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Nataliya [291]
3 years ago
11

Pj likes to ride his bike around the block. If he rides out of his house west, the sidewalk circles his block, and brings him ba

ck to his doorstep 0.35 miles later. Find his distance and displacement.
Chemistry
1 answer:
lesya692 [45]3 years ago
7 0

Answer:

hm

Explanation:

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Answer:

The reaction is exothermic (option 4)

Explanation:

P4 + 5O2 → P4O10 + 712 kcal

In chemical reactions heat can be absorbed or released:

⇒in the first case, when heat is absorbed, this is called an endothermic reaction. The products have more energy than the reactants. The reaction requires or absorbs energy from it's surroundings.  That means  that in this reaction energy , in the form of heat, will be absorbed by the reactants.

⇒ when heat is released, this is called an exothermic reaction. The reactants have more energy than the products. The reaction gives or releases energy to it's surroundings.  That means  that in this reaction energy , in the form of heat, will be released by the reactants.

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We notice that on the right side, which is the product side, there is a positive amount of energy. This means that the energy is released by the the reactants, in this reaction. <u>The reaction is exothermic.</u>

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