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cuz when u decrease the reactants there will be more temperature decrease ( to be excat double ) 10*2 and not 10/2 .. cuz the rxn is endo ( u can take the concept of the exothermic rxn & apply it to endo .. but one will be temp increase & the other decrease)
I am kinda getting it ...... anyways ... thanks .
Please provide the year and number
Chemistry November 2008 q 15
well this is an endothermic change so the temperature must decrease, this means that we cancel C and D now we have A or B, will the temperature change halve or double if u halved the amount of water, well it will double because when the volume is small the heat will not be as spread around as when the volume is large because when u have a bigger area, the heat will spread throughout the whole of the area causing a lower temperature.
the halides on the top of the group are more reactive than the ones at the bottom. so this question basically asks a displacement reaction of halides.
All the given elements except for proton numbers 10 & 18 can form oxides. This is because elements with proton no. 10 & 18 are stable.. they have a full outer shell of electrons! Therefore, they are unreactive and will not form oxides..
use the periodic table and check the proton numbers on the periodic table, the answer is C because proton number 12 and 14 and 16 are all not noble gases and so they can react, however in the others they have noble gases which dont react.
thank you so much!
thank youoo
i just explained it on the other sticky page but i will explain it again. well as u know sodium is more reactive than hydrogen and so it will produce hydrogen and not the metal but copper is less reactive than hydrogen and so copper will be produced and so we eliminate 3 and 4, now we have either 1 or 2, it is 2 because the metal is always deposited on the cathode which is 2
Please help me with the question below.. how do you solve it?
the percentage of oxygen in the air is 20% and so 30 cm3 will be 20% of the sample of air (as in this reaction only oxygen is used up) and 20/100x=30 then x=150 cm3Please help me with the question below.. how do you solve it?
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