Chemistry: Post your doubts here!

[Robert Flockhart]

Can someone please with Q.3(b)(i)

 

[kungfuPanda]

Hi guys ,Can anyone tell me Is it permissible for rough work that includes underlining statements of questions ,I do that because it helps me understand questions better,So can we do excessive rough work? I mean its not like excessive excessive just like underlining statements or a simple cut when solving an answer here and there.
is it allowed?

 

[My Name]

Hi guys ,Can anyone tell me Is it permissible for rough work that includes underlining statements of questions ,I do that because it helps me understand questions better,So can we do excessive rough work? I mean its not like excessive excessive just like underlining statements or a simple cut when solving an answer here and there.
is it allowed?

Hey
I do the same.I've never been told that it's a bad thing so it's alright.

 

[sharukh45]

help plz
Hydrogen bonding can occur between molecules of methanol, HCHO, and molecules of liquid Y. What could liquid Y be? A. CH3OH B. CH3CHO, C. CH3COCH3 D. CH3CO2CH3

 

[The Godfather]

https://www.xtremepapers.com/community/threads/skype-a-level-math-tuition-paper-1-2-3-6-7.44001/
Please help me.

 

[ali danish]

can anyone explain why benzene does not undergo nucleophillic addition ????

 

[sharukh45]

HELP PLZZZZZZ
Which physical properties are due to hydrogen bonding between water molecules?
1 Water has a higher boiling point than H2S
2 Ice floats on water
3 The H-O-H bond angle in water is approximately 104

 

[Thought blocker]

can anyone explain why benzene does not undergo nucleophillic addition ????

https://www.quora.com/Why-doesnt-Benzene-undergo-addition-reactions

Hope this makes ur thinking crystal clear

 

[ali danish]

https://www.quora.com/Why-doesnt-Benzene-undergo-addition-reactions

Hope this makes ur thinking crystal clear

yep it helped a lot thanks alot

 

[Thought blocker]

yep it helped a lot thanks alot

Anytime

 

[Saad the Paki]

help plz
Hydrogen bonding can occur between molecules of methanol, HCHO, and molecules of liquid Y. What could liquid Y be? A. CH3OH B. CH3CHO, C. CH3COCH3 D. CH3CO2CH3

Ans is A because hydrogen bonding occurs when hydrogen is bonded to a highly electronegativexperienced atom like N,O,F etc. So only a will fulfill that condition.

HELP PLZZZZZZ
Which physical properties are due to hydrogen bonding between water molecules?
1 Water has a higher boiling point than H2S
2 Ice floats on water
3 The H-O-H bond angle in water is approximately 104

1 and 2 are correct. 3 is wrong.
1 is true as H2O has hydrogen bonding which is stronger than Van der walls forces in H2S so it'll have a higher boiling point.
2 is true as ice forms a widely spaced lattice due to hydrogen bonding making it less dense than water (hence ithe floats).
3 is wrong as bond angles are not related to intermolecular forces.

 

[Thought blocker]

notes on organic synthesis?

 

[ronaldokalaveri]

Chemistry a levels ocr active book anyone?

 

[studentagakhan]

7. Use of the Data Booklet is relevant for this question. In an experiment, the burning of 1.45g (0.025mol) of propanone was used to heat 100g of water. The initial temperature of the water was 20.0°C and the final temperature of the water was 78.0°C. Which experimental value for the enthalpy change of combustion for propanone can be calculated from these results? A –1304kJ mol–1 B –970kJ mol–1 C –352kJ mol–1 D –24.2kJ mol

 

[studentagakhan]

X is the oxide of a Period 3 element. X reacts with water to give an acidic solution. A solution is prepared by reacting 0.100g of X with excess water. This solution was neutralised by exactly 25.0cm3 of 0.100moldm–3 sodium hydroxide solution. What could be the identity of X?
A. Al 2O3
B. MgO
C. P4O10
D. SO3

 

[Laibaaa]

Q.25 anyone please reply soonn

 

[Thought blocker]

7. Use of the Data Booklet is relevant for this question. In an experiment, the burning of 1.45g (0.025mol) of propanone was used to heat 100g of water. The initial temperature of the water was 20.0°C and the final temperature of the water was 78.0°C. Which experimental value for the enthalpy change of combustion for propanone can be calculated from these results? A –1304kJ mol–1 B –970kJ mol–1 C –352kJ mol–1 D –24.2kJ mol

B?

 

[Thought blocker]

X is the oxide of a Period 3 element. X reacts with water to give an acidic solution. A solution is prepared by reacting 0.100g of X with excess water. This solution was neutralised by exactly 25.0cm3 of 0.100moldm–3 sodium hydroxide solution. What could be the identity of X?
A. Al 2O3
B. MgO
C. P4O10
D. SO3

D?

 

[Thought blocker]

Q.25 anyone please reply soonn

B?

 

[Lostsoul]

This channel https://www.youtube.com/channel/UCEK2SrrKv7EtO84fVh0DfPg

Every topic in CIE A2, perfectly set in chronological order for your understanding.

You guys should check it out! And Subscribe