Which of these physical changes would require the addition of energy

The physical change which would require the addition of energy is boiling a liquid.

Explanation:

Physical changes mostly indicate the change in the state of matter of every element. As physical changes does not affect the chemical properties or composition of the element, the nature of the bonding will be same. But it will undergo a change in the structure and shape or in other words, it will undergo a change in the state of matter.

As it is known that there always occurs an inter conversion between different states due to physical changes. So the inter conversion includes, boiling of liquid to gas, freezing of liquid to solid, condensation, deposition etc.

Among the given options, boiling requires additional energy from the surrounding to break the bonds of the liquid and to convert to gaseous state. Thus, the endothermic reaction or the physical change which would require the addition of energy is boiling a liquid.

some of the qualities most frequently associated with the baroque are grandeur, sensuous richness, drama, vitality, movement, tension, emotional exuberance, and a tendency to blur distinctions between the various arts.

metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

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