Wednesday
July 30, 2014

Posts by Anna


Total # Posts: 1,925

physics
write down the uncertainty in the volume of the cylinder that you calculated in part 4 of the error analysis (i got 3.36*10^-2). Also write down the minimum uncertainty with which the volume of the cylinder can be determined. Compare these two values and discuss briefly.

chem plzzz help
okay so im doing pre lab questions on reaction rates I have a chart labeled effects of varying concentration in reaction #1 flask A contains 7.50mL of .200 M KI , none of .20M KCI, 5.00 mL of .0050 M S2O3^2-, 1 drop of starch. Flask B contains 7.5mL of .100M S2O8^2- It says fo...

chemistry
how do you make 0.2M KI from 2M KI, what is the procedure?

chem
If .275 moles of ferrous ammonium sulfate and an excess of all other reagents are used in a synthesis of K3[Fe(C2O4)3]*3H2O, how many grams of product will be obtained if the reaction gives a 53% yield? Can you plz explain to me in steps

chem
Calculate the molar mass of K2[Cu(C2O4)2]*2H2O I got 353.81 is this correct ?

general science
This gas is principally shipped and used in gaseous form for excimer lasers, light bulbs, window insulation, ion propulsion, medical applications and laboratory R & D.

general science
How many electron rings does carbon have?

AP Chem
In a typical synthesis reaction, 0.142 g of chlorine gas is reacted with an unkown elemnt X to form a compound with the formula XCl3. If the final product has a mass of 0.178 g, what is the atomic mass of the unknown element?

Basic Biology
What is the process by which oxgen get into the blood in the capillaries?

science
i do not understand how to answer the question if it has (N) instead if saying (kg) how would i answer, and the question is.: if the net force is 100N, and the acceleration is 5m/s squared how much mass am i moving? please answer soon!! Thank You!!

Biology
those were three different questions. which one was the answer for?

biology
for which question? i think there's more than one answer for each, though i'm not sure.

biology
Which have cells walls? (more than one may be correct) A)chilomonas B)volvox C)peranema. Which have chloroplasts? (more than one may be correct) A)Paramecium B)Amoeba C)chilomonas D)volvox E)peranema

Fine Arts
could you provide a link to the painting/sculpture?

Biology
What are two types of materials or observations that would necessitate the use of the stereoscopic microscope? What organelles are visible with the electron microscope but not with the light microscope? (we've been studying single celled organisms and organelles).

algebra
can't be done. unless you have more information?

Biology
Which of these organisms have cell walls? Which have chloroplasts? Describe their organization. Paramecium Amoeba Chilomonas Volvox Paranema I've tried searching on the web, but the pages don't mention chloroplasts or cell walls. Which means they either don't have ...

Biology
What are two types of materials or observations that would necessitate the use of the stereoscopic microscope? What organelles are visible with the electron microscope but not with the light microscope? (we've been studying single celled organisms and organelles).

Biology
Which of these organisms have cell walls? Which have chloroplasts? Describe their organization. Paramecium Amoeba Chilomonas Volvox Paranema

English
Is house trained hypenated? Also are laid-back and low-key hypenated?

english
When using plural possessives, do you make the noun afterwards plural? For example: Many families own pets which live in their homes. or Many families own pets which live in their home.

algebra
hi. I'm expected to solve (27ab^3)^1/3 times the sq. root of (there is a three in the nook of the square root) 5a^4b. I follow it until it reduces to the square root of (still with the three in the nook), 3^3a^3b^3 times 5 a^2 b. Where does the three on the first a randoml...

Algebra 2
f(x)={-x+3, if x <1

Algebra 2
f(x)={-x+3, if x <1

physiology
starvation decreases metabolic rate by as much as a. 10% b.20% c. 40% d.65%

physiology
starvation decreases metabolic rate by as much as a. 10% b.20% c. 40% d.65%

science
how are the physical, chemical, and biological characteristics of a stream system changed as stream order increases?

Math
Thank you!!

Math
Sorry... the function is: P = 11 + 44 1n x

Math
Suppose that the function represents the percentage of inbound e-mail in the U.S. that is considered spam, where x is the number of years after 2002. Use this model to approximate the percentage of spam in the year 2006 to the nearest tenth of a percent. Please show work.. Tha...

5th grade
i dont know either and i need to know to help my daughter!!

5th grade
i dont know either and i need to know to help my daughter!!

Sentence Editing
For example, a female may make her eyes appear rounder by completely outlining her eye to both corners, more oval by lining the top lid thicker in the middle, or larger by finely lining the bases of both the upper and lower lashes. I want to put "than before" in ther...

Algebra
6000 = 200(t) Please help me solve this equation, and show the work... Thank you!!!

Algebra
Please solve the Linear Equation of P = 200(10)+6000 Please show work in all steps

health
What are the five stages of a human's life cycle?

1st grade
get a life you dork

Business mangement and leadership
Read through the 12 principals for Manging Change .Then select three principals you feel are most important to follow when managing and describe why you feel these are essential. Describe some specific techniques that can be used to manage change in an organiziation. explain h...

Religions of the World.
how do you explain the diffrent forms of the main Asian religions which exist ?

ochem
propose structual formulas for pheophytin a and pheophytin b

Essay Writing
So everything else doesn't have to be parallel like needs and personalities and cats and dogs aren't gerunds but thats ok since they are a different part of the outline?

Essay Writing
I need help with parallel structure. My essay is contrasting cats and dogs, with cats being the superior (sorry dog lovers). One paragraph is to be block method the other is to be point by point. II. Body A. Needs 1. Feeding a. Cats b. Dogs 2. Training a. Cats b. Dogs 3. Groom...

Essay Writing
I need help with making my outline parallel. II. Body A. Needs 1. Feeding a. Cats b. Dogs 2. Training a. Cats b. Dogs 3. Grooming a. Cats b. Dogs 4. Medicating a. Cats b. Dogs B. Personalities 1. Cats a. Playing b. Vocalizing c. Independence

math
the formula is that you add 5+9= 14 divide 120/14 and I keep getting a decimal, and then you would multiply that number by 5 and 9, and when those 2 numbers add up it would equal 120.. I just cant seem to figure this out though

math
Mix B= 5 cups of fruitjuice ; 9 cups of soda For this mix how much fruit juice and how much soda are needed to make punch for 240 people( each person gets half a cup of punch)

AP Chem
87. At what temperature would CO2 molecules have an rms speed equal to H2 molecules 25 degrees C? First I got the rms of H2 to be 1927.3 by taking u= sq root (3*8.31*298)/(.002 Then I tried to find the temp of CO2 by using 1927.3 sq root .044/ sq root (3*8.31) and I got 81.0 K...

chemistry
I'm not sure, but I think if you had lemonade with pulp it would be a heterogenous mixture because the mixture would not all look the same; you would have the liquid and the pieces of pulp.

Life Science
chloroplasts

7th Grade Math
first subtract 11 from both sides you get z/6 > -60 then multiply both sides by 6 you get z > -120

Eighth Grade Science
a temperature can't be celsius and K at the same time. which one is it?

Molecular Speeds
My work: At 25 degrees C u= sq rt. (3 * 8.31 * 298)/(2.80*10^-3km/mol) u= 16.3 m/s^2 At 125 degrees C u= sq root (3*8.31*398)/(2.80*10^-3km/mol) u= 18.8 m/s^2 those answers are wrong. and i don't know how to do the graph

Molecular Speeds
Can someone just work me through how to do this one problem? I should be OK on the rest then. Calculate the rms speeds of N2 molecules at 23 degrees C and at 125 degrees C. Sketch the approximate curves of the molecular speed distributions of N2 at 25 degrees C and 125 degrees...

AP Chem
Oh, I think I got it. Is it only when the gas is collected OVER water?

AP Chem
When dealing with gasses, do you subtract the pressure of water vapor every time it is in the equation? I'm confused on when you subtract it. Such as this problem... NH4NO2(s) -> 2H2O(g) + N2(g) How many grams of ammonium nitrate must have reacted if 3.75 dm^3 of nitrog...

AP Chem
Would someone please check these for me? 52. In an experiment, you fill a heavy-walled 5.00-L flask with methane gas, CH4. If the flask contains 7.13 g of methane at 19 degrees C, what is the gas pressure? 2.14 atm 56. A 2.50-L flask was used to collect a 5.65-g sample of prop...

preschool
obvisley cause It is preschool

Spanish
I tried and failed miserably. I have no idea whether to use preterite or imperfect but I can send you what I attempted. 1. Eran las tres cuando ella levanto para empezar el dia. 2. Mientras Philip fried (I don't know the word for fried) las papas en aceite, Elena paso la a...

Spanish
Thank you so much! I have a PC. Sorry I didn't have the accents but I don't know how to do them on the computer. :(

Spanish
Okay that's all of them Sra. If it is possible can you please check my work and help me figure out the words I did not know?

Spanish
I tried and failed miserably. I have no idea whether to use preterite or imperfect but I can send you what I attempted. 1. Eran las tres cuando ella levanto para empezar el dia. 2. Mientras Philip fried (I don't know the word for fried) las papas en aceite, Elena paso la a...

Spanish
Can you please help me translate these sentences using preterite vs. imperfect? 1. It was three o'clock when she got up to start the day. 2. While Philip fried the potatoes in oil, Elena vaccumed the living room. 3. Before leaving, I turned off the lights and closed the do...

8th grade science
ya so Get over the Fact u cant get a life drop out of school.

Chem
81. Formic acid HCHO2, is a convenient source of small quantities of carbon monoxide. When warmed with sulfuric acid, formic acid decomposes to give CO gas. HCHO2(l) -> H2O(l) + CO(g) If 3.85 L of carbon monoxide was collected over water at 25 degrees C and 689 mmHg, how ma...

AP Chem
Phosphorus pentachloride is a white solid that sublimes (vaporizes without melting) at about 100 degrees C. At higher temperatures, the PCl5 vapor decomposes to give phosphorus trichloride and chlorine. How could gas-density measurements help to establish that PCl5 vapor is de...

AP Chem
Ammonium Chloride is a white solid. When heated to 325 degrees C, it gives a vapor that is a mixture of ammonia and hydrogen chloride. Suppose someone contends that the vapor consists of NH4Cl molecules rather than a mixture of NH3 and HCl. Could you decide between these alter...

AP Chem
Phosphorus pentachloride is a white solid that sublimes (vaporizes without melting) at about 100 degrees C. At higher temperatures, the PCl5 vapor decomposes to give phosphorus trichloride and chlorine. How could gas-density measurements help to establish that PCl5 vapor is de...

AP Chem
Ammonium Chloride is a white solid. When heated to 325 degrees C, it gives a vapor that is a mixture of ammonia and hydrogen chloride. Suppose someone contends that the vapor consists of NH4Cl molecules rather than a mixture of NH3 and HCl. Could you decide between these alter...

AP Chem
Help with these two please. 105. A radioactive metal atom decays (goes to another kind of atom) by emitting an alpha particle (He+2 ion). The alpha particles are collected as helium gas. A sample of helium with a volume of 12.05 mL was obtained at 765 mmHg and 23 Degrees C. Ho...

AP Chem
I thought that you always had to use atm in the equations.

AP Chem
Can someone please check these problems? 34. You fill a balloon with helium gas to a volume of 2.68 L at 23 degrees C and 789 mmHg. Now you release the balloon. What would be the volume of helium if its pressure changes to 632 mmHg but the temperature is unchanged? 3.35 L 38. ...

Math
I think it would be 28/100. Because if 72/100 is used for work then the rest of that would be 100-72 which is 28. And percents are over 100.

Chem
Can someone check these homework answers please? 32. The barometric pressure measured outside an airplane at 9 km was 259 mmHg. Calculate the pressure in kPa. 34.5 kPa 36. A diving bell is a container open at the bottom. As the bell descends, the water level inside changes so ...

Biology
One of the structures a cell uses to live,grow,and reproduce

Investments/Portfolio Mgt
How would the following be solved... Consider a risky portfolio. The end-of-year cash flow derived from the portfolio will be either $50,000 or $150,000, with equal probabilities of 0.5. The alternative riskless investment in T-bills pays 5%. a. If you require a risk premium o...

History- The Constitution
How does the elastic clause keep the Constitution "alive"? Give two examples of checks and balances.

chem
thank you

chem
What is the relationship between kPa and atm when dealing with measurements of pressure of a gas?

chem
A vessel containing 39.5 cm^3 of helium gas at 25 degrees celsius and 106 kPa was inverted and placed in cold ethanol. As the gas contracted, ethanol was forced into the vessel to maintain the same pressure of helium. If tihs required 7.7 cm^3 of ethanol, what was the final te...

AP Chem
ooh ok that explains it lol thanks =]

AP Chem
I did that and got -22.7. 1st of all the answer is supposed to be .65 L 2nd of all where does the negative go?

AP Chem
Helium gas, He, at 22 degrees C and 1.00 atm occupied a vessel whose volume was 2.54 L. What volume would this gas occupy if it were cooled to liquid-nitrogen temperature (-197 degrees celcius). What is the equation?

other
i have four legs but can stand on one, i come out in the daylight but not in the sun. i have two sisters who our in power, my grandmother looks like a natural flower. some say im old but i feel like new, i stick to the bottom of your shoe! what am i?

Essay
I wrote an essay of examples on how cosmetics produce a flawless face. The title I came up with is Fixing Feminine Features. I don't know if I like it of not, but I wanted to do something that caught attention. Any tips?

AP Chem
A sample of H2 is collected by displacing 145 mL of water. The pressures of the gas and the atmosphere are equalized. The atmospheric pressure is 745 mmHg. The temperature of the water and gas are identical at 26 degrees C. How many moles of H2 have been evolved?

AP Chem
A solution of hydrogen peroxide, H2O2, is titrated with a solution of potassium permanganate, KMnO4. It requires 51.7 mL of 0.145 M KMnO4 to titrate 20.0 g of the solution of hydrogen peroxide. What is the mass percentage of H2O2 in the solution? If you want the whole equation...

AP Chem
Thanks for walkin me through that one =]. It helped a lot with the other problems like that too.

AP Chem
A chemist added an excess of sodium sulfate to a solution of a soluble barium compound to precipitate all of the barium ion as barium sulfate, BaSO4. How many grams of barium ion are in a 458-mg sample of the barium compound if a solution of the sample gave 513 mg BaSO4 precip...

PIGSKIN GEOGRAPHY
WHAT KIND OF GRAINS ARE IN CEREAL BESIDES CORN, WHEAT, AND OATS?

AP Chem
I divided by 111.1. Our teacher likes us to use 3 digits when using atomic weight.

AP Chem
Oh wait, is this one like the last one I asked for? I didn't work that one out yet.

AP Chem
An aqueous solution contains 4.50 g of calcium chloride, CaCl2, per liter. What is the molarity of CaCl2? When calcium chloride dissolves in water, the calcium ions, Ca^+2, and chloride ions, Cl^-, in the crystal go into the solution. What is the molar concentration of each io...

AP Chem
A 3.50 g sample of KCl is dissolved in 10.0 mL of water. The resulting solution is then added to 60.0 mL of a 0.500 M CaCl2(aq) solution. Assuming that the volumes are additive, calculate the concentrations of each ion present in the final solution. *confused*

AP Chem
Yes, thank you. I was trying to do the equation like it was a carbonate that produced carbon dioxide, not as an acid.

AP Chem
Complete and balance each of the following molecular equations, including phase labels, if a reaction occurs. Then write the net ionic equation. If no reaction occurs, write NR after the arrow. H2CO3(aq)+Sr(OH)2(aq) -> this is what I put but I think its wrong H2CO3(aq)+Sr(O...

Square Root Help!!! Urgent:)
1. 4 times squareroot 10 2. 3 times squareroot 11 3. 13 4. 2 times squareroot 3

algebra
how would you factor 25z^2 + 16

Math
subtract .2b from both sides. 0.3b + 3.4 = 12.4 subtract 3.4 from both sides 0.3b = 9.0 divide both sides by 0.3 b= 30

trig
what is the inverse tangent of (rad3/3)?

trig
inverse cos (-rad2/2)=135 degrees inverse sin (-rad2/2)=-45 degrees I dont understand why cos is 135

Math
d

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