Recent content by atomicblast

CO2 has 2 bonding domains, the lone pairs are on the oxygen atoms and not the central carbon atom. Each double bond counts as one electron domain. No of electron domains = No of atoms bonded to central atom + No of non-bonding pairs on the central atom.

NH4N03 is weakly acidic and partially dissociates because NH4 itself is a weak electrolyte, remembering that NH3 is a weak base. Therefor [c] is also a buffer system.

Whenever it comes to calculating moles, mass, molarity etc. always use units as a guide. What you have now is 13.4g NiCl2, and how to convert from g to moles. From the periodic table, you can calculate the molar mass of NiCl2 to get 1 mol / ?g NiCl2. Also, how many moles of Cl are there in 1...

Some additional notes to help you prepare (try to memorise them!) Bonding domains (BD) - bonded to another atom Non-bonding domains (NBD) - signify lone pairs [2 pairs] Linear - 2 BD, 0 NBD e.g. CO2 [3 pairs] incld lone pairs Trigonal planar - 3 BD, 0 NBD Bent - 2 BD, 1 NBD [4...

It would be [c] because looking at I itself, it has 2 lone pair (4 valence electrons; don't forget the -ve charge on the molecule) and 4 arms sticking out to hold the Cl atoms to it. Don't panic, try to visualise it this way...a piece of square cardboard with the I atom in the middle, 4 Cl...

Basically a 4s orbital is lower in energy as compared to a 3d orbital. This is due to the effective nuclear charge experienced by the electron from the nucleus; the degree to which the electron is able to penetrate the nucleus. Generally due to the rate of penetration and shielding of...

Viscosity is an important characteristic of polymers because it gives an insight to the structure and in turn, the degree of bonding in the structure, and how well the structure is formed. Flow behaviour determines the processibility of the polymer into different products like plastics...

2NaHCO3(s)<-->Na2CO3(s)+H2O(g)+CO2(g) First of all when an equation is given to you, check to see whether it's balance. Equations hold key information like stoichiometric proportions in a reaction. e.g. check to see whether 2 atoms of Na on the left corresponds to 2 atoms of Na on the...

Okie, this is the question given: The apparent absorbance of a solution of a weak acid, HA, was measured at different pH values (you may assume the pH meter was correctly calibrated, that activity coefficients are unity throughout, and that concentrations are reliable. A 1.00cm cell was used...

Other possible errors would be sample contamination, since you mentioned that your results were a little low. Could there be something else present in your sample other than citric acid? The burette could be dirty, thus affecting volume measurements. Reading of burette should be to 2 decimal...

Hi, I've a chem assignment in which I've to calculate the stray light, Ps as a percentage of the incident light, Po. Given the apparent absorbance A(app) 0.047, concentration of the solution 2.00 x 10pwr-6, cell length of 1cm, activity coefficients = 1. I calculated the transmittance to be...