-
We need your support!
We are currently struggling to cover the operational costs of Xtremepapers, as a result we might have to shut this website down. Please donate if we have helped you and help make a difference in other students' lives!
Click here to Donate Now (View Announcement)
Search results
-
P1 MCQ's preparation thread for chemistry ONLY!!!!
nhin...i think not since i have not read it anywhere...I may be wrong. -
P1 MCQ's preparation thread for chemistry ONLY!!!!
when aldehydes are oxidised using acidified KMNO4, carboxylic acids are produced and when oxidised using alkaline KMNO4, salt of carboxylic acids are produced. -
Chemistry and Physics AS paper 12 MCQS
w_07: Q19: yaar optical isomers are those which form mirror images. Out of these options, I,II and III only form mirror images (Try making them...hopefully you'll understand). Q.28: when reduced, aldehydes produce a primary alcohol. also addition of H2 along with nickle catalyst causes the... -
P1 MCQ's preparation thread for chemistry ONLY!!!!
Q.33 In a triple or a double bond, there is only ONE SIGMA BOND, the rest are PI bonds hence option 1 is wrong the pi-bond cannot itself rotate hance the rotation can only take place along the sigma bond axis. since option 2 and 3 are correct, the answer is C. -
P1 MCQ's preparation thread for chemistry ONLY!!!!
Yes since KMNO4 is also used for oxidation :) -
P1 MCQ's preparation thread for chemistry ONLY!!!!
Yes aldehydes are made but you can say that they are the initial products of oxidation of primary alcohol..the final product is carboxylic acid :) -
-
Chemistry and Physics AS paper 12 MCQS
The question says the mass of HYDROGEN ATOMS, we take the mr to be 1 and the mass is 1g which give us 1 mole. Since Ne has mr of 20, and the mass is 20, the moles will be equal to 1. the no of atoms are thus same to that of 1 g of HYDROGEN ATOMS. Hope you understand :) -
P1 MCQ's preparation thread for chemistry ONLY!!!!
The question says the mass of HYDROGEN ATOMS, we take the mr to be 1 and the mass is 1g which give us 1 mole. Since Ne has mr of 20, and the mass is 20, the moles will be equal to 1. the no of atoms are thus same to that of 1 g of HYDROGEN ATOMS. Hope you understand :) -
P1 MCQ's preparation thread for chemistry ONLY!!!!
Primary alcohols are oxidised to aldehyde which is then further oxidised to carboxylic acid so it is a product of oxidation. -
P1 MCQ's preparation thread for chemistry ONLY!!!!
Primary alcohols are oxidised to aldehyde and then carboxylic acid. if you make a displayed formula of the compound, you will see that the OH groups represent a secondary alcohol. Since secondary alcohols are oxidised to ketones and not carboxylic acids, 2 is a wrong option. -
-
A level Biology: Post your doubts here!
I need help with this one too please..and if possible can anyone explain this HORRIBLE graph to me? Thanks in advance :) -
A level Biology: Post your doubts here!
since the bases are complementary, they are in the same ratio.Since 20% bases are cytosine, 20% will be guanine (a total of 40%). the remaining 60% are obviously Adenine and Uracil( since it is mRNA) Adenine and Uracil are complementary to each other and will be in the same ration i.e 30% each... -
-
*Chemistry P1 May/June 2003 Fully Explained*
Excellent effort! But for a second i thought it was May/June 2013 :oops::ROFLMAO: Stay blessed!:) -
AS Physics P1 MCQs Preparation Thread.
Using the formula W=mg, calculate m first. Since we have to calculate the acceleartion down the plane, we use the formula F=ma for which the resultant force has to be calculated first (ie component-frictional force) The value of the resultant force along with the mass obtained eariler are then... -
AS Physics P1 MCQs Preparation Thread.
Let the distance between the double slit and the screen be 1m initally. When the distance is increasd BY 2m the NEW distance is 3m. Using the formula: Wavelength= (fringe seperationx distance between the double slits)/ distance between the screen and the slits. Wavelenght=600nm=600x10^-9m... -