Calculate the atomic mass if cu-63 and cu-65?

Identify the electromagnets with poles that are reversed from the electromagnet shown above

Miner's coal distributors does not mine coal itself, nor does it even store or handle the coal. instead, miner's solicits orders for low sulfur coal from other firms, then purchases the required amount from suppliers and directs them to ship the coal to its customers. what is miner's

How do you know when a chemical reaction has occurred