When glass is formed, which of these takes place first? a) the sand turns to liquid. b) the molecules become hard. c) the sand is heated intensely. do) the molecules become disordered.

I would say D and if that's not it it's A

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The correct answer would be option C) The sand is heated intensely. A would be incorrect because the sand does not just turn into liquid. B would be incorrect because how would the molecules become hard. D is incorrect because this step comes after the heat.

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.

c is the answer because when something is left after something evaporates that shows the chemical change.