Question

When doing an experiment with a calorimeter why is important to keep the lid on?

Answer 1

If that is a bomb calorimeter it is important to maintain a constant volume. If it isn't a bomb calorimeter you want to minimize heat transfer out of or into the calorimeter set up.

Answer 2

Melting lead requires 5.91 cal/g. How many joules are required to melt 1.25 lb of lead? (1 lb = 45 g; 1 cal=4.18J)

Answer 3

Convert 1.25 lb to grams.
q = mass Pb x heat fusion = ? cal
Then convert to J.
Post your work if you get stuck.

Answer 4

You will get faster answers if you don't piggy back your question on another. Instead to to the top of the page and click on Post a New Question.