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Is every speck of this fine chalk powder still composed of the same substance, or has it changed into something else on breaking or grinding? (Page...
Are the units of chalk obtained in this manner considered the smallest units of chalk? (Page 100)
Do gases also have a fixed volume? (Page 105)
Sugar and sand are both solids. Why does sugar dissolve in water, but sand does not? (Page 108)
When spilled on the table, milk in a glass tumbler flows and spreads out, but the glass tumbler stays in the same shape. Justify this statement.
Represent diagrammatically the changes in the arrangement of particles as ice melts and transforms into water vapour.
Draw a picture representing particles present in the following: (i) Aluminium foil (ii) Glycerin (iii) Methane gas
Observe figure (A), which shows the image of a candle that was just extinguished after burning for some time. Identify the different states of wax in...
Why does the water in the ocean taste salty, even though the salt is not visible? Explain.
Grains of rice and rice flour take the shape of the container when placed in different jars. Are they solids or liquids? Explain.