Describe how a physical property such as mass and texture, can change without causing a change in the substance

Tin has ten stable isotopes. the heaviest, 124sn, makes up 5.80% of naturally occuring tin atoms. how many atoms of 124sn are present in 82.0 g of naturally occurring tin? what is the total mass of the 124sn atoms in this sample?

Describe the interaction that occurs between two objects with the same electrical charge.

The climate of the continental united states is generally 1. tropical 2. temperate 3. arctic 4. highland