In certain fireworks, potassium nitrate breaks down into potassium oxide, nitrogen, and oxygen. this is an example of a reaction. the opposite process is a reaction.
options for both of the blanks are
a) combustion
b) decomposition
c) replacement
or d) synthesis

In certain fireworks, potassium nitrate breaks down into potassium oxide, nitrogen, and oxygen. This is an example of a "Decomposition reaction". The opposite process is a "Synthesis" reaction.

In short, fill your blanks as:
1st blank  → Option B
2nd blank → Option D

Hope this helps!

Answer : The correct option for 1st blank is Decomposition and for 2nd blank is Synthesis.

Explanation :

Decomposition reaction : This reaction occurs when one bigger molecule decomposes into two or more smaller molecules.Synthesis reaction : This reaction occurs when two or more smaller reactants combine to form a single large product.Combustion reaction : This reaction occurs when a hydrocarbon molecule react with the oxygen molecule to produce carbon dioxide and water.Replacement reaction : This reaction occurs when the more reactive element replaces the less reactive element in a compound.

When potassium nitrate breaks down into potassium oxide, nitrogen, and oxygen that means one bigger molecule decomposes into two or more smaller molecules. So, this an example of a decomposition reaction.

And in the opposite process that means potassium oxide, nitrogen, and oxygen are combined to form potassium nitrate means two or more small reactant combine to form a single large product. So, this an example of synthesis reaction.

An  atom  (ours, not carroll's) consists of a positively charged  nucleus, surrounded by one or more negatively charged particles called  electrons. the positive charges equal the negative charges, so the atom has no overall charge; it is electrically neutral. most of an atom's mass is in its nucleus; the mass of an electron is only 1/1836 the mass of the lightest nucleus, that of hydrogen. although the nucleus is heavy, it is quite small compared with the overall size of an atom. the radius of a typical atom is around 0.1 to 0.25 nanometres (nm), whereas the radius of a nucleus is about 10-6  nm.  *  if an atom were enlarged to the size of the earth, its nucleus would be only 200 feet in diameter and could easily rest inside a small football stadium.read more on -

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