is neutral. Question 3:What is meant by element and compound? Answer:An element is made of only one type of atom while a compound … Read more
Experiment 6.2:Problem statement: What are the differences between metals and non-metals?Aim: To study the characteristics of metals and non-metals(I) Appearance of metals and non-metalsHypothesis: Metals have a shiny surfaceVariablesManipulated variable: Type of materialResponding variable: The appearance of the materialConstant variable: Size of materialMaterials and apparatus: Copper rod, carbon rod, sandpaper.Procedure1. Rub the surface of a … Read more