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FAQ

Explain anodising of aluminium equation?The equation is :6OH-(aq) + 2Al(s) → 3H2O(l) + Al2O3(s) + 6e-1) Why doesn't aluminium dissolve into aluminium ions? Aluminium is the electrode after allIt seems easier to take electrons from aluminium electrodeElectrode is a big factor in predicting reactions according to examples.2) Why does OH- react instead of H2O? [OH-] is very low due to the H+ by H2SO4 and originally low auto ionisation of water.3) Why do descriptions say O2 is liberated at anode when it is not a product in the equation?

use the Peano's problems solving method

My cousins are coming to my family get together where the people have bonfires, food, and everything elseThey have a good timeTwo of my cousins never been camping and one tried it once and wanted to go home after 2 hrsI want to scare the crap out of them at 3 a.mANY IDEAS? I want to pull it off this coming Friday! I've thought of using exploding 2 Liter pop bottles (Aluminum Foil and The Works toilet bowl cleaner) ~My Fave~ that sound like a very loud gun going off and a stink bomb recipe (Ammonia and matches sealed inside a glass jar) :)Does the stink bomb potion work? I never tried it B4.

Just remember, what goes around comes around.

Granulated sugar (Domino brand)MilkEggsButter SaltVanilla extractQuaker oatsFrozen strawberriesFrozen bananasThat's all I have.

I would probably go to the dry cleaners.

i need help in chemistry and i really don't get thisi need help

any of the commerical over the counter products or try a mix of 50 prcent vinegar and 50 percent water

Also, is it ok to use vegetable oil on a cookie sheet instead of nonstick spray?

depends on the recipe as for the parchment paper and yes to the oil.soak a little on a waaded up paper towle and spread it on the sheet from the paper towel

I'm building a science project with my little sister, and we quite frankly need some helpThe plan is to make a little rollercoaster out of plastic tubing as the trackIt's kind of thick, so it doesn't bend very wellWe've been straightening it out for a couple days, but it's still slightly wavyWe need to get it into a solid positionThe plan is to support it on some boxes, and maybe tape it down so it holds it's form.But, there is a part in the rollercoaster where it needs to be extremely straightAny ideas??

Heat it where you want the bendIf it is small tubing and depending on what it is made of, place where you want the bend to be in boiling water, take it out, bend it to shape and hold it there until it coolsIf it is of a better material or thicker, wrap it with aluminum foil and hold it over a candle, but beware that it will get very hot and may start to meltP.SAfter reading again, you want to straighten it, so you will need to heat it and then roll it back and forth slowly until it cools.

if i have a piece of rectangular tubing a 2x6 and am trying to bend it to a 42 1/2 inches circle the hard way what size of triangles i need to cut out and how far a part do i need to do it i know that i got take slices off pizza out of it to make it turn to a circle a true circle

Even by cutting out triangles and bending, you will not have a smooth circleIt will be a polygon, many short straight segmentsA better way is to bend a ring 42.5 diameter out of 2 x 1/8th aluminum or steel and weld itThen do another that is 30.5 diameterNow cut two donuts with 42.5 diameter outside, and 6 inch widthThen weld the three pieces togetherThat will give you a smooth ringYou may not have to make full donuts, but you could use 2 inch wide straps running radiallyA dozen might be enough on each face.

what metal is better for a heatsink pper or aluminum?

It's true Cu retains heat better than AlHere are the simple clues: Cu have higher conductivity and Specific heat than AlConduction (CPU/Transistor to heatsink) needs good thermal conductivityConvection (Heat sink's fins to ambient air) needs a lot of surface area simple explaination: While with higher conductivity, Cu will transport heat faster, but with the higher specheat Cu will stores more energy than Al (at the same shape and volume) while having the same surface area, thus Cu will be harder to dissipate convectively Now the long explaination: Copper is a good candidate as first line 'heat sink', it will absorb a lot of energy before increasing 1 deg, meaning for a CPU at 47 deg and ambient at 27 deg, it will hold 27282930 deg longer than Al as it heats up- GOOD now comes the drawback, with the high specific heat, when copper try to release heat to ambient air, it will maintain it's hot temperature longer than Aluminum simply because it has to dissipate more energy to ambient air before dropping 1 deg in tempSo, let's imagine copper fins with the same shape and volume as Al, it will take a lot more air to cool the copper (not to mention it's heavier too) than the Al- BAD Thus the reason using Al for fins, and copper for heat block (sink)asborbing heat from transistor or CPU got to do with small contact surface area, in which case higher thermal conductivity allows lower interface junction temp)while the Al fins dissipate heat more efficiently (in terms of heat flux/weight/size) than cooper.