Explain why:
(a) Boiled or distilled water taste flat.
(b) Ice at 0∘C. has the greater cooling effect than water at 0∘C.
(c) Burns caused by steam are more severe than burns caused by boiling water.
(d) Rainwater does not leave behind concentric rings when boiled.
(e) Air dissolved in water contains a higher proportion of oxygen.
(f) If distilled water is kept in a sealed bottle for a long time, it leaves etchings on the surface of the glass.
Explain why:
(a) Boiled or distilled water taste flat.
(b) Ice at 0∘C. has the greater cooling effect than water at 0∘C.
(c) Burns caused by steam are more severe than burns caused by boiling water.
(d) Rainwater does not leave behind concentric rings when boiled.
(e) Air dissolved in water contains a higher proportion of oxygen.
(f) If distilled water is kept in a sealed bottle for a long time, it leaves etchings on the surface of the glass.
(a) Boiled water tastes flat because boiled water does not contain matter like air, carbon dioxide and other minerals, So the boiled water tastes flat.
(b) Ice at 0∘C. gives more cooling effect than water at 0∘C. because ice at 0∘C. absorbs 336J per gram of energy to melt to 0∘C. water and hence gives more cooling effect.
(c) Burn caused by steam is more severe than burn caused by boiling water because, 1 g of steam contains 2268J more energy than 1 g of boiling water and hence, cause more severe burns. (d) Rainwater does not leave concentric rings when boiled because rain water does not contain dissolved solids, so it does not form concentric rings.
(e) Air dissolved in water contains a higher percentage of oxygen because the solubility of oxygen in water is more than in the air. So, air dissolved in water contains a higher percentage of oxygen.
(f) If distilled water is kept in a sealed bottle for a long time, it leaves etching on the surface of glass because, the substances which are insoluble in water, actually dissolve in minute traces in water. Even when we drink water from a glass, an extremely small amount of glass dissolves in water, so we see the etching on the surface of glass when a long time sealed bottle of distilled water poured into the glass
(a) Boiled water tastes flat because boiled water does not contain matter like air, carbon dioxide and other minerals, So the boiled water tastes flat.
(b) Ice at 0∘C. gives more cooling effect than water at 0∘C. because ice at 0∘C. absorbs 336J per gram of energy to melt to 0∘C. water and hence gives more cooling effect.
(d) Rainwater does not leave concentric rings when boiled because rain water does not contain dissolved solids, so it does not form concentric rings.
(e) Air dissolved in water contains a higher percentage of oxygen because the solubility of oxygen in water is more than in the air. So, air dissolved in water contains a higher percentage of oxygen.
(f) If distilled water is kept in a sealed bottle for a long time, it leaves etching on the surface of glass because, the substances which are insoluble in water, actually dissolve in minute traces in water. Even when we drink water from a glass, an extremely small amount of glass dissolves in water, so we see the etching on the surface of glass when a long time sealed bottle of distilled water poured into the glass
