If the specific heat of water is 4.18 J/g⁰C and the specific heat of a rock is 0.418 J/g⁰C, how many grams of rocks at 200⁰C must be added to 100 grams of water to raise the water temperature from 20⁰C to 80⁰C? (Hint: the heat energy gained by water is equal to the heat energy lost by the rocks and both water and rocks have the same final temperature.) (Do not include units, round to the nearest whole number)

they include patterns; cause and effect; scale, proportion, and quantity; systems and system models; energy and matter; structure and function; and stability and change.

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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.