Doc Al said:To melt that lead mass you'll need to do two things:
(1) Increase the temperature to the melting point of lead. (Hint: specific heat)Find the energy for each step separately and add them.
(2) Melt the lead. (Hint: latent heat of fusion)
Looks OK.physicskillsme said:OK so I have the step 1 part OK?
Heat required to melt a substance = mass X latent heat of fusionHow do I set up part two? Latent heat (fusion) requires a separate equation presumably, I mean different to the Specific Heat in part 1?
I assume that is meant to represent the energy of both steps? If so, the first term is correct for step 2, but the second term has a q where it should have a delta t. I'll rewrite it:So how does this look?
Heat Energy = m X L + m X c X q
Doc Al said:Looks reasonable to me. (Be sure to round off your answer to a sensible number of significant figures.)
Melting is the process by which a solid substance changes into a liquid when heated to its melting point.
The melting point is the temperature at which a solid substance changes into a liquid. It is a unique property of each substance and can be affected by factors such as pressure and impurities.
Latent heat is the amount of energy required for a substance to undergo a change in state without changing its temperature. In the case of melting, the latent heat of fusion is the energy needed to change a solid into a liquid.
Adding heat increases the kinetic energy of the particles in a substance, causing them to vibrate and move more rapidly. When enough heat is added, the particles break free from their fixed positions in the solid and can move around freely, resulting in a liquid state.
No, a substance will not melt at a temperature below its melting point. The melting point is the minimum temperature required for a substance to change from a solid to a liquid, so if the temperature is lower, the substance will remain a solid.