Define - Physical change? Give an example of a Physical change. Explain why your example is a Physical change. Define - Chemical change? Give an example of a Chemical change. Explain why your example is a Chemical change. Write the word equation for a metal reacting with an acid. Give an example of a metal reacting with an acid. How would you know a reaction was taking place? Write the word equation for a metal reacting with oxygen. Give an example of a metal reacting with oxygen. Explain what should happen to the mass of a metal burned with oxygen. Write the word equation for a metal carbonate reacting with acid. Give an example of a metal carbonate reacting with acid. Describe what happens when a metal carbonate reacts. Name the gas tests for hydrogen, oxygen and the two tests for carbon dioxide Describe how you would test for hydrogen, oxygen and carbon dioxide. Explain how you would know if the tests were positive for hydrogen, oxygen and carbon dioxide