Thursday
April 24, 2014

Posts by Hol


Total # Posts: 11

Chemistry
For the titration of hcl versus NaOh, suggest a better indicator than methyl orange. Why is methyl orange not the ideal choice for this application?

biology s103
Has anyone got any clues on tma 7 q3? I have posted the question regarding meiosis and Huntington disease but im still stuck.

Biology
I have to draw a labelled diagram to show the chromatids of a diploid cell at the end of anaphase I of meiosis for a person who is heterozygous for both characters. (both characters being Huntingdon disease(H) on the short arm and red hair gene(R) on the long arm.) I know that...

biology
I have been given a DNA nucleotide sequence and have established the equivalent mRNA sequence.I have then been given 2 mutations and I have worked out the new mRNA sequence but I have to suggest why it may change the function of the new protein. The new sequence is AUA AGC UUU...

Biology
I have to draw a mating diagram to show a cross between two heterozygotes for lactose production. As both adults have the dominant allele L for persistant lactase production would I start the diagram with LL for each parent? Yes, if you mean production. Lactose digestion genet...

Science
"a drop of oil (volume 0.05cm3) is released from a medicine dropper on to the calm surface of a pond where it spreads out to cover an area of 40cm2. Assume that the oil film has a uniform thickness equal to the diameter of an oil molecule. Calculate the diameter of an oil...

Chemistry please check!
A 0.21g sample of sulfuric acid is dissolved completely in sufficient water to make 0.25 litre of final solution. Calculate the hydrogen ion concentration in mol1-1 in this solution and show successive steps in the calculation: If 0.21g in 0.25l then 0.84g in 1l. Add together ...

chemistry
NaCN + H2O = HCN + NaOH Is this equation balanced ok? Yes, it is balanced. thanks very much

chemistry
I have to draw Lewis structures for hydrogen cyanide and cyanogen with nitrogen valency of three. Would I still need 2 dots after the N in hydrogen cyanide or would this represent nitrogen with a valency of 5? Yes. THose two "dots" are unshared electrons. Thanks. Whe...

chemistry
I'm drawing a Lewis structure for hydrogen cyanide using nitrogen with a valency of 3. Would I still need 2 dots after the N or would this represent nitrogen valency 5? You need the two extra electrons for N at the end. Only the electrons involved BETWEEN the elements are ...

Chemistry
"explain with the help of an appropriate labelled sketch diagram how hydrogen atom which has only one electron has so many spectral lines" Can someone tell me if i need to draw a schroedinger model of an atom or if i need to draw an energy level diagram? I'm not ...

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