CHEM AND BIO HELP AND TIPS HERE

[Vin]

Stupid school! I'm totally cluless with the Reproduction lesson... We told them we want practicals but they didnt agree -.-   

LOL XD .. we also told our teacher the same .. they never listen !! n they say students learn better by practical experiments   jk

[**1194**]

Oh yeah, how did I forget that ?
It seems like I've begun my pre-exam memory loss
Thanks ~VIN1094~ and Raywin

[Baladya]

Hi, sooo..

Water is added to a test-tube containing dilute sulphuric acid of pH 4.
What could be the pH of the resulting solution?

A) 8
B) 6
C) 4
D) 2

i thought the concentration of the acid doesn't change the pH? :/

6 because Water will increase its ph lil bit. It doesnt neutrilise it, just make it bit more. Its like (7+4)/2

[Baladya]

LOL XD .. we also told our teacher the same .. they never listen !! n they say students learn better by practical experiments   jk

heheh same here xD we wasted a whole class on trying to convince her  


Dude... Our class is like a zoo... all kinds of stuff u can imagine.... Then when this lesson came, believe me man, not a sound   

[Raywin]

Oh yeah, how did I forget that ?
It seems like I've begun my pre-exam memory loss
Thanks ~VIN1094~ and Raywin

No problem.. glad to help..

[Vin]

Hi, sooo..

Water is added to a test-tube containing dilute sulphuric acid of pH 4.
What could be the pH of the resulting solution?

A) 8
B) 6
C) 4
D) 2

i thought the concentration of the acid doesn't change the pH? :/

no man m sure its B. I remember solving lots of questions like this...

Heyy, yeah, the answer is B, because ur diluting the acid and so its pH increases making it more basic..

[Vin]

Oh yeah, how did I forget that ?
It seems like I've begun my pre-exam memory loss
Thanks ~VIN1094~ and Raywin

BEST OF LUCK !! do it well .. .. like they say .. KILL IT !!

[Baladya]

answer should be C .. water is neutral so it doesnt affect the pH so the pH is not altered

no man m sure its B. I remember solving lots of questions like this...

[Raywin]

Hi, sooo..

Water is added to a test-tube containing dilute sulphuric acid of pH 4.
What could be the pH of the resulting solution?

A) 8
B) 6
C) 4
D) 2

i thought the concentration of the acid doesn't change the pH? :/

Heyy, yeah, the answer is B, because ur diluting the acid and so its pH increases making it more basic..

[Vin]

no man m sure its B. I remember solving lots of questions like this...

oh ok thanks ..  

How can crystals be obtained from a hot, concentrated solution of a salt?

A by adding cold water
B by cooling and then filtering
C by filtering only
D by filtering and drying the residue

i know ques stupid .. but i was never taught such stuff 

[jellybeans]

oh ok thanks ..  

How can crystals be obtained from a hot, concentrated solution of a salt?

A by adding cold water
B by cooling and then filtering
C by filtering only
D by filtering and drying the residue

i know ques stupid .. but i was never taught such stuff  

B) cooling then filtering
think u have to wait for the solution to evaporate a bit then wait for crystals to form. and filter.

[jellybeans]

6 because Water will increase its ph lil bit. It doesnt neutrilise it, just make it bit more. Its like (7+4)/2

thaaaaanks

[Raywin]

oh ok thanks ..  

How can crystals be obtained from a hot, concentrated solution of a salt?

A by adding cold water
B by cooling and then filtering
C by filtering only
D by filtering and drying the residue

i know ques stupid .. but i was never taught such stuff 

B because crystallization.. u have to cool it, wait for crystals to form and then filter..  

[jellybeans]

wait... so diluting an acid decreases the pH? :/ or does it only apply to how "strong" and "weak" the acid is?

[Vin]

B because crystallization.. u have to cool it, wait for crystals to form and then filter..  

B) cooling then filtering
think u have to wait for the solution to evaporate a bit then wait for crystals to form. and filter.

OH YEA  !! ITS STILL A SOLUTION !! thank you ! i think i need some sleep ! thanks guys