Question

please give solutions of no.3, no.4, &no.5.

Answer 1

4. If A chemical equation in which number of atoms of elements on the reactants and products sides are equal,we call it a balanced chemical equation. Mass can neither be created nor destroyed in a chemical reaction.Hence we have to balance the equation.

5.When acid react with metal,Hydrogen gas will be liberated.For example,
Hcl+Zn------->Zncl+Hz
We can test the presence of hydrogen by bringing a candle to the solution,we could hear a pop out sound,it shows the presence of Hydrogen.


3.It has to be 293K(20°C) or more...



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