1) WHAT IS A CHEMICAL CHANGE a) Chemical changes occur when a substance combines with another to form a new substance b) only change the appearance of a substance, not its chemical composition c) PHYSICAL occur when a substance combines with another to form a new substance 2) The iron reacts with water and oxygen to form a) GALVANISATION b) CHANGE c) REACTION d) RUSTING 3) GALVANISATION a) IT IS THE PROCESS OF APPLYING IRON b) IT IS THE PROCESS OF APPLYING A LAYER OF ZINC ON A PIECE OF IRON c) The iron reacts with water and oxygen to form 4) Which of the following is a chemical change? a) Bursting of a fire cracker b) Germination of seed c) Coal formation from buried trees d) All of these 5) How crystal of pure substances are obtained? a) By chromatography b) By crystallization c) By peptization d) By all these methods 6) What is the formula of rust? a) Fe3O3 b) FeO c) Fe2O3 7) The cooking of rice is a physical change. a) TRUE b) FALSE

PHYSICAL AND CHEMICAL CHANGES

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