Water is made of two hydrogen atoms and one oxygen atom bonded together. julia is describing how water undergoes a physical change when it boils. she says that the particles shift to be farther apart and that the oxygen and hydrogen separate. she also says that the total mass of the steam is the same as the initial water, and that heat energy was required to cause the change. she finishes her description by saying that the steam can be turned back into water if it is cooled.

which is the mistake in her description?

the total mass remains the same in physical changes.
the arrangement of particles may change in physical changes.
atoms remain bonded to each other in physical changes.
energy changes may occur in physical changes.

Option (b) is the correct answer.

Explanation:

Chemical changes are defined as the change which tend to show difference in chemical composition of a substance.

For example, toxicity, reactivity, combustion etc are all chemical properties.

A chemical change will always lead to the formation of a new compound.

On the other hand, a change which is unable to bring any difference in chemical composition of a substance is known as a physical change.

For example, change in shape, size, mass, volume etc are all physical properties.

Like melting of ice changes its state from solid to liquid state. So, it is a physical change.

In a physical change there might occur change in state of matter but there will never occur any change in the arrangement of particles.

Thus, we can conclude that the mistake in Julia's description is the arrangement of particles may change in physical changes.

b) mutualism

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