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The question is one working out the equilibrium expression for some acids.

Citric Acid (H3C6H5O7)
Ka = 7.1x10-4
Is N2O5 a polar molecule?
(i) RCH2COOR -----> RCH2COOH
(ii) (CH3)2CHR -----> CH3CHClR
Indicate the oxidation state of carbon in the reactants and the products for all the reactions
(i) RCH2CH2OH -----> RCH2COOH
(ii) RCH2COOR -----> RCH2CH2OH
(iii) HC triplebond CCH2R ----> (CH3)2CHR
Indicate the oxidation state of carbon in the reactants and the products for all the reactions
Monika had some guests visiting one Sunday afternoon. While serving them tea from the kettle, a gush of steam suddenly burns her fingers and she feel intense pain. Her mother advises her to put fingers in cold water. After sometimes the pain subsides. Answer the following question based on the above situation. What could be the possible reason for the intense pain felt by Monika? Why does mother ask her to keep her fingers in cold water? What value are promoted by monika's mother
Ether, an organic compound that used to be used as an anesthetic, has a density of 0.736g/cm^3 at 20 degrees Celsius . What is the volume, in liters, of 225.0 grams of ether?
Assign an oxidation number to each element in the reaction.

CaF2(s) + H2SO4(aq) → CaSO4(aq) + 2HF(g)

In CaF2, the oxidation number of Ca is
, and that of F is
. In H2SO4, the oxidation number of H is
, that of S is
, and that of O is
. In CaSO4, the oxidation number of Ca is
, that of S is
, and that of O is
. In HF, the oxidation number of H is
, and that of F is

my name is mehran.i am very interested in environmental science and i am going to study that next year for bachelor's degree.i don't know any subject related to that and i need to know what should i read to be prepard for this major? because i know everything in this field is about chemistry i mean how much chemistry i have to know before studyingenvironmental science and what kind of chemistry books i should read? thanks.
Calculate volume of solution of HCl of density 1.12g/ml containing 40% by weight of HCl needed to produce 1.78 litres of Cl2 at STP.

MnO2 + 4HCl -> MnCl2 + 2H2O + Cl2
What is the final concentration of the solution made by mixing 50ml of 0.5M H2SO4 solution and 75 ml of 0.25M H2SO4 solution.