Other Chemistry Answers

What is a Hydrogen bond?

Two students scouring an archaeological site found what appeared to be fossil remains. The specimen was found to have a ratio of 14C/12C 0.795 times that found in current living plants. What would be the estimated age of the fossil remains? The half-life for carbon -14 is 5720 years.

Calculate the number of disintegrations per second that occur in 100 g of radium given that the decay constant is 1.36 x 10−11 radium?

If Fe2+ spontaneously oxidized by the oxygen of the air in acidic solution? Calculate ΔG and K.

Albumin is human protein plasma with a molar mass of 69 000 g mol─1. What would be the osmotic pressure of a solution of this protein containing 2.0 g per 100 mL at 25 C. Assume that the experiment is carried out using a salt solution for solvent and a membrane soluble to the salt.

To dilute an acid with water, acids are added to water and not water to acid because

Acids are more vicourse than water
Water is weaker than acid
Dissolution of acid in water is exothermic which could be explosive
Acids will not dissolve in water if done wrongly

2. A certain reaction is first order with respect to iodide ions.
(a) Sketch a graph to show the variation in concentration of iodine ions (y-axis) with time (t).
(b) Sketch a graph to show the variation of 1/t (y-axis) with concentration of iodide ions.
(c) Explain the shapes of your sketches.

Benzenediazonium chloride and aq. sodium chloride is produced from a reaction of aniline (i.e. phenylamine or aminobenzene) and nitrous acid (produced in situ from 2 mol Hydrochloric acid and sodium nitrate). In the second step, phenol is coupled (at the para position) to the diazonium sal t with the loss of hydrochloric acid, to form a yellow- orange azo dye. draw a reaction scheme.

F2(g) in grams per cubic centimeter if at 0 celcius 1 mole of it occupies 22.4L

1. how many calories of heat are required to raise the temperature of 23.4 kg of glass from 31ºc to 65ºc?
2. how many joules of energy are required to raise the temperature of exactly eight fluid ounces of pure water from room temperature?