When sodium reacts with chlorine, sodium chloride is produced. andrew represented this reaction with this equation:
na + cl2 → 2nacl
the equation is (blank 1) because the number of (blank 2) atoms is (blank 3) on both sides of the arrow.
blank 1
a) balanced
b) not balanced
blank 2
a) chlorine
b) sodium
blank 3
a) equal
b) not equal

Answer;

B) Not Balanced

B) Sodium

B) Not Equal

The equation is not balanced because the number of sodium atoms is not equal on both sides of the arrow.

Explanation;According to the law of conservation of mass, the mass of reactants should always be the same as the mass of the products in a chemical equation. Therefore, the number of atoms of each element in a chemical equation should always be the same on both sides of the equation, that is the side of reactants and side of products.Therefore,any chemical equation requires balancing to ensure that the number of atoms of each element is equal in both sides of the equation. Balancing is a try and error process that ensures that the law of conservation of mass holds.Thus, the balanced chemical equation is;

2Na + Cl2 → 2NaCl