狠狠撸

baking soda acetic acid sodium hydrogen carbonate vinegar copper coating iron sulphate copper sulphate displacement reaction chemical change new substance physical change difference basic magnesium hydroxide magnesium oxide magnesium chemical changes symbiotic relationships fungi modes of nutrition parasites insectivorous plants plants nutrition ph calamine soap lactic acid neutralization salts phenolphthalein china rose litmus neutral base acid no new substance irreversible changes reversible changes change in colour change in size change in shape change in state physical properties physical changes exhalation calcium carbonate lime water