Higher chemsitry help

wonder girl

Hi I was wondering if someone would be able to help me with these questions please.
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(edited 2 years ago)

Reply 1

qwert7890

Original post by wonder girl

Hi I was wondering if someone would be able to help me with these questions please.
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Question 7

begin by writing down the equation

2 Na + 0.5 O₂ ===> 1 Na₂O

Now that you know the equation, you can use the stoichiometry to see which one would be left in excess. To do so, calculate the moles of oxygen and sodium.

Reply 2

qwert7890

Original post by wonder girl

Hi I was wondering if someone would be able to help me with these questions please.
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Question 25

This makes use of the Le Chatelier's principle. The system would always try to oppose the change that is made in the system.

We need the Br₂, and by extension the red colour, to fade. This can only happen if more of Br₂ reacts. Which side should we shift the equilibrium according to you?