Using micropipettes for delivery of small volumes pg 5-8

1. if you need to pipette x µl, which micropipette/pipetman would you use?

2. how do you use a micropipette?

3. if you pipette xµl onto a tared weigh boat, what weight should you get in grams? and why?

4. being able to read what micropipettes are set to (pg 6)

5. when would you use a pipet-aid vs a pipetman

6. when should you switch your tip?

7. how do you use the analytical balance?

the number of valence electrons for each molecule or ion is shown beneath the structure. remember hydrogen will not have more than two electrons. this hydrogen is part of a covalent bond (sharing two electrons). a double bond here would cause hydrogen to share four electrons with phosphorus.

a  solution  is always transparent, light passes through with no scattering from solute particles which are molecule in size. the  solution  is homogeneous and does not settle out. a colloid is intermediate between asolution  and a  suspension. while asuspension  will separate out a colloid will not.