Which of the following is soluble in water and which are insoluble in water?
Groundnut oil, Potassium permanganate, Alum, Wax, Sugar, Sand, Petrol, Nitrogen, Oxygen, Copper sulphate, Methane.
Important Questions on Sorting Materials into Groups
Separate the following into natural materials and man-made materials :
Nylon, Water, Coal, Paper, Wood, Wool, Plastic, Glass, Steel, Gold
Name two objects each which can be made from the following materials: (a) Glass (b) Iron (c) Copper (d) Aluminium
Name five objects each which can be made from the following materials :
(a) Wood (b) Cotton (c) Leather (d) Paper
Classify the following into materials having lustre (shine) and those having no lustre (no shine): Gold pendant, Wooden table, Sand, Aluminium sheet, Glass mirror, Sheet of paper, Leather sofa, Brass door handle, Stainless steel tumbler, Jute bag.
Classify the following into transparent, translucent and opaque materials :
Butter paper, Cardboard, Ground glass, Clear glass, Water, Air, Brick wall, Aluminium sheet
Classify the following into hard materials and soft materials: Cotton, Iron, Diamond, Chalk, Wood, Wax, Clay, Sponge, Bone, Feathers
What is the importance of oxygen gas dissolved in water? How is the carbon dioxide gas dissolved in water helpful to the plants which live in water?
