Question

When a block of metal is heated from 25°C to 150°C, which of the following options accurately describes the changes that occur?

Options:
A) The block of metal expands in size.
B) The block of metal contracts in size.
C) The block of metal remains the same size.
D) The block of metal changes color.
E) The block of metal becomes magnetic.

Answer 1

A block of metal heated from 25°C to 150°C will expand due to thermal expansion.

Step-by-step explanation:

When a block of metal is heated from 25°C to 150°C, the metal expands in size. This is due to thermal expansion, a phenomenon where the kinetic energy of atoms and molecules increases with temperature, causing them to move apart and the material to expand. As for fitting a metal peg into a hole in another metal block, the block should be hotter than the peg during insertion to allow for expansion of the hole and contraction of the peg upon cooling, ensuring a tight fit.