Recent content by rahmatkat

Thanks guys, I think I get it now.

Oh, So Aluminium Oxide did form? As for the reaction, the oxygen present in the Alumium Oxide react first with the acid and when that Oxygen dissapear, the acid then react with Aluminium, is that rihgt?

Oh, I get it now, aluminium react with oxygen gas in the air and produce Aluminium Oxide forming in the outside part of an aluminium metal right? So when that aluminium metal is reacted with an acid, Aluminium Oxide reacts first with the acid and when it finished reacting with it, the acid then...

Well, my idea is that it has a high melting and boiling point and its resist corrosion, unfortunately my answer above is wrong and i don't have any other idea why it reacts slowly with acid at first and then faster.

Can anyone help me with this homework question? it was like this: The reaction between the acid and aluminium is slow in the beginning and then gets faster. Give an explanation for this observation. Thanks.

So I have to find out the kinectic energy of the two ball's as well, I think that were i got everything wrong 'cause I was only trying to find the velocity of the balls. Thank for the help.

Hi there, can anyone help me with this problem, I'll be grateful to received your help. It was like this, we were doing an experiment on collision and this is how it goes; We place a ramp on table and a sheet of paper at the bottom of the table but close to the edge. Then we put two...

Explain why the backing volts depends on the frequency of light but not on the intensity.

sorry but I don't have a textbook, that why I was asking for your help guys. I know that it sounds funny but in our school we weren't given any textbooks, we just have to rely on our teachers notes, the reason is that we don't have much, and another problem is that i left my form five chemistry...

I have add the formula weight of water and calcium, and I don't know how to convert mole ratio to mass ratio cause i forgot how.

I have an assignment that i have to do this weekend and i was wondering if anyone can help me with it, here's the only question that I don't understand; 1)calculate the mass of the water that will react completely with 4.0g of pure calcium metal according to the following equation: Ca(s) +...

Sorry, i was anwering someones question, maybe i got on the wrong side of the track. By the way, What is the formula for centripetal Force? it new to me.

Thanks for you're help, anyway i have another question. What is the formula for centripetal force?, our physics teacher gave us a practical to do but he forgot to give us a note on centripetal force.

I think youre wrong, though the pan and the hammer have the same mass, the hammer will drive the nail futher.

Hi, can anyone please tell me the fomular for the velocity of a centripetal force with the radius of 100 cm, with one revolution revolting in 0.98 seconds?