Month: July 2018

Question 1:What are the pollutants that can cause haze? Answer:Smoke and dust. Question 2:As a student, how can you increase the awareness of air pollution in the community? Answer:(a) Organise awareness campaign on air pollution.(b) Encourage the habit of recycling among citizens.(c) Listen to talks on the danger of air pollution (accept any suitable answers) … Read more

Question 1:Define combustion. Answer:Combustion is the reaction when a substance is heated with oxygen and releases heat and light energy. Question 2:What are the conditions needed for combustion? Answer:The presence of oxygen, heat and fuel Question 3:Luqman uses a fire blanket to put out a small fire at his house. How does the fire blanket … Read more

Question 1:List the composition of air. Answer:Nitrogen 78%, oxygen 21%, carbon dioxide 0.03%, inert gases and others 0.97% Question 2:How can you identify oxygen and carbon dioxide? Answer:Glowing wooden splinter test for oxygen and lime water test for carbon dioxide. Question 3:What is the importance of carbon dioxide to plants? Answer:Carbon dioxide is used by … Read more

Activity 7.1:Aim: To determine the percentage of oxygen in the airMaterials and apparatus: Candle, plasticine, matches, glass basin, permanent marker pen, gas jar, gas jar stand, water.Instruction1. Prepare the apparatus as shown in Figure 7.2 (a).2. Divide the gas jar into five equal parts (Figure 7.2 (b)).3. Light the candle and invert the gas jar … Read more