Biology; Chemistry; Physics: Post your doubts here!

[Spidey21]

yeah....sorry...well if thats so....then

my guess would be B...

plz explain abt this digital indicator cz i never heard abt it in my chem class

and if you see its given in my book atleast that this a probe like thing that you bring in contact with the water and it continously tells you the changes in pH occuring..

 

[Spidey21]

PLZZZZ CAN SOMEONE TELL MEH HOW TO DO PAPER 6 ? HELPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPP!

bio paper 6 right??
dude start solving the pps...if you face any problem share it here..

 

[Spidey21]

Thankyou !! Also can u tell me wether teethscome in paper atp or paper 2

they have nothing to be coming in p4 so theyll be there in p2 and p1 bt dont wory do study teeths before p6 as well...

 

[Vogue]

yeah....sorry...well if thats so....then

my guess would be B...



and if you see its given in my book atleast that this a probe like thing that you bring in contact with the water and it continously tells you the changes in pH occuring..

but my classified says acidic oxide, i.e. option C

 

[Spunkyfarhan]

bio paper 6 right??
dude start solving the pps...if you face any problem share it here..

No chemistry paper 6

 

[Spidey21]

but my classified says acidic oxide, i.e. option C

wait let me have a look at it again...

No chemistry paper 6

there is no chem 6...chem is 4...

 

[Spunkyfarhan]

wait let me have a look at it again...

there is no chem 6...chem is 4...

-_- Alternative to Practical Olevels Igcse

 

[Spidey21]

but my classified says acidic oxide, i.e. option C

umm...yeah it can be ...i am a little confused here..

well yeah its not working as an oxidising Agent as its not applying to the property...neither is it reducing...its Si (non metal ) cannot be a Basic Oxide...so it leaves us with no option but C..

 

[GetSomeLife]

-_- Alternative to Practical Olevels Igcse

It's IGCSE... this is O level

 

[Spidey21]

-_- Alternative to Practical Olevels Igcse

your in the wrong thread i guess...this ones for O levels...GCE O levels..

 

[Spunkyfarhan]

your in the wrong thread i guess...this ones for O levels...GCE O levels..

Thnx Bro!

 

[Vogue]

umm...yeah it can be ...i am a little confused here..

well yeah its not working as an oxidising Agent as its not applying to the property...neither is it reducing...its Si (non metal ) cannot be a Basic Oxide...so it leaves us with no option but C..

dats wat i m confused abt cz i really think it is a reductant cz SiO2 is changing to SiO3 so it shows dat it is oxidising.....in other words isn't it supposed to b a reductant?

 

[Spidey21]

Thnx Bro!

np mate...

 

[Spidey21]

dats wat i m confused abt cz i really think it is a reductant cz SiO2 is changing to SiO3 so it shows dat it is oxidising.....in other words isn't it supposed to b a reductant?

k wait ...let me ask my teacher...

 

[Vogue]

k wait ...let me ask my teacher...

thank u spidey21
i m grateful to u for ur concern nd help

 

[GetSomeLife]

1) what is the useful product wen yeast is used in bread making; is ethanol useful or CO2?
2)What is the function of SiO2(silica) in the equation: CaO+ SiO2= CaSiO3
a) basic oxide b) reducing agent c) acidic oxide d) oxidizing agent

1) It's as Spidey said... ethanol is waste while CO2 is useful
2) It is an acidic oxide which is actually a waste material (SAND) and in order to remove it... the basic oxide CaO is added so they react and form slag (CaSiO3) which floats an can be easily removed. It's also used by road builders

but my classified says acidic oxide, i.e. option C

So i think your classified is pretty much correct

 

[Spidey21]

thank u spidey21
i m grateful to u for ur concern nd help

np...its good for me too...

 

[GetSomeLife]

dats wat i m confused abt cz i really think it is a reductant cz SiO2 is changing to SiO3 so it shows dat it is oxidising.....in other words isn't it supposed to b a reductant?

It is SO not changing into SiO3. If you read the formula again it's CaSiO3 and (as you'll study later) the valency of Si remains the same. It is NOT oxidised

 

[SALT]

bogus.........no actually my prob is tht we just had to answer in yes or no.....so do we consider it negligible or shu we write yes?
heck i kno its 1/1840.........

 

[SALT]

ayeshaK....... place a small amount of sample on the slide, then add a stain (eg iodine solution) to make the contents more visible, den lower the cover slip carefully over the sample...if any bubbles form in the stain then press the slip to remove dem...