Physics, Chemistry and Biology: Post your doubts here!

[skyangel]

Waves are travelling from a rarer to denser medium. Hence they bend towards the normal.

Can we say thr the wavelenght become shorter

 

[DANISH182]

y

Can we say thr the wavelenght become shorter

yes

 

[DANISH182]

Can we say thr the wavelenght become shorter

wavelenght become shorter speed decrease but frequency stays the same

 

[DANISH182]

Hey can u explain me what is cathodic protectiom

 

[My Name]

Thanks but

Welcome but...?

 

[masterex567]

Hey can u explain me what is cathodic protectiom

it's like when you set up an electrolysis cell with iron and another metal (e.g titanium) as electrodes.
In this way, when iron is the cathode, it gains electrons hence agents of corrosion can't affect it

 

[masterex567]

Welcome but...?

"but i did like dis until time finished" His message got embedded in quote tags.

 

[NOneed2speedd]

Is my structure correct?

 

[qwertypoiu]

Is my structure correct?

Your CH3 are correct. However, the way you joined them to sulfur is wrong.
Whenever there is a covalent bond between two atoms, electrons are shared. Therefore a bond consists of two electrons. Double bonds will consist of 4 bonds, etc. You CANNOT have the C bonding to S with just one electron.
Also remember that Hydrogen has only one electron. Your diagram agrees with this which is good.
Carbon has 4 electrons... But in your diagram each of them has only three!!
Sulphur has six... But yours has eight!
I have drawn the correct diagram without the circles:

 

[NOneed2speedd]

Your CH3 are correct. However, the way you joined them to sulfur is wrong.
Whenever there is a covalent bond between two atoms, electrons are shared. Therefore a bond consists of two electrons. Double bonds will consist of 4 bonds, etc. You CANNOT have the C bonding to S with just one electron.
Also remember that Hydrogen has only one electron. Your diagram agrees with this which is good.
Carbon has 4 electrons... But in your diagram each of them has only three!!
Sulphur has six... But yours has eight!
I have drawn the correct diagram without the circles:
View attachment 53724

thanks very mch for detailed reply
in hurry i put dots b/w carbon and sulphur instead of cross that's y

 

[masterex567]

How to draw ionic diagrams?

 

[Lana19984]

Ju

Just wanted to add a bit more information as ur answer was vague while referring to this.
The ions that are close to the electrodes will ONLY be attracted/repelled to the electrodes. The general flow of ions from cathode to anode is because of diffusion. This happens because of initiall repulsion and attraction causing the ions to have a lower and higher concentration region.

rexplain what u have just said

 

[Lana19984]

A student sets up the apparatus shown. The bulb does not light.
After the student adds substance X to the water, the bulb lights.
What could X be?
A barium sulphate
B carbon (or diamond)
C copper (or graphite)
D potassium sulphate
Q9 2007 oct/nov p1
anyone can explain this please ?

 

[masterex567]

A student sets up the apparatus shown. The bulb does not light.
After the student adds substance X to the water, the bulb lights.
What could X be?
A barium sulphate
B carbon (or diamond)
C copper (or graphite)
D potassium sulphate
Q9 2007 oct/nov p1
anyone can explain this please ?

should be D.
Potassium sulphate is an ionic compound. We know that ionic compounds conduct electricity in molten or aqueous state. when in water, it's in aqueous state and due to the movement of ions it will conduct electricity hence bulb lights.

 

[Lana19984]

should be D.
Potassium sulphate is an ionic compound. We know that ionic compounds conduct electricity in molten or aqueous state. when in water, it's in aqueous state and due to the movement of ions it will conduct electricity hence bulb lights.

what about barium sulphate ?

 

[samermadrid]

I cant understand moles and I don't know where to use the rules

 

[Sariya Khan]

I cant understand moles and I don't know where to use the rules

Can you please post some questions which you find difficult to understand? ..so that I may be able help you.

 

[shingiechingz@8]

what is meant by Avogadro Constant?

 

[Abdurrahmanmuhammed]

And what did you write for how the fertility drugs make women fertile and their social implications ?? i wrote they increase the production of FSH and oestrogen so ovulation occurs and fertilisation may occur ! And for social implications i wrote that women can get cancer if regularly used and they are expensive to buy

getting cancer is not a social implication

 

[shingiechingz@8]

getting cancer is not a social implication

i wrote that the baby can get defects (premature and underweight)