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Chemistry: Post your doubts here!
Both phosphorus and sulfur are non-metallic elements that form acidic oxides, and eventually strong acids in water. As for their electronic configurations, Phosphorus is 1s2,2s2,2p6,3s2,3p3 ------> each of the 3 electrons are split into 3px, 3py and 3pz. Hence there are no "paired" electrons... -
Chemistry: Post your doubts here!
For 1, bromoethane from ethanol is a reaction that requires heating an alcohol under reflux, and then distilling off the halogenoalkane. The alcohol being ethanol here and the halogenoalkane formed being bromotethane. The very fact that the halogenoalkane has to be distilled can confirm the... -
Chemistry: Post your doubts here!
The main chain is still 5 carbons long, those extra CH3 groups are considered methyl. The first one is 2-methylpentan-3-one. The second one is 2,2-dimethylpentan-3-one. Structural Isomerism splits up into: 1) Positional isomerism 2) Functional group isomerism 3) Chain Isomerism 1 and 3 would... -
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Chemistry: Post your doubts here!
For Question 6, You need to write the reaction out. Al4C3 + NaOH + H2O --------> NaAlO2 + CxHy Tackle the carbons first, there's 3 carbons on the left, so there should be 3 on the right. This gives you: Al4C3 + NaOH + H2O --------> NaAlO2 + 3CHy There's 4 Al's on the left, so there should be 4... -
Chemistry: Post your doubts here!
Density of ice = 1 gcm^-3 Volume of ice being used = 1 cm^3 Mass of ice being used = 1 gcm^-3 * 1 cm^3 Moles of ice being used = 1 g / 18 g since ice is H2O basically. This gives you 0.0555 moles of ice being used. 1 mole of a gas occupies a volume of 24 dm^3 at 298 K. 0.0555 moles of a gas... -
Chemistry: Post your doubts here!
N2O4 <--> 2NO2 at equilibrium. Initially, there is 1 mol of N2O4. NO2 is yet to be formed. When N2O4 dissociates, it gives 2 moles of NO2. 1:2 But it says in the question only 50% dissociates. so 0.5 remains N2O4, and 0.5 dissociates. This gives 1 mol of NO2 for every o.5 moles of N2O4. 0.5:1... -
Physics: Post your doubts here!
No no no no....... You're misunderstanding the concept of resultant forces and what the question is asking of you. A resultant force does NOT require the weight to be balanced in THIS question. They did not mention anything besides the mass. They did not mention where the object is, what... -
Physics: Post your doubts here!
Not sure if you want the whole of question 1, but I'll just explain the first part for now. For part (a), The Young's modulus of a metal wire is 1.8 × 10^11 Pa Young's modulus is defined as stress/ strain. You're given the strain which is 8.2 × 10^–4. They want the stress, in giga pascals... -
Physics: Post your doubts here!
The question is about diffraction gratings, so you need to recall the formula d sin theta = n lambda d is the slit separation, which in this question it is 2.00 micrometers giving 2.00 x 10^-6 meters. sin theta is what you're going to use to find the angle between the orders. n = order number... -
Physics: Post your doubts here!
No. It's not necessary for the weight to be balanced. The object could be on a slope for all you know with a force acting on or at it. If the weight is balanced, the body is in equilibrium, the resultant force would be zero, but that is clearly not the case here. Balanced forces do not give a... -
Physics: Post your doubts here!
The resultant force is what its name indicates. It is the result of a difference between two forces and the directions in which they act. It can be a little confusing since they did not shed light on how they got the resultant force but the fact of the matter is, adding a resultant force to one... -
Physics: Post your doubts here!
It's a tricky question in that you need to understand how orders behave around the central maxima. A diffraction grating with 500 lines per mm, with light of wavelength 600 nm passing through it. For diffraction gratings, there are two formulas you always need to known. The first being: d sin... -
Physics: Post your doubts here!
In this question, you have two unknowns. The slit separation and the distance between the slits and the screen. This allows you to set up two equations, so that when you find one of the unknowns, you may find the other. The main thing to focus on, is considering the initial and final values of... -
Physics: Post your doubts here!
No, you cannot just subtract the distance like that. Look carefully, you took 100 cm which is the bottom of the ball, and subtracted 79 which is the top of the ball. It does not work like that. The interval for which the photograph is taken, is either from the bottom of the first ball to the... -
Physics: Post your doubts here!
The wavelength is 60 cm, but the tube length is 45 cm. 45 cm is 3/4th of 60 cm. Which means that it is 3/4th the wavelength. Where I put "AN", you're supposed to write A. ------------- As the frequency is decreased, the wavelength will increase, because v = f(lambda). Right now the wavelength... -
Mathematics: Post your doubts here!
You need two times. The first of which elapses for the ball falling in air before it reaches the liquids surface. The second of which elapses as it falls through the liquid. The ball starts from rest, so u = 0. For the first part the acceleration is +9.8 ms^-2, since we're considering down to... -
Chemistry: Post your doubts here!
2,4-DNPH is for aldehydes and ketones only, so it will only work for propanal. Sodium will react with alcohols as a metal, but to react with an aldehyde, it'd have to be bonded to cyanide, so as to undergo nucleophilic addition. So it only really reacts with propan-2-ol. Tollens reagent is... -
Chemistry: Post your doubts here!
To begin with, you need to be able to identify what each reagent does.. 2,4-DNPH is used to test for the presence of the C=O double bond that are present in both aldehydes and ketones. If there is one, it will show either an "orange" or "yellow" or "red" precipitate. Which is also why you're... -
Chemistry: Post your doubts here!
For Q3, you're already told that you have a sample containing " isotopes " of mass numbers 35 and 37. On the mass spectrum you're going to end up with different peaks for different combinations of the mass numbers. You can have - Cl-35 and Cl-37, - Cl-35 and Cl-35 - Cl-37 and Cl-37 Which are 3...