B because 2800 divide by 40 is 20
B a bar magnet has a north and a south pole.
Answer:
21
Explanation:
21 is x because 211211 1 1 1 1 1aghh
Answer: She is incorrect to conclude that the reaction is endothermic.
As in the second trial, the temperature has increased by 20 °C , that means the heat has been released and energy is released in exothermic reactions.
Exothermic reactions: The reactions in which the energy of the products is less than the energy of the reactants, and the excess energy is released as heat.
Endothermic reactions: The reactions in which the energy of the products is more than the energy of the reactants, and the excess energy is absorbed as heat.
Answer:
A
Explanation:
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