Question 1

At 6.22 of the video 'reaction of acids and bases with metals' it is told that "IN GENERAL bases do not react with metals to give salt and hydrogen".Does this mean that generally bases do not react with bases at all or is it that,they do react but do not give salt and hydrogen? If the latter is true then what are those products.-parthiv004

Accepted Answer

*Bases don't react with bases*, but I think you meant _base-metal reactions_. Generally, they don't react, but *zinc* and *aluminum* are the exceptions; the ones who don't play by the rules.

e.g.: Zn reacts with NaOH to form _sodium zincate_ (Na₂ZnO₂), a salt, and hydrogen.
Zn + NaOH ---> Na₂ZnO₂ + H₂

Al reacts with NaOH to form _sodium aluminate_ (NaAlO₂) and hydrogen.
Al + NaOH ---> NaAlO₂ + H₂

Hope this helps. :)
P. S.: I haven't balanced the equations. Too lazy to work my mind. 
And, about base-base reaction: _neutralization_ occurs by the *acid donating electron(s) and the base receiving it*. But in base-base reactions, that can't happen because *both the bases need electron(s) but there's no free electron(s) in the solution*. Hence, no reaction. What physically happens, I don't know. Don't they mix, or something like that is beyond my scope.

Peace.

Question 2

At 4:32, he explains why hydrogen burns with a pop sound but that explanation could hold true for any exothermic reaction. Also, what if we use a wider container and the same amount of reactants? Won't the gas have more space to expand and hence not cause the pop sound when it meets the static air on reaching the mouth of the container?

Accepted Answer

Hii Prachi.
 I really found this question very interesting and was tempted to answer it.

Hydrogen gas burns very easily with oxygen and in the video he explains that hydrogen reacts with oxygen to form this reaction while some other gases like nitrogen, methane etc does t easily burn with oxygen. And the reaction of hydrogen with oxygen is not just exothermic but highly exothermic. If the reactants aren’t mixed in the proper ratio and in a small amount then it can be very dangerous but if you do use the reactants properly then there will only be a pop sound. If we use a wide container then the noise of the sound can be a lil low but still there will be the pop sound because the hydrogen particles are still rushing towards the mouth and colliding with the stationary air particles.

Question 3

5:21 what is the use of a matchstick then?

Accepted Answer

This reply must be a bit late, but they keep a lit matchstick at the opening of the test tube because hydrogen is a reactive gas, and keeping a lit matchstick at the opening of the test tube can help us make sure that it really is hydrogen that is formed in the chemical reaction.

Question 4

at 0:39 they talk about the reactivity series. but why is hydrogen included in the series even though it is a non metal?

Accepted Answer

hydrogen is included since it helps compare the reactivity of metals. the metals placed above hydrogen can displace it from acids like hydrochloric acid

hope this helps!

Question 5

why we called HCl in acid
there is any specific rules are present

Accepted Answer

I guess you wanted to ask that why HCl is called acid and so I am answering the in context to that question. HCl is called an acid because it is having the presence of H+ ions and this what all acids are hailing in common - the presence of H+ ions. All the acids will be having the presence of H+ ions and all the bases will be having the presence OH- ions.

Hope this helps.

Hope this helps.

Course: Class 10 Chemistry (India) > Unit 2

Reaction of acids and bases with metals

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