有2題差唔多類型ge chemistry questions......40點!!*
- 1 decade agoFavorite Answer
liquid to gas is evaporating - add heat
gas to liquid is condensing - withdraw heat
liquid to solid is freezing - withdraw heat
solid to gas is subliming - add heat
oxygen gas is a diatomic molecule.
electrolysis of water changes the water molecules into oxygen gas O2 and hydrogen gas H2. water from liquid state is now in gaseous state of some other compound.
boiling of water doesnt change the molecule of water. it adds kinetic energy to the water molecule.
reverse of boiling is simply condensing.
reverse of electrolysis (synthesis of water) requires high activation energy. the reaction is highly exothermic as O2 and H2 are highly flammable.
it's not really passing through the water but giving water energy to be oxidized at the anode and reduced at the cathode
voltameter measures how much electricity u have in the unit of coulomb. voltmeter measures the electric potential in the unit of volt
iii water soluable salt
copper carbonate has ionic bonds and simply requires heat to neutralize those attractive forces. water is covalent bonding and heating only breaks the intermolecular forces. to decompose it, it requires the separation by charges. covalent cond is stronger than ionic bonds.
8 and 9 no idea