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A level Biology: Post your doubts here!
The atrio ventricular valves and the semilunar valves are both closed only there is a high pressure in the ventricles (during ventricular systole) but not high enough to open the semilunar valves and pump blood through the aorta (Between point 1 and 2) AND when the pressure in the ventricle... -
Physics: Post your doubts here!
For q. 26: equation for doppler effect: [Speed of sound X Frequency of source]/[Speed of sound + or - speed of source] so just put in the values and subtract when speed of sound - speed of source (approaching) from speed of sound + speed of source (Receding) ANS= C for q. 25 for the length... -
Chemistry: Post your doubts here!
OHHHH This got me into a trap too! SO basically You have to know that HYDROLYSIS OF ESTERS WITH NAOH ------> SODIUM SALT OF CARBOXYLLIC ACID + THE ALCOHOL so make the equation : CH3CH2COOCH2CH3 + NAOH -------> CH3CH2COONA + CH3CH2OH THEN assume you have one mole of ethyl ethanoate, so you... -
A level Biology: Post your doubts here!
darks and SohaibButt You guys are welcome any time!!:):):) If you have any questions ask me anytime and good luck for your exams(y) -
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Physics: Post your doubts here!
While she jumps and she is in the air, her velocity is decreasing uniformly (as acceleration is = -9.81) and is positive till her velocity is zero. Then she stays in mid air MOMENTARILY with velocity zero and falls with constant acceleration of 9.81 ms-1 in the OPPOSITE DIRECTION. Then as she... -
Chemistry: Post your doubts here!
The Answer for question 6 is D, 536kj mol, I suppose? This is how I got it: 1. Write the equation down: S8 + 8O2 ----------> 8 SO2 2. Write down the bond energies: The Change in heat for the equation is -2376 The left side of the... -
Chemistry: Post your doubts here!
Your answer is correct, but if you look in the Data Booklet, In the Bond Energies section in polyatomic molecules section: there are different values for C double bond C and C Double Bond C in CO2. -
Chemistry: Post your doubts here!
Could anyone help me with this. Looks easy but my results don't match!!!!! 12 Use of the Data Booklet is relevant to this question. This question should be answered using bond enthalpy data. The equation for the complete combustion of methane is given below... -
A level Biology: Post your doubts here!
Water is attracted to lignin in the cell walls of Xylem vessels through 'Adhesion' which means it is attracted to lignin in cell walls of xylem vessels through hydrogen bonds with the help of their cohesive property. Lignin has both hydrophobic and hydrophilic groups in it. hope this helps!:)... -
BIOLOGY CLASSIFIED PAST PAPERS NEEDED URGENTLY
I have physics paper 3 and 1 and chemistry paper 1 and 3 if you want.- Mstudent
- Post #4
- Forum: O-Levels / GCSEs / IGCSE
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BIOLOGY CLASSIFIED PAST PAPERS NEEDED URGENTLY
I attended my bio exam already but thanks anyway. It will help me in my future exams..;)- Mstudent
- Post #3
- Forum: O-Levels / GCSEs / IGCSE
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BIOLOGY CLASSIFIED PAST PAPERS NEEDED URGENTLY
Guys, I've got my school's mid term exams coming and I need the Biology classified past papers urgently. So can you please upload them here.- Mstudent
- Thread
- Replies: 4
- Forum: O-Levels / GCSEs / IGCSE
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BIOLOGY CLASSIFIED PAST PAPERS NEEDED URGENTLY
Guys, I've got my school's mid term exams coming and I need the Biology classified past papers urgently. So can you please upload them here.- Mstudent
- Thread
- Replies: 1
- Forum: O-Levels / GCSEs / IGCSE