Question

A student heats a liquid on a burner. What happens to the portion of liquid that first begins to warm?

Answer 1

For water, as the temperature goes up the density of the liquid water decreases therefore it becomes less dense so it tends to rise upward. And since the temperature here is higher, heat flows from the higher temperature to the lower so it releases energy to the environment. Therefore, the correct statements are 2, 3 and 5.

Answer 2

I sarts creating bubbles a the bottom of the liquid then as the beaker heats up the bubbles start to rise up to the top