A chemist determined by measurements that 0.0250 moles of calcium participated in a chemical reaction. Calculate the mass of calcium that participated in the chemical reaction. Be sure your answer has the correct number of significant digits.

In the 1800s, one of the statements in john dalton's atomic theory was that atoms are indivisible. later experimental evidence led to the discovery of subatomic particles such as neutrons, electrons, and protons. what happened to the indivisible atom part of dalton's atomic theory, and why?

Which element is the least metallic between cadmium, silver, zinc, or iron?

What information does a complete ionic equation give that the balanced equation doesn’t show?