Saturday

September 24, 2016
Total # Posts: 7

**Chemistry**

Can't you be nicer and help me out? Thanks a lot (:

*June 30, 2011*

**Chemistry**

Write an equation (chemical or ionic) and use oxidation numbers to find out what is being oxidized and what is being reduced. (a) aluminum + oxygen (b) magnesium + steam (c) iron + dilute hydrochloric (d) copper(ii) oxide + carbon (e) bromine + potassium iodide solution

*June 30, 2011*

**Chemistry! I need help quick! Thank you very much!**

2h2O2 + 2H2O ---> 2H2O + O2 If 50cmcube , 2.0 mole/dmcube of hydrogen peroxide is decomposed and volume of oxygen gas collected. How much hydrogen peroxide is decomposed?

*June 19, 2011*

**Math algebra (urgent!) help me! Thanks a lot!! (;**

Mr lol bought x oranges for $30 and sold them at a profit of 5cents per orange. Write down the (i)cost price of an orange. (ii)the selling price of an orange When he had sold all except 20 of the oranges, he found he had received $28. (iii) form an equation in x and show that ...

*June 18, 2011*

**Math**

Btw Henry, why multiply by 20 in the end? Is it because he had sold all except 20 of the oranges?

*June 18, 2011*

**Math**

Appreciate both of you who help me! Thanks!!!!!

*June 18, 2011*

**Math**

Thanks a lot Henry! Your working is right! Btw, thank too Raymond for helping me out, I appreciate it a lot (:

*June 18, 2011*

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