<span> contain only certain frequencies of light. Each s sublevel is related to a spherical s orbital. ... </span>Bohr model<span>: the electron is a particle; they hydrogen </span>atom<span>has only certain allowable energy states. hope this helps
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Answer:
B) it is endothermic and the temperature decreased
Explanation:
Chemical reactions can be classified as endothermic and exothermic.
Endothermic reactions proceed with the absorption of heat energy (q) and have a positive value for q.
In contrast, Exothermic reactions proceed with the liberation of heat energy (q) and have a negative value for q.
It is given that the value of q = +450 J. Since q is positive, this implies that heat energy is absorbed from the surroundings resulting in a fall in temperature. Hence the reaction is endothermic.
Answer:
E
Explanation:
burning a substance changes it chemically.
