Physicsfan

I think you need to find the angle that the line joining the two points makes with the x axis. In that case find the tan by: y'-y/x'-x then search the trigonometric tables for the angle

Electrolysis would be the best way to create Hydrogen. Prepare a very dilute solution of common salt in water add the solution to any non conducting vessel and dip two graphite electrodes connected to a 6V battery into the solution. I once tried electrolyzing water using iron electrodes, but i got a green precipitate below the anode, which turned brown after some time. Probably the chlorine ions reacted with the iron anode and formed FeCl2 which reacted with NaOH(Na+ and OH- ions in solution) and formed FeOH2 which got precipitated.Graphite electrodes are quite nonreactive so i bet they would work. The problem is about isolating Hydrogen because Hydrogen may burn again in the presence of O2 to form water again.

Diffusion of water molecules through a semipermeable membrane does not mean a one way flow of water molecules from the region of higher concentration of water molecules(more dilute solution) to a region of lower concentration(less dilute solution). When two solutions of different solute concentrations are separated by a semipermeable membrane,the number water molecules flowing through semipermeable membrane from more dilute solution is greater than the number of water molecules flowing from less dilute region. The reason for flow on both sides is because the water molecules as well as solute molecules hit against the membrane uniformly, but on the side of the less dilute solution, more solute molecules hit the membrane per unit area.On the side of more dilute solution its the other way round.

That would give sulphurous acid not sulphuric acid. passing chlorine through a solution of sulphur dioxide whould give sulphuric acid and hydrochloric acid. If this solution is heated Hydrogen chloride gas will be formed while the sulphuric acid will remain in solution.

Theres something else too NaOH would react again with CaCO3 forming Na2CO3 and Ca(OH)2, because sodium hydroxide is the stronger among the two.right?

[ce]Fe + 2HF -> FeF2 + H2 ^[/ce]

Calcium hydroxide is insoluble. Calcium carbonate is insoluble too. reaction of the above will result in the formation of a coating of calcium carbonate on calcium hydroxide and further reaction will come to a stop. the same thing applies to my solution too.

Just pass Cl2 through the solution and you will get H2SO4. [ce]H2O + Cl2 -> 2HCl + [O] [/ce] [ce] H2SO3 + [O] -> H2SO4[/ce]

How?

how about a reaction of aqueous solution of MgO(insoluble) with Na2CO3(soluble)? this would give MgCO3(insoluble) and Na2O. Na2O reacts with water to give NaOH.

No the body can have only one kinetic energy. Imagine you are standing in a moving compartment with your friend, who has a ball. He throws the ball at you. Now with respect to a an obsever outside, it has a velocity v. But because you are also moving with the compartment, the speed of the ball appears to you as v-speed of train. [imath]K=\frac{1}{2} mv^2[/imath]. the velocities with repect to you and the observer outside are different , so the kinetic energy apparently has different values

Its a solution of ammonia in water. I guess calcium hydroxide reacts with ammonium nitrate to give ammonia?

Why dont they react?

what if the B female was a ZW'?

N2 would have either ZZ or ZZ'. normal female can have can have only one genotype ZW ZZxZW would not give a B female at all in any of the 4 possible outcomes. ZZ'xZW would give only one B female out of 4 outcomes.

both would give the same results,always. how would you do that?

calcium sulphate is insoluble and will precipitate.What remains is a a solution of potassium nitrate. you can crystallise it

Yes. react an aqueous solution of [ce]K2SO4[/ce] with an aqueous solution of [ce]Ca(NO3)2[/ce]. through a double displacement reaction, [ce]K2SO4 + Ca(NO3)2 -> 2KNO3 + CaSO4 v[/ce]

the only way this combination can give such results is that the W chromosome of females also has a recessive allele for trait B, or a dominent allele for normal. notice that any combinations with B females never gives a normal female. Normal females are those which have the dominent allele, and cannot be bred from B females because the recessive allele on W chromosome cannot be replaced. the genotype for a B female can be Z'W' or ZW' in either case im sure the B trait will be expressed because the expression of alleles on Z and W chromosomes are independant of each other.you may wonder about Z'W. im not sure of this either. you probably used pure B females, the ones with recessive allel on W, in the first combination. im not able to find a better idea. do you have a suggestion or more breeding info which i can use? -always glad to be of help to you

that could have been because the male might have been a heterozygous dominant(ZZ'). does the normal male x B female combination always give a B female ?

B is a sex linked character(you might have known this already). By your 1st statement, I can conclude that B is a recessive trait on the Z chromosome(not on the W chromosome because there are B males too). I think you know this already too. If it was dominant then the males would have been B too. this also explains your second and last but one statement because a normal female would have a dominent allele on the Z chromosome. so all the males will have the dominant allele and hence be normal. but if the offspring is a female, it will always have a Z chromosome with recessive allele and so it will be a B female. the third statement is also explained and it will always be true because the cross is between Z'Z' and Z'W.(By Z' i mean recessive allele bearing chromosome). I hope this has been of help.

even after you look up Molarity to your satisfaction:-) , you need to know the gram molecular mass of each compound in your questions. you must be knowing that the mass of one mole of a substance is equal to its molecular weight expressed in grams. so if you take k moles of a substance, its mass would be k times the gram molecular mass. if the number of moles per litre is some number(whole or fraction) k, so now what would be the mass? the after you find that out, you know that that amount would be presen in 1litre, so how much in n litres?

lead nitrate is soluble but lead sulphate and lead carbonate are not soluble. They precipitate in water. I dont know if my reasoning is correct, but according to me an electrovalent compound is insoluble in water when the elctrostatic force between the two ions, exceeds the electrostatic force exerted by the hydrogen and Oxygen ions of water(polar solvent) on the respective ions. according to me , the electrostatic force betwwen the two ions should depend on atomic radii of each ion and the charge.

Hi. Is it possible to determine weather an ionic compound is soluble or insoluble in water using the formula [imath]\frac{1}{4\pi\epsilon} \frac{q_1q_2}{r^2}[/imath] ?