Label each of the following as either a physical process or a chemical process:

Question

Label each of the following as either a physical process or a chemical process: (a) Rusting of metal rod (b) Burning of a paper cup (c) Water charged into ice (d) Water changed into hydrogen and oxygen Given the chemical symbol or name of the following elements. Carry out the following operations and express the answers with the appropriate number of significant figures. (a) 14.3503 + 2.65 (b) 0.0588/0.67 (c) 320.5-(6104.5/2.3) Suggest a method of separating each of the following mixtures into two components: (a) sugar and sand (b) off and water

Explanation / Answer

(1)

(a) Chemical process

(b) Chemical process

(c) Physical process

(d) Chemical process

* A physical process is the one which involves only change in physical state but not in the composition of substance.

* A chemical process is the one which involes chang ein composition of the substance during the process.

(2)

(a) Carbon = C

(b) Zinc = Zn

(c) Oxygen = O

(d) Mg = Magnesium

(3)

(a) 14.3503 + 2.65 = 17.00 ( 4 significant figures)

(b) 0.0588 / 0.677 = 0.0868 ( 3 significant figures)

(c) 320.5 - ( 6104.5 / 2.3 ) = 320.5 - 2.6 * 103 = - 2.3 * 103 ( 2 significant figures)

(4)

(a) Sugar and sand - physical seperation

(b) Oil and water - ditillation

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