question number 7 (b) a paradigm shift (c) buoyancy distortion (d) the chevron a

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question number 7

(b) a paradigm shift (c) buoyancy distortion (d) the chevron angle @)parallax 6. What should you not do with a transfer pipette? (a) transfer alcohols (b) blow the last drop out when emptying (c) suck up liquids with your mouth @(b) and (c) (e) (a). (b) and (c) 7. Anhydrous magnesium perchlorate, barium oxide, alumina, phosphorus pentoxide, calcium sulfate and silica gel have this in common: (a) they are all desiccants (b) they are all white powders (c) they are all components of sand (d) they are all insoluble in water (e) none of the above In a gravimetric analysis you mistakenly forget to dry the fiter crucibles before collecting precipitate. After filtering the product, you dry the product and crucible and weigh them togeth Is the error in the mass of product that you report systematic or random? Is it always high or always low? (Two answers separated by comma) (a) systematic, low (b) systematic, high (c) random, low (d) random, high (e) None of the ab 9. When using a pipet you should (a) grasp the pipet in your fist and use your thumb to control the level (b) grasp the pipet with your fingers and use your index finger to control the level (c) use a pipet bulb (d) (a) and (c) eb) and (c) 10. When making a 250.00 mL of 100.00 ppm Cu stock solution from CusO (a) weigh the CuSO, on a top loading balance; dissolve the CusO, and dilute to the mark 250 mL Erlenmeyer flask (b) weigh the CuSO, on an analytical balance; dissolve the CusO, and dilute to the mark 250 mL Erlenmeyer flask weigh the CuSO, on an analytical balance; dissolve the CusO, and dilute to the mark (d) weigh the CusOs on a top loading balance; dissolve the CuSO, and dilute to the mar 250 mL volumetric flask 250 mL volumetric flask

Explanation / Answer

Multiple choice

7. magnesium perchlorate, barium oxide, alumina, phosphorous pentoxide, calcium sulfate and silica gel have this is common,

(a) they are all dessicants

All of them can be used to remove moisture (or trace amounts of water) from either liquids ate gases.

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