Test: 2nd Grade Science

1.

Will says some changes caused by heating cannot be reversed. Angelo says some changes can be reversed.

Their father takes a popsicle out of the freezer and sets it on the counter. The popsicle begins to melt. He gets a call and puts it back into the freezer.

Using this example who is correct, Will or Angelo, and why?

There is not enough information to decide who is correct.

Will; He is correct because this is a change that cannot be reversed. Once the popsicle has started to melt, there is no changing that.

Neither of the boys is correct.

Angelo; He is correct because this is a change that can be reversed. If the popsicle were melting and put back into the freezer, it would refreeze and become solid again.

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