AS Chemistry- helping each other out!

Original post by C0balt

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can I see the actual question

Reply 2761

xMillnsy

What are the 2 equations when chlorine reacts with sodium hydroxide to make bleach?

Reply 2762

NotoriousS

Original post by shakeyboy

how do you work out the mass number?!?!

((121.3 * 100 ) - ( 60*121)) / 40 = 123

Reply 2763

Anon_98

Original post by C0balt

Btw, I ABSOLUTELY love your handwriting!

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Reply 2764

if anyone need last years jan and june 2014 IAL paper for edexcel send me a message of ur email i ll send it to you as you know tommorw we are doing the R paper as it is roughly the same hardness as international paper

Reply 2765

Original post by shakeyboy

Thank You!

its abundance and m/e mass do you remember

Reply 2766

Original post by xMillnsy

What are the 2 equations when chlorine reacts with sodium hydroxide to make bleach?

2NaOH(aq) + Cl2(g) --> NaOCl(aq) + NaCl(aq) + H2O(l) ...keep in mind that the actual reaction is between OH- and chlorine gas. The sodium ion is a spectator ion. 2OH- + Cl2 --> Cl- + OCl- + H2O
It involves the disproportionation of chlorine to form chlorine with two different oxidation numbers, -1 in Cl- and +1 in OCl-.

Reply 2767

Original post by samwillettsxxx

Yes they do. If it's a positive ion take however many electrons off the config that is the charge
If it's a negative ion add on however many electrons the charge is?

yes you are right

Reply 2768

TeaAndTextbooks

Original post by Joshthemathmo

1. Electrons are being paired in the np orbital for the group 6 element which causes electron pair repulsion such that the ionisation energy is lower due to a lower attraction. Group 5 has no repulsion

2. Group 3 has an electron occupying the np orbital which is higher in energy than the ns orbital so is easier to remove. Lower IE than grp 2

Thank you I just wanted to get the right wording, good luck :yes:

(edited 8 years ago)

Reply 2769

Original post by Shadowfire123

can I see the actual question

Sample of relative atomic mass mass 121.8 was passed through mass spectrometer
It consisted of 60% of 121 and another isotope
What is the mass of the other one
Along that line

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Reply 2770

xMillnsy

Original post by Shadowfire123

Is this the reaction where the NaOH is cold or hot?

Reply 2771

Original post by Anon_98

Btw, I ABSOLUTELY love your handwriting!

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Hahaha thank you :colondollar:

Reply 2772

Original post by C0balt

Sample of relative atomic mass mass 121.8 was passed through mass spectrometer
It consisted of 60% of 121 and another isotope
What is the mass of the other one
Along that line

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thanks its actually a good question never seen like this thanks for your help really appreciated I know I had to do something like wat u did

also why did you do 100-60 is it for the step

(edited 8 years ago)

Reply 2773

Original post by xMillnsy

Is this the reaction where the NaOH is cold or hot?

i dont think there is a difference

Reply 2774

Kitty201322

Hi guys is there a like specification for chemistry and does anyone know all the keywords we need to know i learnt all the ones my teacher said but not sure if he's gave us the whole key term list

Reply 2775

Original post by C0balt

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hi i dont get ur explanation for q 11

Reply 2776

Original post by Shadowfire123

thanks its actually a good question never seen like this thanks for your help really appreciated I know I had to do something like wat u did

also why did you do 100-60 is it for the step

You could just do 40 straight away but I wanted to show how I came up with 40 just in case the person asking didn't get it

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Reply 2777

Original post by Kitty201322

Hi guys is there a like specification for chemistry and does anyone know all the keywords we need to know i learnt all the ones my teacher said but not sure if he's gave us the whole key term list

can you send a picture of the keyword because my teachers dont help us at all

Reply 2778

Original post by C0balt

You could just do 40 straight away but I wanted to show how I came up with 40 just in case the person asking didn't get it

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thanks do you know what paper this is from

Reply 2779