Physical and Chemical Changes

carbon dioxide and water

carbon dioxide and hydrogen

oxygen and hydrogen

nitrogen and oxygen

pipes

wire cover

tungsten wire

switches

PVCl

PViCl

PVC

PoViCl

weak

strong

rough

soft

Chinese

Indian

American

British

expand more than gases but less than solids

expand more than solids but less than gases

do not expand

none of above

kinetic energy

force of attraction

pressure on atoms

none of these

carbon dioxide

oxygen

hydrogen

nitrogen

carbohydrates

hydrocarbons

alcohols

alkenes

expand more than solids but less than liquids

expand more than liquids but less than solids

do not expand

both b and c