Friday

November 27, 2015
Total # Posts: 10

**Chemistry**

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*

**Chemistry**

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*

**Trigonometry**

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*

**physics**

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*

**math**

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

**programming **

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*

**physics**

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

**Physics**

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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