Physical Properties Answers

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Liquid plastic is frozen in a physical change that increases its volume. What can be known about the plastic after the change?

Serena is mixing a material into a beaker filled with a liquid. She notices that the material seems to disappear into the liquid. What physical property of the material is Serena most likely observing?

When water (H2O) freezes into ice, some of the properties have changed. What stays the same?

Which scenario is an example of a physical change?

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?