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Melting, freezing, and boiling are _____________ changes. Question 3 options: A. compound
B. molecular
C. isotope
D. physical
E. chemical

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Sansacrasial
Melting, freezing, and boiling are PHYSICAL changes. Reason why, you can SEE their PHYSICAL appearance change. Melting, you can see a solid (ice) melt, and turn into a liquid (that's a physical change). Freezing, is when a liquid (possibly water) becomes a solid. It's features change, thus it's a physical change. Boiling, when something is boiled you can see it physically BUBBLE. It heats up, and you can see steam escape from it. This is a physical change, but when you turn it off, the water goes back to normal. But not exactly. When you boil water, you're cleaning and purifying the water. So it become purified drinking water. Also just a tip, when boiling water, make sure the temperature is above 185° F (85° C) so it'll be able to kill all bacteria.
(I wrote this myself, it's my work.) 
Good luck with your studies, hope this helps!! ^-^

To solve the problem we must know about Melting, freezing, and boiling.

What is Melting?

Melting is the process by which a solid is converted to liquid.

What is Freezing?

Freezing is the process by which a liquid is converted to solid.

What is boiling?

Boiling is the vaporization of a liquid when it reaches its boiling temperature.

Now, as we know when there is a change in the phase of a substance, only the physical changes occur in that substance. For example, water when frozen, forms ice although there is a phase change the properties of the water are still the same, still, it will conduct electricity, etc.

Hence, Melting, freezing, and boiling are physical(phase) changes.

Learn more about Melting, freezing, and boiling:

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