Question

What are the characteristics of a substance in the liquid state?

Answer 1

Answer: Made up of particles packed relatively close together, having an indefinite shape but a definite volume

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Start by thinking about how you know a liquid works. For example, think about water. Water you can pour into a cup and it takes the shape of that cup. Pour into a bowl and it takes the shape of the bowl. That means it, unlike a solid, doesn't have a definite shape/has an indefinite shape. You can rule out the first choice.

Also notice that water must have a definite volume. You can't have more water in the cup one second, and less the next second. The volume/space it takes up remains the same. This is unlike a gas, which can spread out or be compressed. That means you can eliminate the last two choices, making B the correct answer.

Chemically speaking, the particles of liquids are close together, but not packed tightly as in a solid (see picture). The electrons and protons make up the atom, but are microscopic. 

Answer 2

Made up of particles packed relatively close together, having an indefinite shape but a definite volume