May 30, 2015

Posts by Newton

Total # Posts: 10

A mixture of powdered carbon and an oxide of lead was heated producing lead metal and carbon dioxide.when 13.70g of the lead oxide was reduced to lead by carbon,960cm^3 of carbon dioxide measured at r.t.p was formed. Calculate the empirical formular of the lead oxide???
May 10, 2015

A student was asked to prepare a sample of copper(ii)sulphate crystals(CUSO4.5H2O) given 5g of of copper (ii)oxide (CUO) as the starting material.if 10g of dry crystals of CUSO4.5H2O were obtained,calculate the percentage yield???
May 10, 2015

First start by converting the angle in radians to degrees, hence will have Sin(90-x)=cos x =sin90cosx-cos90sinx, sin 90=1 and cos 90=0 =1(cos x)- 0(sin x) =cos x (proved)
May 10, 2015

the volume v of a sphere of radius r is given by v=4/3pie r^3 what is the fractional change in v for a fractional change in r
September 25, 2014

math place value
how many tens if there were no hundred dollars for eg:200=what?
March 12, 2013

how many tens if there were no hundred dollars?
March 12, 2013

Declare a string variable name myName
February 13, 2013

Java progamming 1
I want the program to ask for and get the price of a book from a user. The program will then multiply the price by 7% sales tax and display both the sales tax and final price of the book (price + sales tax) on the screen. using Netbeans
February 11, 2013

what is an e.m.f
October 23, 2011

2. On the inside of an airplane the air pressure is about 85% of the atmospheric pressure at sea-level while outside, when it is cruising, the pressure is about 25% of the sealevel atmospheric pressure. If a window is 0.46 m in diameter, what is the net outward force on the ...
February 11, 2011

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