Atoms combine in chemical reactions to form:

Different proportions of oxygen in the various oxides of nitrogen prove the

Pure samples of copper carbonate synthesized in the laboratory and found naturally both contain $51.35 \%$ copper,$38.91 \%$ carbon,and $9.74 \%$ oxygen by weight. This is in accordance with:

Which of the following pairs of compounds does not demonstrate the law of multiple proportions?

Define the Law of Multiple Proportions.

When $2.16 \ g$ of metallic copper is treated with nitric acid,the weight of copper oxide obtained is $2.70 \ g$. In a second experiment,$1.15 \ g$ of copper oxide on reduction gives $0.92 \ g$ of copper. These results illustrate the law of: