7. which state of matter has a definite volume but no definite shape?
liquid
gas
solid

Liquid.

Explanation:

Hello,

In this case, on the attached picture, a graphic scheme of the molecular distribution of solids, liquids and gases is given. In such a way, it is seen that the liquid molecules have a definite volume defined by the amount of molecules and the space they occupy but they do not have a definite shape as solids have, this is due to the fact that they take shape of the container they are in. Therefore the answer is liquid.

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why do the isotopes of a particular element behave differently in nuclear reactions but the same in chemical reactions? chemical reactions involve changes to electrons in an atom; isotopes do not differ in electrons, and so they react the same way during chemical changes.