Photosynthesis Green plants make food by photosynthesis. Photosynthesis occurs in the leaves of a plant. The green chemical chlorophyll is needed for photosynthesis. Chlorophyll traps light energy and uses it to combine carbon dioxide and water. This forms glucose and oxygen. Leaves have air spaces between their leaves called stomata. The three things needed for… Continue Reading →
Experiment : To determine the percentage of water of crystallization in hydrated sodium carbonate (washing soda). Water of crystallization is the water which is found as part of the structure of a crystalline substance. It has nothing to do with being wet. The water molecules referred to in the term occupy positions in the crystal lattice of the… Continue Reading →
Calcium – A very important mineral which works with Vitamin D to give us strong bones and teeth. It can be easily found in dairy products. Iron – A very important mineral which helps to form haemoglobin in the red blood cells. This is needed to transport oxygen around the… Continue Reading →
1.The sun’s heat evaporates seawater and turns it into a gas called water vapour. 2.The light water vapour rises, cools and condenses into tiny droplets which make up cloud. 3.Further cooling and condensation results in precipitation. 4.Surface run-off(rivers) and soakage returns most of the water to the sea ( some… Continue Reading →
Hard water is any water that forms a scum with soap. Soft water forms lather with soap. Hardness is caused by dissolved calcium and magnesium icons (Ca2+ and Mg2+). Temporary hardness Temporary hardness can be removed by boiling the water. Problems caused by temporary hardness: forms scum (wastes soap), limescale… Continue Reading →
Water treatment plants convert the raw untreated water to consumable water that is available at your home. The stages of water treatment: Sedimentation: Large particles are screened out and smaller particles are left to settle to the bottom of the sedimentation tanks. Flocculation: Aluminium sulphate (which is a flocculating agent) is added… Continue Reading →
