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CHEM AND BIO HELP AND TIPS HERE
nid404:
--- Quote from: K_M on May 03, 2010, 09:55:24 am ---can someone please give me the answer to the following questions:
1. describe the passage of water from blood in the aorta to its excretion via the urethra
--- End quote ---
Blood is got to the kidney via renal artery. The renal artery divides into a great number of arterioles and capillaries, mostly in the cortex. Each arteriole leads to a glomerulus. The pressure in the glomerulus causes part of the blood plasma to leak the capillary walls. The RBC's and proteins in plasma r too big to pass out. The fluid that moves out contains mainly water with dissolved salts, urea, glucose and uric acid. The process by which the fluid is filtered out of the blood by the glomerulus is called ultrafiltration. The filtrate from the glomeruls collects in the renal capsule and trickles down the renal tubule. As it does so, the capillaries which surround it absorb the substance the body needs. All the glucose is absorbed, with much of the water(depends on the state of hydration). The some salts r taken back to keep the correct con in the blood. This process of taking back the required substances is called selective reabsorption.
Substances that r not needed pass further down to the collecting duct into the pelvis of the kidney. From here the fluid, now called urine, passes down the ureter to the bladder.
Nephron- A single glomerulus with its renal artery, renal tubule and blood capillaries
visit the site for a good animation http://www.biologymad.com/resources/kidney.swf
nid404:
--- Quote from: K_M on May 03, 2010, 09:55:24 am ---can someone please give me the answer to the following questions:
2. outline a treatment of sewage which would produce re-usable water
--- End quote ---
http://www.ehow.com/about_5368260_sewage-water-treatments.html
I dunno how much of it you wanted....i you told me the marks, i would've written down a good answer
nid404:
--- Quote from: K_M on May 03, 2010, 09:55:24 am ---can someone please give me the answer to the following questions:
3.suggest how the build up of sticky mucus would affect a sufferer of cystic fibrosis
--- End quote ---
Cystic fibrosis is an inherited disease which affects the lungs and digestive system. It results from mutation in a gene responsible for making a protein which is involved in the transport of ions across cell boundaries.
The effect is to produce a sticky mucus which clogs the lungs and can lead to serious infection. A similar sticky mucus also blocks the pancreas (a part of the digestive system) which provides enzymes for breaking down food. This gets in the way of the processes which convert the food into molecules which can be absorbed by the body.
$H00t!N& $t@r:
Hi, can you please help me solve the following question
0.5 g of magnesium is added to a solution containing 3.0 g of ethanoic acid. Which is the limiting reagent and how many moles of the other reagent are left unreacted?
Mg + 2CH3COOH ---> (CH3COO)2Mg + H2
Please explain fully with all the steps.
And can you please give an excellent website on moles?
Thanks in advance!
haris94:
first find the number of moles of each reactant
no. of moles = mass/molecular mass
so mg=0.5g and ch3cooh=3g
and ram of mg=24 and rmm of ch3cooh=60
moles of mg=0.5/24 moles of ch3cooh=3/60
=0.02 =0.05
now use mol ratio to find the number of moles used
(take the lower value from your answer of the no. of moles)
mg : ch3cooh
1 : 2
0.02 : x
x=2*0.02
x=0.04 moles
so ultimately your limiting reagent will be mg cause it was all used up in the reaction
and out of the 0.05 moles of ch3cooh, 0.04 were used up
hope i was able to help
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