Compare the mass of the magnesium strip from test tube 1 with the initial mass of the same strip measured in task 1, part A. Is the mass the same, or is it different? If it’s different, explain what may have caused the difference. Compare the mass of the zinc strip from test tube 5 with the mass of the same strip measured in task 1, part A. Based on your observations of the metal strip, explain what factors may have added to its mass or caused a decrease in its mass. Which had the greater effect? Explain your reasoning

What evidence can be used to support the fact that oxidation, reduction, or both took place in test tube 5?