Help with short Chemistry questions?

Posted on 2016-02-20 14:21:00 in Chemistry by JACK

It's just a few short questions that I can't get my head around. Thanks :) 

A) What is the percentage by mass of chromium in sodium dichromate ? 
B) Explain the effects of an increase in temperature on the rate of a chemical reaction ? 
C) What mass of copper would be needed to produce 2.56g of copper {II} oxide ? 
D) Name the spectroscopic technique used in environmental analysis to detect heavy metals such as lead. 
E) How many electrons are there in 4.6g of sodium metal {Na} ? 
F) Name the series of coloured lines in which the line emission spectrum of hyd

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