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Lead (IV) oxide reacts with concentrated hydrochloric acid as follows: PbO2(s) + 4HCl(aq) -----> PbCl2(s) + Cl2(g) + 2H2O(l) What mass of lead chloride would be obtained from 37.2g of PbO2, and what mass of chlorine gas would be produced

In this question we have to use the equation Moles= Mass(g)/ Mr. We have the mass of PbO2 so to find the moles we need to divide the mass, which is 37.2g, by Its Mr, which is 207.2 + (16 2) = 239.2. the answ...
AA
Answered by Aisha A. • Chemistry tutor
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How can a student test for the prescence of a halide ion?

Add a drop of each liquid to individual test tubes.To each test tube, add dilute nitric acid and silver nitrate solution.A precipitate will form for each ion present.chloride= whitebromide= creamiodide= yell...
MP
Answered by Marco P. • Chemistry tutor
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Describe the steps of mitosis. (10 Marks)

One mark is given for correctly naming each step (of which there are 7 possibilities). Another is given for a correct description of each stage.Prophase: Chromatin condenses to chromosomes / nucleolus disapp...
MG
Answered by Michael G. • Biology tutor
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Why are neutrinos hard to detect?

Neutrinos are hard to detect because they are 100,000s of times smaller than an electron, so are too small to detect with current equipment. They also dont have a charge and do not interact with any other at...
MC
Answered by Mahira C. • Physics tutor
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The tangent to a point P (p, pi/2) on the curve x=(4y-sin2y)^2 hits the y axis at point A, find the coordinates of this point.

p=4pi 2 differentiating with respect to y we have dx/dy = 2(4y-sin2y)(4-2cos2y) substituting in the value of y =pi/2 we have dx/dy = 24pi, which means dy/dx =1/pi24using (y-y_1)=m(x-x_1) we have y-pi/2=1/24p...
GN
Answered by George N. • Maths tutor
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