Introduction to Chemistry

Question 1:Figure 1 shows several examples of waste substances in the school laboratory.(a) Based on Figure 1, list out wastes that cannot be disposed of into the school sink or the rubbish bin.(b) Explain how to manage the waste substances listed in (a) correctly. Answer:(a) Used gloves, broken conical flask, bromine, concentrated acid(b) Gloves and … Read more

Question 1:Chemicals are substances that cannot be ignored in our daily lives.(a) State five types of chemicals that are commonly used in daily life. (b) For each chemical stated in (a), state its use. Answer:(a) Salt, sugar, paint, preservative, detergent (any other acceptable answers).(b) Salt – as flavouring agent or preservative.Sugar – as flavouring agent … Read more

Question 1:List out three safety steps while in the laboratory. Answer:– Do not play in the laboratory.– Wear protective equipment when carrying out experiments.– Do not bring food or drinks into the laboratory.(any other acceptable answers). Question 2:Give the functions of the following equipment:(a) Fume chamber(b) Safety shower(c) Laboratory coat Answer:(a) A specially designed equipment … Read more

Question 1:What is meant by scientific method? Answer:Scientific method is a systematic method used by scientists and researchers when solving problems in science. Question 2:Why is a scientific method important in chemistry? State your opinion. Answer:Scientific method helps chemists to solve problems through systematic scientific steps. Question 3: You are given a bucket of ice cubes, … Read more

Question 1:What is meant by chemistry? Answer:Chemistry is one of the science fields that studies the structure, properties, composition and interactions of matter. Question 2:List out five types of chemicals used in daily life. Answer:Preservative, vitamin, pesticide, paint, detergent (any other acceptable answers). Question 3:Give one example of development of chemistry in industries. Answer:Technological development … Read more