FREE CHEMISTRY AND STUDY GAMES ABOUT CHEM 105

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FREE CHEMISTRY AND STUDY GAMES ABOUT CHEM 105

LAB FINAL EXAM QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -48 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation

Question 1: how to clean a buret

Answer:

stored with distilled water.remove water, if no droplets form its clean, if not wash with detergent

Question 2: reaction rate depends on what factors?

Answer:

• concentration of the reactants

2.temperature at which reaction occurs

• pressure of a catalyst

Question 3: reduction

Answer:

chemical gains electrons

Question 4: pipette use

Answer:

transfer liquid of known amount

Question 5: how to fill buret

Answer:

rinse 2-3 times with liquid to be contained. drain through tip, make sure to rotate so that liquid goes all around inside. then fill slightly above 0 mark. open stopcock, drain to waste beaker to fill tip. no bubbles.

Question 6: oxidation

Answer:

chemical loses electrons

Question 7: units rate constant 0 order

Answer:

M/S

Question 8: hwo to use litmus paper

Answer:

take glass stirring rod and dip into solution. touch this to litmus paper

Question 9: units rate constant 1st order

Answer:

s-1

Question 10: red litmus turned blue

Answer:

basic

Question 11: lab 1

Answer:

mg ribbon with water and HCl to form H2 gas

Question 12: lab 5b

Answer:

Zn/Sn anode, Cu/Ag cathode.

Question 13: what is standardization?

Answer:

process of using a standard to find the precise concentration of another solution .

Question 14: procedure for top loading balance

Answer:

place empty weighing container on balance pan, tare to obtain zero reading. carefully add chemical to container. read mass to 0.1g once units stable

Question 15: procedure for anayltical balance

Answer:

close door, empty pan. tare, place object on pan, close door, wait for star, record to 0.001g

Question 16: first order reaction

Answer:

• straight line of ln[A] vs time

• slope of best fit equals neg rate constant (-k)

Question 17: lab 3

Answer:

titrimetry. -method for determining quantities. standardization of NaOH. fill buret with naoh , erlenmeyer has khp and phenophalin. same with ascorbic acid .

Question 18: which pipettes can be blown out?

Answer:

frosted tip

Question 19: glassware for holding/transferring

Answer:

beaker, grad cylinder, Erlenmeyer, graduated pipettes

Question 20: volumetric pipette procedure

Answer:

draw liquid to calibration mark, remove suction unit, and place finger.

Question 21: what is an endpoint

Answer:

point at which the colour of the indicator just changes colour.

Question 22: second order reaction

Answer:

• straight line of 1/[A] vs time

• slope of best fit equals pos rate constant (k)

Question 23: glassware for measuring/tranferring

Answer:

volumentric flask, volumentric flask, burettes

Question 24: volumetric pippete

Answer:

deliver fixed amount

Question 25: how to use buret

Answer:

wait 15s for liquid to settle. buret should be read to 2 decimal points! once done tranfering, close stopcock, take final buret reading.

Question 26: what is decanting

Answer:

seperating ppt from supernatant.

Question 27: volumetric pipette precision

Answer:

2dp

Question 28: vitamin c, ascorbic acid is a ?

Answer:

acid, proton donor