Lab- Temperature of the water in the Calorimeter

Questions-

1. Why is it important that the same thermometer be kept in the calorimeter for the entire experiment? (Hint: Suppose that thermometer A reads 1.0 °C low for all readings near room temperature; and suppose that thermometer B reads 1.0 °C high for all readings near room temperature. Would there be a significant error in your value of (t2w - t1w) if you used thermometer A to measure both t2w and t1w? Would there be a significant error in your value of (t2w - t1w) if thermometer B were used to measure t2w and thermometer A were used to measure t1w?)

2. If there were significant amounts of heat lost by radiation from the sample and from the calorimeter to the environment, would this problem cause your measured value of cs to be higher or lower than it should be?

3. If some drops of boiling water were carried over to the calorimeter with the metal sample, would this problem cause your measured value of cs to be higher or lower?