Monday
September 1, 2014

Posts by lena


Total # Posts: 995

Air and Butane
Thanks
December 12, 2008

Air and Butane
If air was at STP and butane was released, would the butance sink or woulf ir rise to the ceiling? I know that the density of air at STP is 1.292g/L. How would I go about figuring this out?
December 12, 2008

math/chem
I need to find the mass of butane gas and I only know the following things (you cannot use the molar mass of butane): volume = 80 mL pressure = 98.23 KPa temp.= 298K So I found the number of mols and I got 0.003171814 mols. of butane. But I don't know what to do after this...
December 12, 2008

Could someone plese help. Its quite simple.
Thank you.
December 11, 2008

Chem
I did this experiment where I filled a graduated cylinder with water. The I put a stopper on it and put it under water and removed the stopper. The with a modified lighter (that wouldn't release sparks) I added butane gas. I got the following results: mass of lighter = 15....
December 11, 2008

Chem.
How do you know it was 6 L of oxygen? I don't understand :S
December 11, 2008

Chem.
2SO2(g) + O2(g) ---> 2SO3 It says that 12.0 L of sodium trioxide are produced at 100 degrees celcius. What volume of oxygen is produced? How would I go about doing this. I was going to use PV=nRT but I dunno the pressure so I can't find the moles. What do I do?
December 11, 2008

Science
For phylum I matched taxon containing closely related phyla or divisons. Is this correct? :S
December 9, 2008

Science
I'm doing a matching assignment and I'm stuck on the last 2. Could someone please help me? Kingdom Class (to be matched with) Taxon of closely related orders. Taxon containing closely realted classes. I really don't understand this at all :S I've tried google ...
December 9, 2008

9th grade
Are you trying to solve for y? 12y-5y-2=0 12y-5y=0+2 7y=2 y= 2/7 Is this what you were asking for?
December 8, 2008

Math
3 1/15 - 3 11/30 Let's convert these into improper fractions: 46/15 - 101/30 Now we want a comman denominator: (46 x 2)/(15 x 2) - 101/30 92/30 - 101/30 Now we can subtract the top numbers and keep the denominator: -9/30 Now let's simply by dividing by 3: -3/10
December 8, 2008

Bio.
I don;t understand what a taxon is :S I looked at the wikipedia definition and I don;t understand it at all. Could someone please explain it to me a simple terms. Thanks.
December 8, 2008

Bio.
System of branching divisons that biologists use to place an organism into the appropriate taxon. What would the word be that fits that definition? Here are some possible words: binomial nomenclature classification system homologous structure kingdom natural selection I've...
December 8, 2008

Computer
Thank you :)
December 2, 2008

Computer
How do you download a video from youtube into your my documents?
December 2, 2008

Bio
What digestive enzymes does the pancreas produce (pertaining to the digestive system only)? The only one I know is Pancreatic Amylase. Are there any more?
November 28, 2008

Bicarbonate
Thanks Sra :)
November 25, 2008

Bicarbonate
The stomach secetes bicarbonate into the small intestine. Does the stomach secrete the bicarbonte into the duodenum? And if so, what does the bicarbonate go through to get to the duodenum?
November 25, 2008

Biology
Thank you :)
November 25, 2008

Biology
where does the small intestine connect to the large intestine?
November 25, 2008

Biology
Thanks Dr Bob :D
November 25, 2008

Biology
What is pancreatic amylase. I seem to find every kind of amylase except pancreatic. I need a good, understandable defination. Thanks.
November 25, 2008

Biology
Thanks Ms. Sue but I still can't seem to find them.
November 25, 2008

Biology
I'm making a picture book and I need to draw the following, what would they look like? Pepsin Bile Trypsin What I'm asking is what do the following look like. Is it a solid or a liquid and what color. Thanks.
November 25, 2008

Chem.
Thanks so much Dr Bob You helped so much Thanks
November 24, 2008

Chem.
If the silver was forming on the copper couldn't I just tap it off and it would fall to the bottom of a test tube and then I could just filter it out of the copper nitrate?
November 24, 2008

Chem.
What if I did this. - add copper wire then wouldn't the silver crystals attach onto the copper - then the copper would oxidize and you're left with silver would that work?
November 24, 2008

Chem.
I need pure silver so just Ag on it's own.
November 24, 2008

Chem.
thanks
November 24, 2008

Chem.
How would someone extract silver from silver nitrate? *silver isn't soluable in water so I was thinking I wouldn't be able to do a single displacment reaction. I don't know how to go about this :S
November 24, 2008

Biology
Does the pharynx seperate the esophogus from the trachea? What's the purpose of the pharynx? If the epiglottis blocks food from going down the trachea then whats the function of the pharynx?
November 23, 2008

comman sense
Is the throat the esophogus and the tranchea or is another name for the tranchea a throat. Whats the name for the esophus and the trachea. Like both together.
November 23, 2008

Chem.
but it would be very close to 7 though. right?
November 18, 2008

Chem.
ok thanks DrBob :)
November 18, 2008

Chem.
What if I used pH paper? If the pH read 7 would that necessarily mean that it is safe to drink?
November 18, 2008

Chem.
How would one cheak if the water they are drinking is clean?
November 18, 2008

10th grade
7x+11y=-5
November 17, 2008

Microsoft Publisher
Thanks :)
November 17, 2008

Microsoft Publisher
I am using microsoft publisher 2007. I just installed it yesterday.I made a poster on Microsfot Publisher (1page) and when I printed it, the program divided my work onto 4 different pages. How do I fix this?
November 17, 2008

Math
Thanks :)
November 13, 2008

Math
Oops :O Thanks
November 13, 2008

Math
Did I do this right? The shorter leg of a 30°- 60°- 90° right triangle is 7.5 inches. How long is the longer leg and the hypotenuse? 1) The longer side: 7.5/Sin 60 =b/Sin 30 4.208723391 inches Hypotneuse: 8.6 inches
November 13, 2008

Law
Thanks so much :)
November 12, 2008

Law
What is peaceful assembly?
November 12, 2008

English
could you give me an example of the literary term Conflict!?
November 11, 2008

Law
Thanks :)
November 11, 2008

Law
Using the Charter of Rights & Freedoms as an example, how would I explain what a right is and what a freedom is?
November 11, 2008

Canadian Law
What are some things that are in the Canadian Charter of Rights and Freedoms but is not in the Canadian Bill of Rights?
November 9, 2008

Canadian Law
thanks :)
November 9, 2008

Canadian Law
Between the Canadian Bill of Rights (1960) and the Canadian Charter of Rights & Freedoms, which is better able to protect the rights and freedoms of Canadian citizens and why? The answer is the Canadian Charter of Rights & Freedoms but I`m not sure why. This is what I`ve ...
November 9, 2008

Law
Thanks :)
November 8, 2008

Law
What's the criteria for being a Canadian citizen? And if you are born in Canada are you automatically a Canadian citizen? Like suppose you can on vacation to Canada from some foreign country and you gave birth to your kid here, would your kid be a Canadian citizen?
November 8, 2008

Law
Thanks Ms. Sue :D
November 8, 2008

Law
The Canadian Charter of Rights & Freedoms is a bill of rights. How to I do explain what a 'bill of rights' is to someone about 5 years of age?
November 8, 2008

Chemistry
Thanks Dr. Bob :)
November 5, 2008

Chemistry
0.27 - actual value of AlCl2 1.1173 - theoritical value of Alcl2 % Error = [(0.27-1.1173)/1.1173] * 100 = -76 % What are some reasons for the -76% error. I thought of 2 but i`m not sure if they're right. - we spilled some of the AlCl2 while the reaction was taking place - ...
November 5, 2008

Chemistry
Thanks so much !
November 5, 2008

Chemistry
For my theortical yield I got 1.1173 g For my actual yield I got 0.27 g I need to find my percent yield and percent error. Did I do this right? % Yield = (0.27/1.1173) * 100 = 24 % % Error = [(0.27-1.1173)/1.1173] * 100 = -76 %
November 5, 2008

Chemistry
Thanks :)
November 5, 2008

Chemistry
What does a negetive percentage error mean?
November 5, 2008

Geometry(Very Urgent!!!)
Since it's an equilaternal triangle you know that all angles are the same. So each angle is 60 degrees. 5x-2y = x+2y 5x-x = 2y +2y 4x=4y x=y so now you can use either equation 60= 5x - 2x 60= 3x 20 = x
November 5, 2008

Chemistry
If it was broken into 2 different questions. number one being find the limiting reagant and number 2 being find the theoritical yield of AlCl2 would it still be 1 significant digit?
November 5, 2008

Chemistry
I did a lab where I put Copper (II) Chloride in water with Alumnim. 2Al + 3CuCl2 -> 3Cu + 2AlCl3 The aluminum on the reactant side weighs 0.5 g and the CuClw weighs 1.69 grams. It said to find the theoricital yield. Did I do this right? 2Al + 3CuCl2 -> 3Cu + 2AlCl3 # of ...
November 5, 2008

Genetics
What are three sources of emobroyonic stem cells and how are they obtained from each? This is what I have so far: 1. Blasocyst of an embyro 2. Embilical cord of a baby 3. ? I don't understand how to explain how to obtain them. Don't you just remove them?
November 3, 2008

Genetics
Whats a homolog?
November 3, 2008

Stem Cells
Are adult stem cells found only in adults human beings or all human beings regardless of age?
October 31, 2008

BIO
Thanks so much :)
October 22, 2008

BIO
is it because in order for there to be a boy the dad would have to give a y because a mom can only give x and since the y is domiannt it would always express the trait>?
October 22, 2008

BIO
heres the question, I totally dont understand it: a few sex linked ttraits in humans are located on the Y chromosome and are dominant. What pattern of inheritence would uou expect to see in these traits? show your exmaplantion.
October 22, 2008

math
how do i solve systems of three equations with elimination??
October 20, 2008

law
what should someone do after being sexually assulted?
October 13, 2008

Law
thank you
October 13, 2008

Law
Why do people commit sexual assult? This is what I have so far: - for power or control - women-haters - have been assulted in the past could you tell me some more pls.
October 13, 2008

science
I put a peice of copper into a flame and I need to write a word equation for it. Whats a flame made up of cause I wanna write copper + _____ -> _______ + ________ I know its a synthesis reaction.
October 6, 2008

science
which would have the greatest ionization energy potassium ion, chlorine ion,or argon atom?
October 4, 2008

Science
Thanks DrBob :)
September 23, 2008

Science
road salt has been dropped on grass. keep osmosis in mind, what would happen? answer: since the road salt is hypertonic solution and therefore the water in the grass would diffuse into the road salt thus causing the grass to die. Is this right? What should I add?
September 23, 2008

last question sci. :)
road salt has been dropped on grass. keep osmosis in mind, what would happen? answer: since the road salt is hypertonic solution and therefore the water in the grass would diffuse into the road salt thus causing the grass to die. Is this right? What should I add?
September 23, 2008

biochem.
why is it important for the intravenous fluids to have the same solute concentration as your blood? Answer: If the intravenous fluids did not have the same solute concentration, then the red blood cells would shrink, if the intravenous fluids were hypertonic or they would ...
September 23, 2008

science
why is it important for the intravenous fluids to have the same solute concentration as your blood? Answer: If the intravenous fluids did not have the same solute concentration, then the red blood cells would shrink, if the intravenous fluids were hypertonic or they would ...
September 23, 2008

science
ok works for me thank you :)
September 23, 2008

science
so would it be better to place a wilted flower in tap water or distilled water? Answer: I would say distilled water because it contains a lower cocnentration of solute than the flower and therefore the water would more easily diffuse into the flower. Tap water contains things ...
September 23, 2008

SCI
both of these sites say use either distilled water or tap water. :S But i`m trying to figure out which is best.
September 23, 2008

SCI
so would it be better to place a wilted flower in tap water or distilled water? Answer: I would say distilled water because it contains a lower cocnentration of solute than the flower and therefore the water would more easily diffuse into the flower. Tap water contains things ...
September 23, 2008

SCI
ok I understand thank you :)
September 23, 2008

SCI
Hypothetically speaking, I placed a cell in a glass of water and after about a day the cell grew in size. Why did the cell grow? Well I was thinking this: The reason the cell grew was because there was a higher concentration of water outside of the cell and therefore -in order...
September 23, 2008

sci.
Thank you so much. I finally understand this. :)
September 23, 2008

sci.
I`m so confused about osmosis right now. If you place a cell in a hypertonic solute then wouldn`t the water go into the cell since they`re trying to acheive equilibrium?
September 23, 2008

bob -sci.
keeping osmosis in mind, would it be better to soak wilted flowers in distilled water or normal tap water? I was thinking tap but I`m not sure why I`m thinking that. Maybe because tap water has a higher solute concentration that than distilled. i`m not sure. could you explain ...
September 23, 2008

sci.
keeping osmosis in mind, would it be better to soak wilted flowers in distilled water or normal tap water? I was thinking tap but I`m not sure why I`m thinking that. Maybe because tap water has a higher solute concentration that than distilled. i`m not sure. could you explain ...
September 23, 2008

science
Thanks Dr. Bob :)
September 8, 2008

science
when you eat to much, like more than your need, the mitochondria in your liver makes triglycerides to store the excess. Why is that storagge important? :S
September 8, 2008

Bio
What are the similarities and differences between fatty acids and polysaccharides?
September 8, 2008

Sci
Thanks You :)
September 3, 2008

Sci
Thank you so much :)
September 3, 2008

Sci
What are the 5 signs that show a chemical change has taken place? I wrote: - theres a smell of ordur - change in color - fizzing or bubbling - percipitate forms - difficult to reverse Could you name a couple more please and tell me if those are right. Thank you.
September 3, 2008

science
try typing something like: dangers of carbon dioxide to human health into a search engine
September 3, 2008

science
- Asphyxiation. Caused by the release of carbon dioxide in a confined or unventilated area. This can lower the concentration of oxygen to a level that is immediately dangerous for human health. - Frostbite. Solid carbon dioxide is always below -78 oC at regular atmospheric ...
September 3, 2008

science
natural sources: - burning of fossil fuels - volcanic eruptions - decay of plant and animal matter - resperation
September 3, 2008

Sci
blood
September 2, 2008

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