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Which statement most accurately describes the Neolithic agricultural revolution?

Which statement best describes this reaction?

  • The reaction of CaO and water is exothermic. A student mixes the two chemicals in a test tube and touches the side of the test tube. Which statement describes the student’s observation? A The test tube becomes hot as heat is released. B The test tube becomes hot as heat is absorbed. C The test tube becomes cold as heat is released. D The test tube becomes cold as heat is absorbed. And: Solutions of lead(II) nitrate and potassium dichromate are mixed. The solution turns cloudy and yellow. Solid yellow particles fall to the bottom of the beaker. Which statement best describes this reaction? A A precipitate formed. B A gas formed. C The reaction is exothermic. D The reaction is endothermic.

  • Answer:

    First is A, second is also A.

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