It's Getting Hot in Here

Question

Water is poured into a beaker and then frozen. In order to monitor the temperature of the water, a small hole is cut into the ice and a thermometer is placed in the hole. The beaker is then placed on a hotplate. Exactly 15 minutes later, the water in the beaker becomes entirely liquid. The diagrams show the beaker when it is first placed on the hotplate and then 15 minutes later.



The graph shows the change in temperature as heat energy is added to the beaker.

The graph is titled 'Temperature of Water as Energy Is Added'. The vertical axis shows temperature increasing and the horizontal axis shows heat energy being added. The plot line starts at the origin, labelled as point A. It shows a sharp rise from point A to point B as energy is added, and it continues to rise until point C. Then as energy is continuously added, it shows no rise until point E. From point E to point F the temperature rises sharply again, and continues to rise thereafter, at the same rate.
Use the drop-down menus to correctly compare the points A and B that are labeled on the graph.

Between points A and B, energy is Query 1
the water and the temperature of the water Query 2
. Additionally, particle motion Query 3
. Points A and B are Query 4
, and so the two points have Query 5
molecular bonds and Query 6
.

Answer 1

Based on the description of the graph and the behavior of water as it heats up and transitions from ice to liquid, here are the appropriate selections for the drop-down menus:

1. Between points A and B, energy is added to the water and the temperature of the water increases.
2. Additionally, particle motion increases.
3. Points A and B are before the phase change (from solid to liquid), and so the two points have different states of matter.
4. The particles in state A (ice) are more closely packed and have stronger molecular bonds than the particles in state B (liquid water).

Let me know if you need more information or help!