Physics, Chemistry and Biology: Post your doubts here!

[My Name]

peolple need a simple difi of phtosynthesis

Difi as in definition?? If that is the case then u have to learn it from the syllabus..........

Here:

Make sure you're definitions are (about) as exact as they have mentioned in the syllabus.

 

[My Name]

HOW TO FIND THE CONCENTRATION OF AMMONIA USING NITRIC ACID AND COMMON LABORATORY APPARATUS?

Is this the complete question and how many marks does it carry?

 

[My Name]

GUYS HOW TO DO THIS QUESTION:View attachment 53312

The answer should always be according to the marks mentioned. Anyway, this is how it goes...
There are three diagrams in the question.The retort stand to fix the beaker of water,the balance to measure the amount of water and thermometer to measure the temperature.

By using the balance has same of both the fuels so that you're test is fair.
First measure the initial temperature of the water using a thermometer.
Fix the beaker of water in the retort stand and place the fuel under it.
Then burn the fuel and record the temperature of water.
Repeate the experiment with the other fuel and the fuel that gives the greatest rise in temperature( for a period of time) produces more energy.
(In other words it would be a better fuel.)

Take a look at the mark scheme to make sure all points have been covered.If you wish to add a diagram you can draw like this(pic below...just that the test tube would be a beaker of water) and write the steps.

Hope that helps

 

[XxChampXx]

For paper 6 design lab, when they say add a 'known volume' of acid into the beaker in the marking scheme, do we mention how much it is in our answer(ex:-10cm3, 20cm3 .etc)

 

[sohaib ul haq]

what are the things needed to score 100% marks in ATP of chemistry when making a bar chart plz reply fast i hav no time left

 

[XxChampXx]

what are the things needed to score 100% marks in ATP of chemistry when making a bar chart plz reply fast i hav no time left

http://www.thamerinternationalschool.com/uploads/files/0620_w09_qp_6.pdf
http://www.thamerinternationalschool.com/uploads/files/0620_w09_ms_6.pdf
Q.4 is a bar chart try checking the marking scheme

 

[My Name]

what are the things needed to score 100% marks in ATP of chemistry when making a bar chart plz reply fast i hav no time left

Read the question.
Label the axis
Take a suitable scale.
Label the the samples or whatever the thing you are trying to show.

I guess that is pretty much it.

 

[sohaib ul haq]

Read the question.
Label the axis
Take a suitable scale.
Label the the samples or whatever the thing you are trying to show.

I guess that is pretty much it.

should there be space b/w bars

 

[My Name]

should there be space b/w bars

When the question says BAR GRAPH then YES,equal spacing between each bar.
But when it comes to Histograms no spaces, though I don't remember making any histograms for chemistry.

 

[My Name]

Intra-cellular enzymes are extracted by filtering the micro-organisms from the feedstock, crushing them, wash them with water then extracting them from the solution
what does dis means and ya my paper 6 went bad in bio does it affect my grades badly

What don't you understand? (Intra cellular enzymes are the ones that are for reactions inside the cell.)
Not badly, InSha Allah because you see P6 is like 20% of Bio.
Don't be sad skyangel,hopefully if you do well in paper 3 and paper 1( which is 80% of bio) it'll be fine.In Sha Allah!

 

[Saad the Paki]

when ammonium chloride is heated why isn't chlorine given off

Lol.. tu rehne de.!

 

[XxChampXx]

Who is doing chemistry paper 62 on Tuesday or before?

 

[Bah...]

Hello y'all
I'm having problems with chemistry paper 6. So I'd really appreciate it if u kindly give me some revision notes...

Thank u in advance

 

[XxChampXx]

Hello y'all
I'm having problems with chemistry paper 6. So I'd really appreciate it if u kindly give me some revision notes...

Thank u in advance

http://www.znotes.ml/
Check the chemistry Paper 6 section

 

[My Name]

Hello y'all
I'm having problems with chemistry paper 6. So I'd really appreciate it if u kindly give me some revision notes...

Thank u in advance

Take a look at these notes (https://www.xtremepapers.com/community/threads/all-things-u-need-to-know-about-chemistry-p6.33395/)
they'll will help you for revision and after revising the things try solving the past papers and time yourself.

 

[skyangel]

What r important chap tht mosty came in paper 3
What is eutrophication I bio

 

[My Name]

What r important chap tht mosty came in paper 3
What is eutrophication I bio

What subject?
Eutrophication is when excess of fertilizers are washed away into rivers and lakes.This leads to more nutrients in those places and further changes in the environment.
( correct me if I'm wrong)

 

[XxChampXx]

What r important chap tht mosty came in paper 3
What is eutrophication I bio

Eutrophication:-
growth of algae/algal bloom ;
light blocked (by algae) ;
reduced/ no, photosynthesis ;
(so) algae/(fixed) water plants, die ;
less / no, oxygen released by plants ;
algae/ plants, fed on/ decayed/ decomposed, by bacteria ;
bacteria, multiply / increase/grow/ divide ;
(aerobic) respiration ;
low levels of oxygen cause, death/ suffocation/ migration, of, (named)
fish/animals / invertebrates /(aquatic) creatures / organisms / consumers
^^This is from a recent marking scheme so if you write points from this you will get full marks

 

[Muaaz Iqbal]

In modifying the experiment?

Naah in Control variable one.

 

[Muaaz Iqbal]

chemistry problem
A question came to draw two straight intersecting lines
You guys are having any idea how to do that