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A purified sample of napthalene is grey and has the same melting range as a white purified sample. What causes the grey colour.

Four test tubes, with unknowns labelled A B C and D contain substances which have approximately the same melting range How could you prove that the test tubes contain four different compounds?

I...

I have two questions. Fristly, why is it incorrect to speak of a melting point?
Is it because the impurities in a sample will have various melting points and therefore you should use the term...

1) In addition, between tenants, the apartment must be inspected by the relevant parties such as plumbers, exterminators and electricians

2) In addition, between tenants the apartment must be...

25cm3 of a commercial bleach NAOCl is diluted to 250 cm3 . A 25 cm3 of the diluted solution is added to an excess of potassium iodide solution and titrated against 0.200 M sodium thiosulphate...

have to find the molarity of an Unknown acid, but I was wondering how.
I used this equation
Cr2O7+14H+ + 6S2O3 = 2Cr + 3S4O6 + 7h2O
We had to find the molarity of sodium thiosulphate which was...

Hi this is a biochemistry assignment The question is

If 45mg of A (MW 190D) is dissolved in 10 ml of water in a test tube incubated at 23 degrees with an appropriate catalyst until equilibrium is...

A 25.0 cm3 portion of a solution containing Fe2+ and Fe3+ ions was acidified and titrated against potassium permanganate (VII) solution. 15.0 cm3 of a 0.0200 mol dm-3 solution of potassium manganate...

Why is the amino acid glycine non polar?

6. Given a 1.0M solution of acetic acid pKa= 4.76 and sodium acetate, describe how you would prepare a 1.0L of 0.10M acetate buffer.

I solved the problem

How would I find the RMM of the unknown metal if the molarity of HCl = 0.1 M , NaOH = 0.1
The Metal was dissolved in 80 cm3 of HCL and titrated against 22. 74 cm3 of NaOH. The mass of the metal was...

How would I find the RMM of the unknown metal if the molarity of HCl = 0.1 M , NaOH = 0.1
The Metal was dissolved in 80 cm3 of HCL and titrated against 22. 74 cm3 of NaOH. The mass of the metal was...