Amandeep

What is the percent ionization of a 1.38 mol/L weak acid if its Ka = 2.7 x 10^-6? Thanks again!

What is the pH of a 1.24 mol/L solution of HCN(aq) if its Ka = 6.2 x 10-10? Rate my answer please For your understanding: HCN ⇌ H+ + CN-, Ka = 6.2x10^-10 = [H+]*[CN-]/[HCN] Notice the H+ and CN- ions are generated in pairs during HCN dissociation, hence [...

Enter the oxidation number with the sign above each element H2 OH^- Mg^2+ CO3^2-

Balance the follwoing chemical reaction in an acidic solution __H2O(l) + __H^+(aq)+ OH^-(aq)+ __ CR2O7^2-(aq) + __ Cl^-(aq)---> __ Cr^3-+ __Cl2(aq)+ __H2O(l) + __H^+(aq) + __ OH^-(aq)

What am I doing wrong? If a current of 54 A flows into a cell for 45 minutes 30 s, determine the mass of chronium deposited. My answer: 54 x 2730 s = 147420 147430/96485 = 1.52 mols m = n x M =1.52 x 52 = 79.5

Chromium metal can be plated onto an object from an acidic solution of dichrmonate tions. What average current is required to plate 17.8 g of chronium metal in a time of 2.20 h? ( you will need to construct your own equation for the half-reaction)

tanx = 5/12 and sinx<0 Find sin2x and cos2x How to get the answers of sin2x = 120/169 and cos 2x = 119/169?

cotx = -2 and 0 less than or equal to x less than or equal to pi Find sin2x and cos2x How to get the answers of sin2x = -4/5, cos2x = 3/5?

A ball is thrown upwards from ground level and reaches a height of "h" metres after "t" seconds, given by the formula h=20t - 5t^2

What am I doing wrong? If a current of 54 A flows into a cell for 45 minutes 30 s, determine the mass of chronium deposited. My answer: 54 x 2730 s = 147420 147430/96485 = 1.52 mols m = n x M =1.52 x 52 = 79.5

Will this help? A car bumper is plated with chronium using chronium(III)ions in solution. If a current of 54 A flows into a cell for 45 minutes 30 s, determine the mass of chronium deposited.

What is the slope of the line that joins the points (-1,-6) and (1,6) A. 0 B. No slope C. 6 D. -6