Recent content by leah3000

Ok so i understand that part, but won't the density still fluctuate more or less once the mass or volume is altered? I guess I'm confused a bit because both mass and volume are extensive properties...so why is density intensive?

How is density an intensive property? If density= mass/ volume wouldn't the density increase as the mass increases seeing that they are directly proportional? I'm seeing this in my Uni lecture slides on thermodynamics; that density is an intensive property which means it is mass...

Homework Statement A gas expands in volume from 26.7mL to 89.3mL at constant temperature. Calculate the work done (in joule) if the gas expands: i) against a vacuum ii) against constant pressure of 1.5atm iii) against a constant pressure of 2.8 Homework Equations w= -PdV gas...

thank you...that clears it up!

H = U+ pV pV = nRT H= U+ nRT H= H (T) I don't understand the transition from U+ nRT to H (T) Can someone explain this? I get that H = U + pV But how is H= U+ nR

oops. thanks for the help

Homework Statement An aqueous solution containing 1.728g of an impure mixture was analysed for barium ions by adding sufficient sulphuric acid solution to completely precipitate the barium ions as its sulphate. The precipitate was filtered, washed and dried to constant mass and finally...

can anyone help me with this?

Homework Statement In point form briefly explain how you would go about recrystallizing a compound very soluble in solvent A at room temperature and sparingly soluble in solven B at the bp of B. The Attempt at a Solution -Add 1g of compound to a conical flask -Add 4ml of solvent B...

thanks you... There's another question based on the answer to the first but I'm not sure i understand what it says How would prepare a 250ml of a .25M solution of sodium carbonate using the sodium carbonate in the quest above. show claclulations. This is what I did. Mass= Molsx Mr...

Homework Statement Determine the concentration in molL^-1 of a solution of sodium carbonate whoch contains 53g of sodium carbonate in 500ml of solution. Calculate the concentration of sodium and carbonate ions in this solution. Homework Equations no of mols= Mass/Mr mols= [ ] x vol...

ok so to calculate the mass of Cl do i still use the no. of mols as 8.58x10^-3? which could then give a mass of 0.305g? Also if i use this mass to calculate the percentage of Cl, wouldn't that give me the percentage in AgCl (24.8%)? So then do i just subtract this from 100 to get the...

Homework Statement 1.046g of the hydrated chloride of a certain metal were dissolved in water and silver chloride was precipitated by the addition of a slight excess of silver nitrate solution. After purification the silver chloride had a mass of 1.231g. Calculate the percentage of chlorine...

Thank you for helping i understand a lot better now:approve:

ok so i understand the effect of the growing north pole (on the right end) of the left coil-->inducing a current in the right coil which in turn produces the north pole (on the left end) to oppose that of the left coil.- as indicated by Lenz's law. what I still don't catch is shutting off the...