Therearetwokindsofchanges—chemicalchangeandphysicalchan...
問題詳情：Therearetwokindsofchanges—chemicalchangeandphysicalchange.Inachemicalchange,thereisalwaysanewsubstance(物質)formed.Breakingupwaterintohydrogen(*氣)andoxygen(氧氣)isachemicalchange.Ineachofthe...