Biology; Chemistry; Physics: Post your doubts here!

[FLRNAB]

So are you saying that if we heat a solution of HNO3 we will die?

But why does its presence not allow us to collect MgSO4?

Why are the other options right?

Yeah you will die if it turns to gaseous state and you inhale it.

In physics we don't take external factors into account like friction, heat loss, resistance etc in some problems which are actually present in real life. Same logic here.

 

[Dark Destination]

Yeah you will die if it turns to gaseous state and you inhale it.

In physics we don't take external factors into account like friction, heat loss, resistance etc in some problems which are actually present in real life. Same logic here.

But what gas?
Who said a gas would be given off if you heat an acid? .-.

 

[FLRNAB]

But what gas?
Who said a gas would be given off if you heat an acid? .-.

Boiling point 83 °C (181 °F; 356 K) 68% solution boils at 121 °C (250 °F; 394 K)
Solubility in water Completely miscible
HNO3

 

[Dark Destination]

Boiling point 83 °C (181 °F; 356 K) 68% solution boils at 121 °C (250 °F; 394 K)
Solubility in water Completely miscible
HNO3

What else would be given off? There is no water.

Nitric acid gas. That's a new one.

 

[FLRNAB]

Nitric acid gas. That's a new one.

Woops. Acids are only acids in Aqueous state. HCl in water is Hydrochloric acid else it is Hydrogen Chloride.
So I think Nitric gas?

 

[Dark Destination]

Woops. Acids are only acids in Aqueous state. HCl in water is Hydrochloric acid else it is Hydrogen Chloride.
So I think Nitric gas?

Is it possible to get crystals of Hydrochloric acid? That has ions in solution. What if we crystallize it?

How about Nitrogen Dioxide gas? That dissolves in water to give Nitric acid.

 

[FLRNAB]

Is it possible to get crystals of Hydrochloric acid? That has ions in solution. What if we crystallize it?

How about Nitrogen Dioxide gas? That dissolves in water to give Nitric acid.

Crystals? Freeze it.

"A crystal or crystalline solid is a solid material whose constituent atoms, molecules, or ions are arranged in an ordered pattern".

 

[princess Anu]

Blood from the patient is withdrawn from a artery or vein during dialysis?

 

[Fate0]

Shouldnt it be (A) 0.00 ? The marking scheme says (B) 0.25.


A O
A AA AO
O AO OO

If the first child has OO, then there can be no other child with blood group O.

 

[princess Anu]

Thats not the case. the ratio will still be the same like for the rest of their lives the probability of their children having OO will remain o.25

 

[Fate0]

Thats not the case. the ratio will still be the same like for the rest of their lives the probability of their children having OO will remain o.25

Ah got it Thankyou!

 

[princess Anu]

does the embryo require carbohydrates for respiration ?

 

[exploded diper]

Blood from the patient is withdrawn from a artery or vein during dialysis?

it is taken fromthe artery and pumped in to the vein

 

[exploded diper]

does the whole sperm enter the ovum or only the head or only the nucleus ?

 

[princess Anu]

Only the Nucleus most probably

 

[exploded diper]

Y r u not accepting the curve from Top, ok let me get this straight for U... forget the Q and listen me..
Q : By drawing a line show the movement of Your Thorax (chest), When U Inhale ( Try it by yourself ), it goes like upwards and outwards both ways ...
Ans : Drawing already shown to u.

okay got it.. kindof ... thanks

 

[kirann]

The lead ore one?

the oxidisng and reducing agent one

 

[kirann]

can anybody explain these questions fully

 

[exploded diper]

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can anybody explain these questions fully

the blood is pushed in spurts in the arteries of the leg muscles ( in pulses) hence this creates pressure on the rested muscles causing them to contract so the foot moves every time a pulse is created ..and hence counting the number of times the foot moves in 60 seconds the pulse rate can be found.....

 

[exploded diper]

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can anybody explain these questions fully

when there is an exciting programme his heart beats faster (maybe due to adrenaline rush) causing the blood to pump at even faster rate in the leg muscles and hence his foot moves faster...