CHEMISTRY [1 Mark Question Answer]

Water molecules in loose chemical combination with other substances. - Water of crystallization

A property due to which a substance absorbs water without dissolving hygroscopic.

A substance which does not contain water anhydrous substances.

The change of states of water from one form to another water cycle.

The harmful substances dissolved in water impurities.

Water fit for human consumption potable water.

Water boils at a lower temperature in the hills, where the atmospheric pressure is lower than in the plains. This is why it takes a longer time to cook in hilly regions.

Water pipes bursts in severe winter because the water inside I the pipes freezes and increases its volume.

Water has high specific heat. Water neither heats up nor cools down quickly. This property makes water an excellent cooling agent.

The boiling point of water increases with an increase, in pressure.

Acetone, ethanol, turpentive

Milk, blood, smoke, jellies, butter, ink etc.

A solution that contains more solute than it can hold at room temperature is called supersaturated solution.

A solution that cannot dissolve any more of the solute at a given temperature is called a saturated solution.

A solution in which more of the solute can be dissolved at a given temperature is called an unsaturated solution.

“A homogeneous mixture of two or more substances can be varied is called a solution”.

Carbon dioxide

Hydrogen

Oxygen

Water gas

Carbonated drinks are bottled under high pressure because the solubility of carbon dioxide increases with pressure.

Ice bergs float in ocean water because density of ice is less than water.

Alcohol is mixed with the water used in car radiators to prevent it from freezing ki cold weather. Because it lowers the freezing point of water.

Water obtained from various sources does not easily form a lather with soap, rather it forms a white sticky scum or a precipitate. This water is called hard water.