Refer back to the camp fire scene in the interactive where the wood is burning. Click on the wood log to be able to play this scenario. Is this an example of a chemical or physical change? What is one property it has? How do you know? Use evidence from the interactive and the Chemical Changes document to support your answer.

because natural gas is colorless, odorless, and tasteless, distributors add mercaptan (a chemical that smells like sulfur) to give natural gas a distinct unpleasant odor (it smells like rotten eggs). they locate the types of rock that are likely to contain natural gas deposits.

that's what i got you can count the number of atoms