Biology; Chemistry; Physics: Post your doubts here!

[Zahidiiiii]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Physics (5054)/5054_w13_qp_42.pdf

q : 4 (a)
plz explain and how we have to draw diagrams in these question ?

use a set square placed over the meter rule and place the marble in between the two set squares.
avoid parallex error and take coeresponidng values of diameter on that the setsquare shows on the meter rule and by subtraction u can find the diameter of the marble........ my explanation skills are not good but hope so this may help u

 

[Zahidiiiii]

oh GOd i think no one loves biology or the preparations are quite good,, thats why very less doubts of bio r seen

 

[Awesome12]

oh GOd i think no one loves biology or the preparations are quite good,, thats why very less doubts of bio r seen

Post your doubts if you have any

 

[exploded diper]

to answer this u must know the solubility of salts.
.when AgNO3 reacts with HNO3 Salt form is soluble
when AgNO3 reacts with HCl insoluble salt of AgCl is formed from which we can distinguish the presence of chloride ion..
..

does agno3 reacts with hno3

 

[Zahidiiiii]

Post your doubts if you have any

no doubt preparations at peak only need prayers

 

[Awesome12]

does agno3 reacts with hno3

I don't think so

 

[Awesome12]

no doubt preparations at peak only need prayers

Alright so you also turned out to be a bloke like asadalam

 

[Zahidiiiii]

does agno3 reacts with hno3

in aqeous state ions can disassociate easily.if u react ag no3 with hno3 results will agian b the same

 

[Zahidiiiii]

Alright so you also turned out to be a bloke like asadalam

o nhi bhaiyaayyyyyy..... maray banday an

 

[exploded diper]

View attachment 40891

it just comes naturally......

 

[exploded diper]

in aqeous state ions can disassociate easily.if u react ag no3 with hno3 results will agian b the same

y cant barium chloride be used........
it also does not react with hcl...right?

 

[MiniSacBall]

y cant barium chloride be used........
it also does not react with hcl...right?

What do you actually mean, i mean what exactly is your question?
How can BaCl2 + HCl, react even if they react the results will be the same! Just use your mind for a second. I don't want to discourage you.
But just look at it. What on the earth do you think the combination of these elements could be?

 

[funky brat]

no doubt preparations at peak only need prayers

Uff tauba. Jhootay.

 

[Lilly2318]

In Q numbr 16 the ans is 4cm , can anyone plz explain

 

[Lilly2318]

And can someone plz provide me wid complete notes of extention and load.phy
i need to knw abt the point of origin or something like point of indention (smthing like this ) in topic locomtion. bio

 

[funky brat]

In Q numbr 16 the ans is 4cm , can anyone plz explain

From 0C to 60 degree C, there is a change of 6 cm. Which means for every 10 degrees ther is a change of 1cm. So when the temperature goes down from 0 degree C to -10 degree C, the length of mercury thread will decrease from 5cm to 4cm.

 

[Tuba noor]

Place the sheet of paper on the pin board then place the plane mirror on the sheet.
draw a line with pencil to mark the boundries of the plane mirror.
use a pin. insert from the pointed end itno the sheet and pin board
look with one eye the other closed in the mirror from the other end.
where u see the pin , insert a pin in that place..
then remove the mirror and pins and join the holes in the paper firt striking the miror and then the reflected dot....
draw arow head of the ray.

thanku this is really helpful

 

[FLRNAB]

In Q numbr 16 the ans is 4cm , can anyone plz explain

From 0C to 60 degree C, there is a change of 6 cm. Which means for every 10 degrees ther is a change of 1cm. So when the temperature goes down from 0 degree C to -10 degree C, the length of mercury thread will decrease from 5cm to 4cm.

There is also a formula in my physics book for this:

Upper point Temp = 60
Lower Point Length = 5 cm
Upper Point Length = 11 cm
Temp(c) = -10

 

[The Frozen_nightmare]

Im assuming that the Venier caliber is used to measure diameter and the micrometer screw gauge is used for Thickness, is this correct ? and also when getting the value from the micrometer screw gauge you multiply the micrometer scale by 0.1 ,what is the value you multiply for the vernier scale ?

 

[exploded diper]

What do you actually mean, i mean what exactly is your question?
How can BaCl2 + HCl, react even if they react the results will be the same! Just use your mind for a second. I don't want to discourage you.
But just look at it. What on the earth do you think the combination of these elements could be?

thats exactly what i said.... we say the answer is silver nitrate since it does not react with nitric acid but does react with hcl
so if we use barium chloride it would not react with hcl but would react with nitric acid right?
so y cant we use that as a test?