CBSE Class 9 Answered
1 a) State the law of constant prportion taking an example of ammonia and water.
b) define an ion
Asked by rohan | 26 Nov, 2013, 04:30: PM
Expert Answer
Law of constant proportion states that ‘a chemical compound is always made up of the same elements combined together in the fixed proportion by mass’.
Water is composed of hydrogen and oxygen combined together in the ratio 1:8 by weight.
Atomic mass of hydrogen = 2, Atomic mass of oxygen = 16 when they combine, ratio = 2/16 = 1/8 = 1:8. In water (H2O) the ratio of hydrogen to oxygen is 1:8 in which 1g of hydrogen and 8g of oxygen is needed to form the compound (H2O).
Similarly in ammonia, the ratio of nitrogen to hydrogen is 14:3.
Ion: An ion is any atom which loses or gains electron or more than one electron and aquires a positive or negatiive charge.
Answered by Karishma Kapoor | 27 Nov, 2013, 12:55: PM
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