What is the difference between chemical reactions and nuclear decay rates

Calculate the molar mass of aluminum oxide (al2o3). express your answer to four significant figures.

Consider the four elements above. which one of these elements will combine with oxygen in a 1: 1 ratio?

When the chemicals iron sulfide (fes) and hydrochloric acid (hcl) are combined, bubbles appear from the mixture. 1. does the appearance of bubbles indicate a physical or chemical change? 2. why do the bubbles indicate this change? 3. what property is this?