Explain why it was important to clean each piece of metal you used with sandpaper prior to doing the experiment. (2) what specific problem might you have encountered had you cleaned the metal surfaces witha soft tissue instead? on the basis of your results from this experiment, what observation(s) did you make that woul allow you to determine the place h2 would take in your relative activity series?

Metal has a oxide layer when in air. Before an experiment cleaning it with sand paper will remove the leyer of oxide and ensure truer results.  Cleaning with tissue paper will not result in removing the layer of oxide.

Shows how active H2 can be.

Explanation:

unlike the threaded fasteners which are used to clamp the machine members, power screws are used to transmit power. common applications of power screws are: screw jacks: to lift weight. lead screw of lathe: for axial movement of tool and its precise positioning.

answer:

i lost in getting someone back.

i learned that people are really two-faced and no matter how angelic someone appears they always have a devil side and that you cant trust anyone anymore no matter how dear they are to you.

if your wondering who it waz it waz mah still miss her tho

~batmans wife dun dun