Qualification > Sciences
Edexcel CHEMISTRY DOUBTS!!!!
Alaa Mounier:
can anyone solve this question?
A- Aluminum is extracted by electrolysis of Al2O3. What is the maximum mass of the metal that could be obtained from 1 tonne of the oxide?
B- If the yield of the electrolysis plant is 90%. What mass of the oxide must be used to produce 1 tonne of aluminum? >:(
conquerpro:
can anyone please solve this question?i need it ASAP.when excess calcium is added to water what is observed?
Candiah:
When Calcium is added to water it fizzes (efferevescence); water turns milky or cloudy. Calcium hydroxide is not very soluble in water.
Ca + 2H20 -----> ca(OH)2 + H2
conquerpro:
what is the oxidation state of ozone O3?
Candiah:
Io3- + 5 I- + 6H+ -----> 3I2 + 6H2O
s2O3-- + I2 ------> S4O6-- + 2 I-
so IO3- ie equivalent to 3 I2 equivalent to 3 S2O3--
moles of thiosulphate = 30 x 0.5/1000 = 15 x 10-3
moles of iodate = 15 x 10-3 /3 = 5 x 10-3
25 cm3 ===== 5 x 10 -3
1000 ======= 5 x 10-3 x 1000/25
0.2 mol dm-3
sorry about the upper and lower case I can't do them
sorry i don't know how to do upper and lower cases
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