Unit-1
SOME BASIC CONCEPTS OF CHEMISTRY
1. Question based on significant numbers,Precision,Accuracy, ScientificNotation, laws of chemical combinations, SI units
1.1 What are the SI unit of mass, length & time?
1.2 Match the following prefixes with their multiples: Prefixes Multiples (i) micro 106 (ii) deca 109 (iii)mega 10–6 (iv) giga 10–15 (v)femto 10 (vi) pico 10–12 1.3
1.3 What do you mean by significant figures?
1.4 What are rules for determining the number of significant figures?
1.5 (b)Explain the terms: Precision and Accuracy
1.6 Express the following in the scientific notation: (i) 0.0048 (ii) 234,000 (iii) 8008 (iv) 500.0 (v) 6.0012
1.7 How many significant figures are present in the following? (i) 0.0025 (ii) 208 (iii) 5005 (iv) 126,000 (v) 500.0 (vi) 2.0034
1.8 Round up the following upto three significant figures: (i) 34.216 (ii) 10.4107 (iii) 0.04597 (iv) 2808
1. Question based on significant numbers,Precision,Accuracy, ScientificNotation, laws of chemical combinations, SI units
1.1 What are the SI unit of mass, length & time?
1.2 Match the following prefixes with their multiples: Prefixes Multiples (i) micro 106 (ii) deca 109 (iii)mega 10–6 (iv) giga 10–15 (v)femto 10 (vi) pico 10–12 1.3
1.3 What do you mean by significant figures?
1.4 What are rules for determining the number of significant figures?
1.5 (b)Explain the terms: Precision and Accuracy
1.6 Express the following in the scientific notation: (i) 0.0048 (ii) 234,000 (iii) 8008 (iv) 500.0 (v) 6.0012
1.7 How many significant figures are present in the following? (i) 0.0025 (ii) 208 (iii) 5005 (iv) 126,000 (v) 500.0 (vi) 2.0034
1.8 Round up the following upto three significant figures: (i) 34.216 (ii) 10.4107 (iii) 0.04597 (iv) 2808
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