Consider an experiment to investigate the specific heat capacity of iron in the following four questions.
In this experiment, 1759 of iron is always heated up and then added to 75g of room temperature water. The initial
temperature of the iron is
30°C, 40°C, 60°C, or
80°C in each trial. The sample of water always has an initial temperature of 20°C. Multiple trials are run for each initial temperature of the iron sample, and the final temperature of the mixture is recorded. Which of the following options are examples of quantities that were held constant - that is, independent variables that did not vary? Select all that apply.
• The mass of water
• The mass of the iron sample
• The initial temperature of water
• The initial temperature of the iron
• The final temperature of the mixture of water and iron