Biology; Chemistry; Physics: Post your doubts here!

[legion]

how do we know if an element is going to melt or sublime?
n what is the conversion of gas directly into solid form called?

 

[hassan100]

????
Well what do u mean by the bold words above !
Metal oxides act as bases while non metals act as acids and only amphoteric oxides act as both so it wud be better !

dude i am answering his question""should they be an oxide of metal" however u r yte on the point that metal oxides are basic and non metal are acidic oxides

 

[hassan100]

how do we know if an element is going to melt or sublime?
n what is the conversion of gas directly into solid form called?

Actually there are some substance like iodine, ammonium chloride etc which can sublime while all others can only melt.Therefore u need to know the chemical substance is a sublimate or not.
To the second question the process which converts gas into solid directly is called solidification!!

Hope this help!!

 

[legion]

Actually there are some substance like iodine, ammonium chloride etc which can sublime while all others can only melt.Therefore u need to know the chemical substance is a sublimate or not.
To the second question the process which converts gas into solid directly is called solidification!!

Hope this help!!

it sure did. thnkuuu

 

[legion]

http://www.xtremepapers.com/revision/gcse/chemistry/stoichiometry.php
umm in the explanation of neutralization reaction here, there are two equations given. one has the products salt n water. other has salt, water n carbon dioxide gas.can any1 tell me wht are the different circumstances? in both cases bases have reacted with acids.
help plzzzz??? n soon
thanku

 

[CaptainDanger]

http://www.xtremepapers.com/revision/gcse/chemistry/stoichiometry.php
umm in the explanation of neutralization reaction here, there are two equations given. one has the products salt n water. other has salt, water n carbon dioxide gas.can any1 tell me wht are the different circumstances? in both cases bases have reacted with acids.
help plzzzz??? n soon
thanku

There is CARBONATE in the 2nd one... Extra carbon releases CO2...

 

[legion]

so wherever carbonates react with acid they form salt, water and CO2?
is this reaction correct? HCl + CaCO3 > H2CO3 + H2O + CO2

btw, thanku

 

[SalmanPakRocks]

so wherever carbonates react with acid they form salt, water and CO2?
is this reaction correct? HCl + CaCO3 > H2CO3 + H2O + CO2

btw, thanku

hmmm i think not, where did the Cl go?

 

[legion]

hmmm i think not, where did the Cl go?

opppsss yea ryt
so wht are the reactants of reaction b/w HCl and marble chips?

 

[Silent Hunter]

for calcium corbonate and Hcl

this would be correct reaction i think :

CaCO3(s) + 2 HCl(aq) → CaCl2(aq) + CO2(g) + H2O(l)

 

[SalmanPakRocks]

so wherever carbonates react with acid they form salt, water and CO2?
is this reaction correct? HCl + CaCO3 > H2CO3 + H2O + CO2

btw, thanku

I think this will be the correct one
2HCL + CaCO3 > CaCl2 + H2O + CO2

 

[legion]

thankuu

n wht about the CO2 thng? its released in every reaction tht has carbonate reacting??

 

[Silent Hunter]

yes i think so

 

[mintchocolate4567]

heyy,umm are we supposed to memorize the reactivity series?

 

[SalmanPakRocks]

thankuu

n wht about the CO2 thng? its released in every reaction tht has carbonate reacting??

yes it does, when Acid reacts with Bases.

 

[legion]

thanku silent hunter and salmapakrocks...

 

[SalmanPakRocks]

heyy,umm are we supposed to memorize the reactivity series?

ofcourse, an easy way to do it
Playing Potassium
Soccer Sodium
Can Calcuim
Make Magnesium
All Aluminium
Zappy Zinc
I Iron
Love Lead
Hanna Hydrogen
Cuz Copper
She's Silver
Goregous Gold
and platinium.

 

[legion]

heyy,umm are we supposed to memorize the reactivity series?

yea. if u have problem with it, u can use this sentence. please send cats, monkeys and zebras in large high cages. make sure give pedlocks
its the sequence of positive ions.potassium, sodium, calcium, Mg, Al, Zn, Fe, Pb, H, Cu, Hg, Ag, Au, Pd/Pt
n for negative ions, so no crown bears inky horrors.
its sulphate, nitrate, chloride, bromide, iodie, and hydroxide

 

[Silent Hunter]

correct..........

 

[mintchocolate4567]

thanks.