Determine the direction of electron flow and label the anode and the cathode. label each electrode as negative or positive. drag the appropriate labels to their respective targets. reset e − → ← e − cathode (+) anode cathode anode (+)

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.