General Chemistry Answers

Topics:Further synthesis and analysis 

Q1

Describe a simple chemical test for distinguishing between the following pairs of compounds:

a) cyclohexane and cyclohexene (2 marks detailed answers with explanation for every step answers please)

b) propanol and propanone (2 marks detailed answers with explanation for every step please)

c) propan-1-ol and propan-2-ol (3 marks detailed answers with explanation for every step please)

Detailed answers please with explanation for every step please

Q2

Suggest how the following syntheses could be carried out in the laboratory:

a) chloroethane to ethanoic acid (5 marks detailed explanation with answers please)

b) chloroethane to 2-hydroxypropanenitrile (5 mark detailed answers with explanation for every step please)

c) chloroethane to aminoethane (1 mark with detailed answer with explanation for every step please)

How do I know if the silica in the bag packed is saturated or can be used directly without preheating? (I know the case in the desiccator once the silica turn to pink it needs to be heated to reuse it again) how about the silica in the bag, how to know the condtion.

and if it needs to be heated, at what temperature should be heated in the oven and for how long?

Hellium takes 5 seconds to effuse from a hole of 10dm3 containers. How long would it take for oxygen to effuse from the some container at the same temperature and pressure? 

Quantam number gives?

A 50.0 mL sample of 0.100 mol/L hypochlorous acid, HClO(aq) is titrated with 0.200 mol/L potassium hydroxide solution, KOH(aq). Draw the pH curve for this titration given the listed volumes of added base: (Ka = 2.8 x 10-8 ) a. 0.0 mL b. 10.0 mL c. 25.0 mL d. 30.0 mL.

n=2, ℓ =1, ml= -1, ms= +1/2

What is the concentration in ppm of Se if 2.3 mg is found in 5000 kg of soil?

the ph of a solution 11.5 calculate the hydrogen ion concentration of solution?

If steel wool (iron) is heated until it glows and is placed in a bottle containing pure oxygen, the iron reacts spectacularly to produce iron(III) oxide.

Fe(s) + O₂(g)  Fe₂O₃(s)

If 1.25 g of iron is heated and placed in a bottle containing 0.0207 mol of oxygen gas, what mass of iron(III) oxide is produced?

The hydronium ion concentration of vinegar is approximately 4×10^-3M. What are the corresponding values of pOH and pH?