Wednesday
April 23, 2014

Posts by lena


Total # Posts: 992

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....

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

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?

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

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 a...

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?

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

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.

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...

Computer
Thank you :)

Computer
How do you download a video from youtube into your my documents?

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?

Bicarbonate
Thanks Sra :)

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?

Biology
Thank you :)

Biology
where does the small intestine connect to the large intestine?

Biology
Thanks Dr Bob :D

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

Biology
Thanks Ms. Sue but I still can't seem to find them.

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.

Chem.
Thanks so much Dr Bob You helped so much Thanks

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?

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?

Chem.
I need pure silver so just Ag on it's own.

Chem.
thanks

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

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?

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.

Chem.
but it would be very close to 7 though. right?

Chem.
ok thanks DrBob :)

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

Chem.
How would one cheak if the water they are drinking is clean?

10th grade
7x+11y=-5

Microsoft Publisher
Thanks :)

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?

Math
Thanks :)

Math
Oops :O Thanks

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

Law
Thanks so much :)

Law
What is peaceful assembly?

English
could you give me an example of the literary term Conflict!?

Law
Thanks :)

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

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?

Canadian Law
thanks :)

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 thoug...

Law
Thanks :)

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?

Law
Thanks Ms. Sue :D

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?

Chemistry
Thanks Dr. Bob :)

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 - ...

Chemistry
Thanks so much !

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 %

Chemistry
Thanks :)

Chemistry
Thanks :)

Chemistry
What does a negetive percentage error mean?

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

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?

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 ...

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?

Genetics
Whats a homolog?

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

BIO
Thanks so much :)

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>?

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.

math
how do i solve systems of three equations with elimination??

law
what should someone do after being sexually assulted?

Law
thank you

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.

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.

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

Science
Thanks DrBob :)

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?

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?

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 expa...

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 expa...

science
ok works for me thank you :)

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 ...

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

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 ...

SCI
ok I understand thank you :)

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...

sci.
Thank you so much. I finally understand this. :)

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?

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 ...

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 ...

science
Thanks Dr. Bob :)

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

Bio
What are the similarities and differences between fatty acids and polysaccharides?

Sci
Thanks You :)

Sci
Thank you so much :)

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.

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

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 pre...

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

Sci
blood

Sci
What would happen if our pH levels increased?

Chemistry/pH- Weak Acid
where did you get c = 1.00x10^-2 = 0.0100 M from ?

English
Thanks so much Ms. Sue. I finally understand the purpose of semi-colons.

Pages: <<Prev | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | Next>>

Search
Members