1) In a chemical reaction: a) the masses of the reactants are always bigger than the masses of the products b) the masses of the reactants are always less than the masses of the products c) the masses of products and reactants are usually the same d) the masses of the products and reactants are always the same 2) If you burn a piece of coal, the mass of the ashes you have left is less than the original mass of the coal because: a) carbon dioxide has been produced, which has escaped into the air b) carbon dioxide has been absorbed into the air c) oxygen has been produced d) water has been absorbed from the air 3) If you heat a piece of copper, its mass goes up because: a) it has reacted with oxygen from the air b) metals expand when they are hot c) heating metals produces carbon dioxide d) mass is conserved 4) In a chemical reaction: a) new atoms are created b) atoms are rearranged to form different substances c) atoms can be destroyed d) different atoms are made

mass questions

by Anonymous
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