Sunday
June 26, 2016

Posts by ruby

Total # Posts: 218

biology
in addition to the above a labelled diagram is also required to show the product cells derived from this cell at the telophase 2 stage of meiosis.there is no crossng over.what differences would there be in the product cells at telophase 2 of meiosis if there had been one ...
March 24, 2007

biology
Help required, Gametes are produced in the process of meiosis. In humans, one pair of autosmes (chromosome 4) has a short arm and a long arm. On the short arm is a gene for Huntington disease (H) and on the long arm is a gene for red hair(R). Draw a labelled diagram to show ...
March 24, 2007

biology
Help needed to draw a mating diagram where L is the dominant gene for the digestion of lactose and shows the crosses between two heterozygotes and wiht the the phenotypic and genotypic ratio of the offspring in the F1 generation. I also need to know the phenotypic prportions ...
March 13, 2007

chemistry
help required in calculating the pH value of a .84 mols per litre solution of sulfuric acid. I understand that pH = -log 10 (2x 0.84), I am not very experienced with logs and need assistance as to which keys to press on the scientific calculator in relation to the logs. thank ...
March 6, 2007

chemistry
I am in the process of calculating the hydrogen ion concentration in a .25litre solution of sulfuric acid,.21g of sulfuric acid was disolved in water to make the solution. I have calculated the molarity of the acid to be 2.14x10^-3 mol per litre. I also need help in ...
March 5, 2007

chemistry
I require assistance with the drawing of the lewis structures for hydrogen cyanide and cyanogen. I have already drawn the structured molecular formulas and am now stuck. H:C:::N: :N:::C:C:::N:
March 5, 2007

chemistry
In the compound tocainide I need to identify the two groups of atoms/groups that are linked with its binding to receptor cells in the human body by hydrogen bonding. I have understood the two groups to be alcohol and acid but am stuck on the next part. Hmmm. What alcohol. I ...
February 15, 2007

chemistry
I would like my equation checked, sodium cyanide and water.I have worked the balanced equation as: NaCN+H20=NaOH+HCN. If you want the molecular equation this looks good to me. Actually, it's the CN^- that is hydrolyzed (reacts with water) and the ionic equation is CN^- + ...
February 8, 2007

chemistry
I need help in drawing a structual formula for hydrogen cyanide(HCN)and cyanogen(CN)2, the drawing has to bear in mind the valencies of hydrogen(1),nitrogen(3) and carbon (4), any help appreciated H:C:::N: :N:::C:C:::N: Check my thinking. The previous one, too.
February 6, 2007

chemistry
help needed in drawing the diagram to show how hydrogen has numerous spectral lines I also need help with this question.... ---------------- ---------------- ---------------- ---------------- ---------------- -------------------- Each line above represents an energy level for ...
February 6, 2007

Science
mols of HCl= 0.1N X 0.5L=0.05 mols of HCl Therefore, number of mols of 2N NaOH needed to obtain pH 6.8: 0.05 mols HCL/2 = 25 mL Is this right? answered below.
February 5, 2007

Science
How much sodium hydroxide, at what concentration, do I need to add to 500 mL of 0.1 N HCL to obtain pH 6.8. How do you calculate this? pH = -log(H^+) M HCl = N HCl mols = M x L. After you know mols HCl you have, then make a solution of NaOH and calculate how much of that must ...
February 5, 2007

physics
Assistance required as to why visible light is not emitted when infrared radiation falls on fluorescent materials.
February 5, 2007

chemistry
addtional information: the diameter of the oil film on the water is 40cm^2 see my post.
February 4, 2007

chemistry
I have a problem that I need help with. The diameter of the oil molecule has to be calculated and presented in scientific notation. The data in the questions tells me that drop of oil(volume 0.05cm ^3) is released from a dropper onto the surface of the water.The film of oil ...
February 4, 2007

math[fractions]
how would u multiply two fractions ex. 2 2/3 times 3 5/6 First, make each one an improper fraction. To do this, multiply the denominator by the whole number in front of it and then add the numerator. Put all of that on top of the denominator: 3*2=6 6+2=8 2 2/3 = 8/6 = 4/3 6*3=...
January 23, 2007

mummification
what was the substance used to stuff nostrils? The ancient Egyptians stuffed the nostrils with resin or wax. http://209.85.165.104/search?q=cache:3ghP1ChFOJYJ:www.touregypt.net/featurestories/mummification.htm+mummification+nostrils+resin&hl=en&gl=us&ct=clnk&cd=1&ie=UTF-8
January 23, 2007

Science 9
2.0kg block of iron transfers 180,000j to the atmosphere around it. If its initial temperature was 350 celius what is it's final temperature? If you know the specific heat of iron, you can use Q = mc(delta T).
December 30, 2006

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