Physical and Chemical Changes

force of attraction

energy of attraction

attraction of force

force of gravity

cellulose in wood

soil particles under plant roots

plant stem

barks of wood

potassium

sodium

phosphorus

uranium

heated lightly

heated gently

heated strongly

heated for a long time

melting

freezing

boiling

condensing

chlorine ethenide

ethene chloride

ethene dichloride

ethene trichloride

methane and chlorine

ethene and chlorine

methane, ethene and chlorine

propane, oxygen and chlorine

packed tightly

packed closely

small as compared to that of solids and liquids

far apart

iron

sulphur

both a and b

lead

naphtha

kerosene

diesel

bitumen