1.

Fill in the following blanks with suitable words: (a) In water, the proportion of oxygen and hydrogen is ___ by mass. (b) In a chemical reaction, the sum of the masses of the reactants and the products remains unchanged. This is called ___

Answer»

Fill in the following blanks with suitable words:

(a) In water, the proportion of oxygen and hydrogen is ___ by mass.

(b) In a chemical reaction, the sum of the masses of the reactants and the products remains unchanged. This is called ___



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