Other Chemistry Answers

Does asphalt parking contribute to photochemical smog

1. A solution of NaCl is neutral, with an expected PH of 7. If electrolysis was carried out on 500 mL of an NaCl solution with a current of 0.500 A, how many seconds would it take for the PH of the solution to rise to a value of 9? (PH is related to H+ concentration by PH = -log [H+]).

2.42.10cm3 of a solution containing 2g of an acid (H2X) per dm3 neutralizes 28cm3 of solution containing 2.5g of potassium hydroxide per dm3. Calculate

i.The concentration of the acid in moles/dm3

ii.The molar mass of the acid H2X

iii.The value of X

iv.The percentage by mass of X

Describe the ways of classifying amino acids and give example of each class

calculate the amount in moles of H2SO4 present in 25.0cm3 of 1.00moldm-3 H2SO4

5. STOICHIOMETRY QUESTION: Silver is widely used for jewelry and for tableware. The tarnish on silver is a layer of silver sulfide that forms according to the following reaction:


4Ag + 2H2S + O2 → 2Ag2S + 2H2O


What mass of silver sulfide would form from the reaction of 0.015 g of silver?

49. When the following oxidation-reduction equation representing a reaction that takes place in acidic solution is correctly balanced using the smallest possible whole number coefficients. the coefficients before HSO3^-, MnO4 and the H2O are: HSO3^- + MnO4^- = Mn^2+ + SO4^2- 50. In the oxidation-reduction reaction below: ClO3 + Cl = Cl2 + ClO2 a) O is oxidized and Cl is reduced. b) Cl is oxidized and O is reduced. c) Cl is both oxidized and reduced. d) O is both oxidized and reduced. e) None of the above is true.

42 ml of 1.1 mol/L hydrochloric acid reacted with excess sodium hydroxide. How many moles of sodium chloride were produced?

10.00grams of magnesium acetate is dissolved in 100.00 ml of DI water . The molar mass is 142.41g/mol . Calculate the molarity

Four different solutions of equal volume (1l) were prepared by

dissolving one mole of each of the following substances. The conduction of

electricity is least in the solution containing.

A. HNO3 B. kCl C. CH3COOH D. HCl