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A group 2 metal, M, is reacted with water so that M + 2H2O --> M(OH)2 + H2. 0.162g of metal produces 97.0cm3 of gas at RTP. Identify M.

1 mole of gas is produces for 1 mole of metal used. n (moles) = volume/24000 ---- This is because 1 mole of a gas occupies 24000cm3 of space, so it's a simple ratio to work out moles(H2). = 97/24000 = 0.0040...
CS
Answered by Cory S. • Chemistry tutor
16822 Views

Explain why the first ionisation energy of strontium is less than the first ionisation energy of calcium

Both of these are alkali-earth elements, this means that both elements have the same amount of outer-shell electrons (2 electrons). Strontium is a row below calcium, meaning it has an additional electron she...
CS
Answered by Cory S. • Chemistry tutor
36369 Views

Explain why xenon has a lower first ionization energy than neon.

Xenon has a bigger atomic radius therefore it experiences more shielding.This results in a decrease in nuclear attraction therefore less energy is required to remove an electron from the outermost energy level.
OI
Answered by Olivia I. • Chemistry tutor
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24.3cm^3 of 0.02moldm-3 KMnO4 reacted with 20cm^3 of iron (II) solution. Calculate the molarity of the iron (II) solution.

Firstly calcuate the moles of KMnO4 by using the equation n=MV/1000 where n=moles M=molarity (moldm -3 ) and V= volume (cm 3 ). As the question gives the molarity and volume of KMnO4 you simply plug the valu...
AB
Answered by Anya B. • Chemistry tutor
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What is a buffer, and how does it respond to the addition of acid or alkali?

Firstly, I would try and establish with the tutee what a buffer is and define it. Going through the key aspects of what a buffer is. The standard definition I have for a buffer is 'A solution that minimises ...
TW
Answered by Tom W. • Chemistry tutor
3310 Views