1. What is meant by chemical equation ? Explain with the
help of following equations :
CaCO3 +2HCI —— CaCl2 + CO2 + H2O
(i) The important information it conveys.
(ii) Important information it fails to explain.
Answers
CaCO3 + HCl -> CaCl2 + CO2 + H2O
There is one Calcium atom on the left and one Calcium atom on the right so this is balanced.
There is 1 Carbon atom on the left and 1 Carbon atom on the right so this is balanced.
There are 3 Oxygen atoms on the left and 3 Oxygen atoms on the right so this is balanced.
There is 1 hydrogen atom on the left but 2 on the right so this is unbalanced. Therefore we need to balance it by using 2 molecules of HCl:
CaCO3 + 2HCl -> CaCl2 + CO2 + H2O
Lastly we need to check that the chlorine is balanced, and it is as we can see there are now 2 on each side. Therefore this is now a balanced equation.
Whenever we balance an eqaution you have to change the number of molecules used represented by the big numbers before a molecule e.g 2HCl. You cannot change the subscript (small) numbers as this is the number of each element in a molecule, and you would end up making up your own molecule that doesn't make sense! For example you could not do H2Cl!
The easiest way to balance equations is by going through step by step and each time you make a change- check how it affects the rest of the equation.
CaCO3 is a solid ,2HCl and CaCl2
are aqueous solution, while H2O is liquid & CO2 is gas.
And it also convey that when dilute acids react with metallic carbonates and bicarbonates carbon dioxide is produced.
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Answer:
A chemical equation is the symbolic representation of a chemical reaction in the form of symbols and formulae, wherein the reactant entities are given on the left-hand side and the product entities on the right-hand side.
Explanation:
The physical states of the
compounds are not conveyed.
Explanation:
We are given a chemical reaction:
CaCOs+2HCl→ CaCl2+H2O+
CO2(g)
From the above equation, it can be
conveyed that a metal carbonate when
reacted with an acid, produces a salt,
carbon dioxide and water.
And also, the physical states of the
substances are not written in the
equation, which is a must.
The chemical equation for the above
reaction including physical states are:
CaCOs(s)+2HCl(aq.)→CaClz(s)+
H2O(1)+CO2(g)
Hope this will help you!