Identify the solutions among the following mixtures. (c) Air

Pragya tested the solubility of three different substances at different temperatures and collected the data as given below (results are given in the following table, as grams of substance dissolved in 100 grams of water to form a saturated solution).

(b) Pragya makes a saturated solution of potassium chloride in water at 353 K and leaves the solution to cool at room temperature. What would she observe as the solution cools? Explain.

Which of the following will show “Tyndall effect”? (b) Milk

Pragya tested the solubility of three different substances at different temperatures and collected the data as given below (results are given in the following table, as grams of substance dissolved in 100 grams of water to form a saturated solution).

(d) What is the effect of change of temperature on the solubility of a salt?

How would you confirm that a colourless liquid given to you is pure water?

Identify the solutions among the following mixtures. (e) Soda water

Classify the following into elements, compounds and mixtures. (l) Carbon dioxide

Classify each of the following as a homogeneous or heterogeneous mixture. soda water, wood, air, soil, vinegar, filtered tea.

Explain the following giving examples. (a) Saturated solution

Which of the following are chemical changes? (e) Digestion of food

Explain the following giving examples. (b) Pure substance

Classify the following into elements, compounds and mixtures. (b) Soil

Which of the following are chemical changes? (f) Freezing of water

Which of the following materials fall in the category of a “pure substance”? (a) Ice

Which separation techniques will you apply for the separation of the following? (b) Ammonium chloride from a mixture containing sodium chloride and ammonium chloride

Which separation techniques will you apply for the separation of the following? (g) Tea leaves from tea

Classify the following into elements, compounds and mixtures. (c) Sugar solution

Explain the following giving examples. (c) Colloid

Which of the following are chemical changes? (b) Rusting of iron

Which of the following materials fall in the category of a “pure substance”? (d) Hydrochloric acid