When an atom has an equal number of electrons and protons, it has an equal number of negative electric charges (the electrons) and positive electric charges (the protons). The total electric charge of the atom is therefore zero and the atom is said to be neutral
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The equation MgO + 2HCl → MgCl₂ + H₂O is a balanced equation.
- A balanced chemical equation contains equal number of atoms on both sides of the equation.
- The equation is MgO + 2HCl → MgCl₂ + H₂O which contains 1 atom of Mg, 2 atoms of chlorine, 2 atoms of chlorine, 1 atom of oxygen on both reactants and products sides.
- So the equation is balanced.
- An equation for a chemical reaction is said to be balanced if both the reactants and the products have the same number of atoms and total charge for each component of the reaction.
- In other words, both sides of the reaction have equal amounts of mass and charge.
- It follows law of conservation of mass.
- Mass is neither created nor destroyed rather it can be transferred from one form to another.
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Chemistry is the branch of science that deals with the identification of the substances of which matter is composed.
Answer:
CO32−
Explanation:
We have to consider the valencies of the polyatomic ions involved. Recall that it is only a polyatomic ion with a valency of -2 that can form a compound which requires two sodium ions.
When we look closely at the options, we will realize that among all the options, only CO32− has a valency of -2, hence it must be the required answer. In order to be double sure, we put down the ionic reaction equation as follows;
2Na^+(aq) + CO3^2-(aq) ---------> Na2CO3(aq)
