8 In this question you should use changes in oxidation numbers to balance a chemical equation.
Acidified potassium dichromate(VI) solution can oxidise a solution of V2+ ions. The equation for
this reaction is shown.
a Cr2O72- + b V2+ + CH* → d Cr3+ + e VO3- + fH2O
What is the ratio a:b in the correctly balanced equation?
A 1:1
B 1:2
C 2:1
D 4:1

What’s a special glass that most beakers are made of

Select the correct text in the passage. which sentences describe examples of sustainable living? i live in an old apartment building downtown, but my company is based in an office park on the outskirts of the city. i drive an old car that needs to be replaced. i plan to buy a hybrid for better gas mileage, but for now i am able to carpool with a couple of friends from work. the drive to the office park is about 45 minutes each way, but we do get to work in a modern building. the architects just received a leed certification for the design.

Chromosome 17 is made of over million base pairs.