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Why u think C to be correct choice?http://onlineexamhelp.com/wp-content/uploads/2014/08/9701_s14_qp_11.pdf
Question 3.......Help please!!!!!!!! The Ans is D
My doubt is why cant the answer be C????
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Why u think C to be correct choice?http://onlineexamhelp.com/wp-content/uploads/2014/08/9701_s14_qp_11.pdf
Question 3.......Help please!!!!!!!! The Ans is D
My doubt is why cant the answer be C????
Lol thank you
(65 x 3 + 63 x 7) / 10 you divide by the total abundance, not 100
In your working, you should have wrongly used 100 as the dominator rather than 10.
I thought the same! But apparently you're meant to consider SO3 formed and not SO2Please help! O/N 2005 p1 question 12
One mole of magnesium, aluminium, and sulphur are each completely burnt in an excess of oxygen gas. Which graph shows the moles of oxygen used in each case?
Answer is D but when i worked the equations out, I got
Mg + 1/2 O2 -> MgO
Al + 3/4 O2 -> 1/2 Al2O3
S + O2 -> SO2
And i noticed that there is a difference of 0.25 between each so i assumed it's a direct proportion hence my answer was A ( a lineat graph). However the answer is D. Please help!
In your working, you should have wrongly used 100 as the dominator rather than 10.
Usually we use 100 as the Abundance right? then why in this case we have to use 10? Can you pls clarify it further(65 x 3 + 63 x 7) / 10 you divide by the total abundance, not 100
As its also having 2 as its value and only sign differenceWhy u think C to be correct choice?
no shazmina its the addition of 3+7 as the denominator also we use 100 when npercentages are givenUsually we use 100 as the Abundance right? then why in this case we have to use 10? Can you pls clarify it further
Ohkayyyyyyyyyyyno shazmina its the addition of 3+7 as the denominator also we use 100 when npercentages are given
Amount of heat produced = 80 * 1000 * 4.18 = 334000Jhttp://onlineexamhelp.com/wp-content/uploads/2014/08/9701_s14_qp_13.pdf
Question 24, help please..... The Ans is B
Why is the ans isnt C?
Thank you so muchAmount of heat produced = 80 * 1000 * 4.18 = 334000J
Based on energy per mole information given, you can find the number of moles of each fuel.
For methane, it's 334000/890000 = 0.375, and for methanol it comes to 0.468
Obviously, since there is lesser moles of methane, it will produce less carbon dioxide.
U still want explanation? I slept just 10 mins before u've asked ...Can you explain these:
40 Fats and grease that build up on pans used in cooking are esters. Pans which are dirty from fats
or grease may be cleaned by heating them with a reagent that will react with the ester group.
What may be used to clean such pans by this reaction?
1 vinegar - aqueous ethanoic acid, CH3CO2H
2 alcohol - ethanol, C2H5OH
3 baking powder - sodium hydrogencarbonate, NaHCO3
Naa.chemistry bhaar nai jaeyU still want explanation? I slept just 10 mins before u've asked ...
yes, it reacts with water to give SiO2 - off white ppt.Guyx does SiCl4 produce a precipitate upon dissolving in water?
hw was the paper?Naa.chemistry bhaar nai jaey
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