How many calcium ions are in 0.5 mol of cacl2?

How are isotopes of the same chemical element alike? how are they different?

The chemical bond connecting one nucleotide with the next one along the nucleic acid chain is called a

You open a can of soda at room temperature and hear a hiss. which of the following factors has changed inside the container? a.) atmospheric pressure b.) temperature of gas c.) type of gas d.) amount of gas