Exercise 3(A) Question 1. Define: (a) Elements Answer: Element is a substance which cannot be broken further into simpler substances and has a definite set of properties. Elements are made up of only one kind of atoms. (b) Compounds Answer: Compounds are pure substances composed of two or more elements in definite proportion by mass and has properties, entirely different from those of its constituents elements. Compound, are made up of different types of atoms combined chemically. Question 2. Give two examples for each of the following: (a) Metals Answer: Iron, silver, gold. (b) Non-metals Answer: Carbon, sulphur, oxygen. (c) Metalloids Answer: Antimony, silicon, boron. (d) Inert gases Answer: Helium, argon, neon. Question 3. Differentiate between: (a) Pure and impure substances Answer: Pure substances — 1. Pure substances have definite composition and definite physical and chemical properties. 2. They ar...
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