Things which are lighter than water or less dense than water will not sink in water eg. plastic, wood, and oil.
Question 5
(a) Why do some objects sink into water?
(b) Which of the following substances sink into water?
Stone, sponge, iron nail, metal key and flower.
(c) In a glass tumbler, it was observed from top to bottom – oil→water→honey were present in different layers. What can you tell about the density of honey with respect to water?
Non - magnetic materials: Rubber, wood, plastic Magnetic materials: Steel, iron nails, cobalt.
Question 17
You are provided with the following materials: Turmeric, honey, mustared oil, water, glucose, rice flour, groundnut oil.
Make any three pairs of substances where one substance is soluble in the other and any three pairs of substances where one substance remains insoluble in the other substance.