Question

I NEED HELP PLEASE. I DONT UNDERSTAND THESE QUESTIONS AT ALL IN PHYSICS. CAN SOMEONE PLEASE GIVE ME THE ANSWERS?The questions are

1. How much heat is needed to melt 10.0kg of lead at it’s melting point?

2. How much heat is needed to vaporize 10.0 kg of mercury at its boiling point?

3. A temperature of a 0.25 kg sample of copper decreases from 75.0 degrees Celsius to 25.0 degrees Celsius. How much heat flows out of the copper sample?

4. When 8,000 joules of heat are removed from a sample of mercury, the temperature of the sample is decreased from 40 degrees celsius to 15 degrees celsius. what is the mass of the sample?

5. Thermal energy of a substance is the sum of the potential energy and kinetic energy of the particles that make it up. Let’s say you had a hot cup of water and a cold cup of water, then mixed them. Illustrate the behavior of the particles before and after thermal equilibrium is reached

Answer 1

Answer:

1 st one 327 degree is required to melt lead but according to 10 kg its 10 × 327 joules

Answer 2

1. 0.26 × 10 J = 2.6J
2. 2.7 × 10 J = 27J
Sorry but I can only help you this much. Hope it helps