Question

Leaves are the food factories of plants. The synthesis of food in plants takes place in leaves. Therefore, all the raw materials (Water, Carbon dioxide and sunlight) must reach there. Water and minerals are transported to the leaves by the vessels which run like pipes throughout the root, the stem, the branches and the leaves. The leaves have a green pigment called chlorophyll which helps leaves to capture light energy from sunlight. This energy is used to synthesise (prepare) food from carbon dioxide and water. This process is termed as ‘Photosynthesis’.

Importance

Precipitation reactions are useful in determining whether a certain element is present in a solution. If a precipitate is formed when a chemical reacts with lead, for example, the presence of lead in water sources could be tested by adding the chemical and monitoring for precipitate formation.

Rules

Rules of Precipitation

Nitrates (NO3–): All are soluble.

Potassium (K+), sodium (Na+), and ammonium (NH4+) salts: All are soluble.

Chlorides (Cl–), bromides (Br–), and iodides (I–): All are soluble except silver (Ag+), lead (II) (Pb2+), and mercury (II) (Hg2+) salts




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