Physics, Chemistry and Biology: Post your doubts here!

[DANISH182]

I think its Zinc butanoate + hydrogen

yes if an acid reacts with a metal will will give salt +H2
with carbonates=salt+CO2+H2O
with hydroxide=salt+H2O

 

[misscute406]

need help guys!! 0620/33/m/j/14...question 3(b) Kindly explain!! not able to upload the pikcha!!

 

[Shandana khan]

9 b only

Thaaank you so very much for your time ....

 

[ThePacifics]

Could anyone explain me this?

Which of these pairs of aqueous ions BOTH react with dilute sulfuric acid to give a visible result?
A. Ba2+ and Cl-
B. Ba2+ and CO3 2-
C.NH4 + and Cl -
D. NH4+ and CO3 2-

 

[DANISH182]

need help guys!! 0620/33/m/j/14...question 3(b) Kindly explain!! not able to upload the pikcha!!

maybe i think this one and the other product is water as it is condensation polymerisation

 

[misscute406]

maybe i think this one and the other product is water as it is condensation polymerisation

thank you so much!!

 

[DANISH182]

thank you so much!!

thnx but i think someone else also should agree with the answer

 

[shingiechingz@8]

need help guys!! 0620/33/m/j/14...question 3(b) Kindly explain!! not able to upload the pikcha!!

I do think that the polymer is in the form of starch so it can be represented like this.

 

[sj0007]

how do we describe
1. the formation of ethanoic acid using acidified KMnO4 (3)
2.the usefulness of chromatography in separating and identifying mixtures(4)

Acidified potassium mangnate is an oxidising agent so just say that add potassium mangnate to ethanol inorder to form ethanoic acid
The usefulness of chromotography just means that u should know that it is used in identifying the colourless substances present in the mixtures by spraying the locating agent onto the chromotogram

 

[DANISH182]

I do think that the polymer is in the form of starch so it can be represented like this.View attachment 53859

yeah so i think mine is correct

 

[Saad the Paki]

Could anyone explain me this?

Which of these pairs of aqueous ions BOTH react with dilute sulfuric acid to give a visible result?
A. Ba2+ and Cl-
B. Ba2+ and CO3 2-
C.NH4 + and Cl -
D. NH4+ and CO3 2-

The answer is B.
Cuz sulfuric acid has 2 ions H+ & SO4-
SO4- will react with Ba2+ to form BaSO4 which can be seen as a white precipitate
And plus any acid with any carbonate gives off carbon dioxide which can be seen as bubbles are formed!

 

[Saad the Paki]

yeah so i think mine is correct

Yup its correct

 

[ThePacifics]

The answer is B.
Cuz sulfuric acid has 2 ions H+ & SO4-
SO4- will react with Ba2+ to form BaSO4 which can be seen as a white precipitate
And plus any acid with any carbonate gives off carbon dioxide which can be seen as bubbles are formed!

Thanks!

 

[DANISH182]

what should be the definition for respiration

 

[sj0007]

what should be the definition for respiration

I think the bio one is the best: it is the chemical reaction that breaks down nutrient molecules in living cells to release energy

 

[shingiechingz@8]

Acidified potassium mangnate is an oxidising agent so just say that add potassium mangnate to ethanol inorder to form ethanoic acid
The usefulness of chromotography just means that u should know that it is used in identifying the colourless substances present in the mixtures by spraying the locating agent onto the chromotogram

how about the equation.........

 

[DANISH182]

Is polymerisation only for alkenes or for alkanes also

 

[Kiara P.]

What is a " binary compound " ?

Is polymerisation only for alkenes or for alkanes also

Only Alkenes.

 

[sj0007]

how about the equation.........

What equation?

 

[DANISH182]

What is a " binary compound " ?



Only Alkenes.

but in our textbook it asks for the name of the polymer of butane!!!!