music man

I am writing a lab report from an experiment that requires you to test metal reactions by combining them in cold water, hot water and dilute hydrochloric acid and I am answering questions for the "Discussion" part of the report and one of the questions is "Did any metal(s) not react in your experiments? Which ones? What does this tell you about them? The tin, aluminum and zinc did not react. I am not what this tells me about them. I would appreciate as soon as I can get it. Thanks, Music man