Please choose the correct answer to the question: A drain cleaner consists of sodium hydroxide and aluminum. When the drain cleaner is added to water, bubbles of hydrogen are produced, and the solution becomes very hot. Which of these best describes what happens to form the bubbles when the cleaner is added to water? F

Answer1: chemical reaction Answer2: Condensation Answer3: A physical change Answer4: Evaporation

Answer format: answer1/answer2/answer3/answer4
Answer: answer1