When a compound is broken down in the chemical reaction, its atoms are a. used to form new compound b. destroyed and new atoms are created c. considered exothermic

When a compound is broken down in the chemical reaction, its atoms are used to form new compound.

Option A

Explanation:

In a chemical reaction involving one or more compounds, the atoms in the compounds breaks and bombardment happens to create a new compound. The chemical formula of the new compound comes form its parent compound due to mixing of molecules.

Hence Option B is invalid as atoms are not destroyed to create a new molecule. All chemical reactions are not exothermic hence option C is invalid.

that tool is called an altimeter which measures your altitude which can be used to tell which atmosphere you are currently in, including the stratosphere.

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pythagoras' theorem

square root (-5^2+9^2)

square root (25+81)

square root (106)

angle is tan^-1(9/5)

neg x, pos y