If the temperature rises in a reaction. Exothermic is if it loses heat.
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There are two hydrogen and two oxygen molecules because the number next to the atomic number is how many there are.
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Answer: Heat causes surrounding air to rapidly expand and vibrate, which creates the pealing thunder we hear a short time after seeing a lightning flash.
<span>B) a cube with a ball stuck on each of its eight corners and one suspended at its center </span>
