2HgO(s) + 43.4 kcal -> 2Hg(l) + O2(g) This reaction is: Exothermic or Endothermic

The (TRIANGLE)H value is: Positive or negative

Heat is a reactant or product

Which real-world scenarios below represent physical and chemical changes? -running a car -exploding fireworks -mixing water and powdered drink mix -combining oil and vinegar to make salad dressing -taking aspirin for a headache -diluting bleach with water-digesting dinner-spreading peanut butter on bread

1) this is the structure in the cell nucleus that houses a cell's genetic information

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