Friday

April 18, 2014

April 18, 2014

Total # Posts: 211

**chemistry**

you have a metal tank containing 74.0moles of nitrogen gas at a pressure of 15.0atm.If the pressure is measured at a temperature of 20.0c,then the volume of the tank must be how many liters(Round answer to one decimal place.

**Chemistry**

when the pressure on 2.5liters of oxygen is decreased from 2.0atm to 1.0atm,the volume of the gas becomes how many liters.(round answer to one decimal place.

**Patterns,Algebra ans Functions**

This line represents the line on a graph tha shows how long it took Khalil to walk to school.The horizontal axis shows the time and the vertical axis shows blocks covered.Explain what you think happened on Khalil's way to school?

**business math**

mary smith purchased a new car for $28,750. she made a 15% down payment and financed the balance at her bank for 3 years. what payments are required at the end of every month, at 18% interest, to pay off the loan?

**asking for a teacher's opinion**

Do you think rounding borderline letter grades up or down is a fair practice? Or should they just stay where they are? For example, I think that an 89.5% should round up to a 90%. I have one instructor right now who considers an 89.99% to still be a B plus. It seems a bit asin...

**physics**

If motor M exerts a force of F=(10t2+100)N on the cable, where t is in seconds, determine the velocity of the 25kg crate when t=4s . The coefficients of static and kinetic friction between the crate and the plane are μs=0.3 and 0.25 μk=0.25 . The crate is initially a...

**math modeling**

A spherical balloon has a radius of 11 centimeters. If we increase the radius by 2 centimeters, how much did the volume increase?

**Analytical chemistry**

Thank you very much!

**Analytical chemistry**

I did the next problem, i don't have the results for it and i just want to know if i calculated the mass for Fe2O3 the right? A sample is a mixture of iron oxides (Fe2O3 and FeOOH). It's known that at 200°C this reaction occurs: 2FeOOH(s)-> Fe2O3(s) + H2O(g) A 0...

**Analytical chemistry**

What is a pH of 20 mL of 0.08 M NH3 added to 40 mL of 0.04 M HCl? NH3 + HCl = NH4+ + Cl- c(NH3)=(0.02L * 0.08M)/0.06L= 0.02667 M c(HCl)=(0.04L * 0.04M)/0.06L= 0.02667 M c(NH4+)=c(HCl) Kb=[NH4+][OH-]/[NH3] Kb=1.76*10^(-5) So i tried to calculate it like this: Kb=[OH-] pOH=4.754...

**chemistry**

you will have to use this two formulas p*V=n*R*T n=m/M p*V=(m/M)*R*T p*V*M=m*R*T M=(m*R*T)/P*V then just make sure you convert units right (i hope i did convert them right, if not then correct me) M=(0.311g*8.314L kPa*328.15K)/(mol*K*118.124 kPa*0.225L) M=31.924 g/mol

**Chemistry**

NaHCO3 + HCl -> NaCl + CO2 + H2O n(NaHCO3)=n(HCl) n(NaHCO3)=m/M=2.3g/83.99*(g/mol)=0.027384 mol m(HCl)=n*M m(HCl)=0.027384 mol * 36.46 (g/mol)= 0.9984 g

**Analytical chemistry**

First of all, thank you so much for answering and i'm sorry for writting all the problems at once. I won't do that anymore in the future. #5 i was looking at the different problem with my result, that's why i wrote the concentration :S #9 thank you, i just realized...

**Analytical chemistry**

Below i wrote a few problems, i did them all but in the book i don't have results, so i don't know if i did them right or not. I would really appreciate if someone would go through the problems and tell me if i got the right results. If i made a mistake somewhere pleas...

**Analytical chemistry**

Maybe there was a mistake in the book, because i always get the result higher than 100%

**Analytical chemistry**

It's ok. Thank you for the help.

**Analytical chemistry**

That was all that was given

**Analytical chemistry**

The iron in a 0.6656 g ore sample was reduced quantitatively to the +2 state and then titrated with 26.753 g of KMnO4 solution. Calculate the percent Fe2O3 in the sample. the mass i get for fe2o3 is too big, but i don't know how else to do this problem, someone please help...

**Analytical chemistry**

thank you so much, again :)

**Analytical chemistry**

A Kjeldahl analysis was preformed upon a 0.055 g sample of impure biguanide (C2H7N5, fw=101.1). The liberated ammonia, collected in 40 mL of 4% boric acid was titrated with 19.51 mL of 0.1060 M HCl. Calculate the percentage of biguanide in the sample. (Result: 76%) This is how...

**Analytical chemistry**

Thank you both so much

**Analytical chemistry**

A dilute perchloric acid solution was standardized by dissolving 0.2445 g of primary standard sodium carbonate in 50 mL of the acid, boiling to eliminate CO2, and back-titrating with 4.13mL of dilute NaOH. In a seperate titration a 25mL portion of the acid required 26.88 mL of...

**Analytical chemistry**

Thank you very much for your help :)

**Analytical chemistry**

A 5ml portion of table wine was diluted to 100 ml in a volumetric flask. The ethanol in a 20 ml aliquot was distilled into 100 ml of 0.05151M K2Cr2O7. heating completed oxidation of the alcohol to acetic acid: Ch3Ch2OH + 2Cr2O7(2-) +16H(+) -> 3Ch3COOH + 4Cr(3+) + 11H2O foll...

**Analytical chemistry**

Thank you so so so much! You're great!

**Analytical chemistry**

A 25 ml sample of household bleach was diluted to 500 ml in a volumetric flask. An unmeasured excess of potassium iodide was aded to a 20 ml aliquot of the diluted sample; the iodine liberated in the reaction: OCl- + 2I- -> I2 + Cl- + H2O required 34.5 ml of 0.0409 M Na2S2O...

**math**

a particle moves along the x-axis so that its velocity is proportional to x^2. Prove that its acceleration is proportional to x^3

**substance**

10-15 lines critically discuss 5 ways in which the human problem impacts on the community

**nutrition**

5 ways in which human or environmental problem impacts on the community

**health**

name 5 ways which human or environmental problem impacts on the community

**Algebra 1**

If the side of a rectangle measures 10.5 cm to the nearest millimeter,what is the upper bound and lower bound of the side of the rectangle?

**medical terminologhy**

combining form and suffix to form number 1 abnormal softining of a kidney

**life orientation**

.working almost 50 hours per week. .working on holidays without extra remuneration. .working during lunch break in order not to lag behind with the work. .going to work when you are ill. .giving some employees a work wich is not their duties.

**math 5th**

steve wants to make a rectangular pen for his guinea pig with 20 yards of fencing. what is the greatest area the pen can have

**Science**

State in words the specific information conveyed by a label reading 0.25M Oxalic acid.

**history**

11. What geographic feature at times made life difficult for the Moche of South America?

**Chemistry **

When 50.0g of silicon dioxide is heated with an excess of carbon 32.2 g of silicon carbide I'd produced. SiO2(s) + 3C(s) → SiC(s) + 2CO(g) A. What is the percent yield of this reaction? B. How many grams of CO gas are made?

**Jefferson **

Nitric acid and zinc react to form zinc nitrate, ammonium nitrate, and water. 4Zn(s) + 10HNO3(aq)→ 4Zn(NO3)2(aq) + NH4NO3(aq) + 3H2O(l) A. How many atoms of zinc react with 1.49g HNO3? B. Calculate the number of grams of zinc that must react with an excess of HNO3 to for...

**Math**

Three people who work full-time are to work together on a project, but their total time on the project is to be equivalent to that of only one person working full-time. If one of the people is budgeted for one-half of this time to the project and a second person for one-third ...

**pre algebra**

Actual train size 40 feet gives a model size of 3 inches which scale was used?

**Physics**

a car that weights 15000 N is initially moving at 60 km/hour when the brakes are applied. The car is brought to a stop at 30 meters. Determine the magnitude of the braking force

**adverbs and other parts of speech**

This question is based on the following paragraph. (1) Brenda would have liked to have taken her vacation at the beach. (2) However, the weather forecast on the television called for rain. (3) Also, her fiancé, Max, wanted to vacation in the mountains. (4) After a heat...

**adverbs and other parts of speech**

3. Which one of the following sentences does not contain a prepositional phrase?

**the parts of speech**

noun

**the parts of speech**

10. In the following sentence, identify the part of speech of the italicized word. Catching fish is one of the oldest pastimes.

**Geology**

Wood fragments from the floor of a palace in Syria - Syro-Hittite period. Date: 675 ± 50 years BCE

**chem**

What mass of H2C2O4 can react with 35.0 mL of 1.50 M KMnO4 according to following equation?

**chemistry**

what is the molarity of a solution prepared by dissolving 63.0 g NaF in enough water to make 250.0 mL of solution?

**chem**

what is the mass in grams of the following 6.78 mol of NaI

**world history**

14. The Emperor Charlemagne spread Christianity among the Saxons by

**chemistry**

Okay thank you, and what about oxygen? Do i do anything with oxygen?

**chemistry**

I know how to find the empirical formula if you find the moles of each element. I am unsure about what to do when given compounds. How do I find how many moles there are of carbond and hydrogen?

**chemistry**

In 1934, Edward A. Doisy of Washington Univeristy extracted 1361 kg og hog ovaries to isolate a few milligrams of a potent female hormone. Doisy burned 5.00 mg of this precious sample in oxygen and found that 14.54 mg of CO2 and 3.97 mg of H2O were generated. (a) determine the...

**aed204**

top ten charactertistics of multiculturlal school

**intentive spellers typically**

a. write only words they are certain can be spelled corrctly. b. never learn conventional spelling c. omit consonants in words d. Progress through a serious of stages

**science**

100

**math **

waiting for my answer on the ageprime factors

**math**

The ages of a population of 300 is normally distributed, with a mean of 45 and a standard deviation of 4. If you randomly selected a member of the population, what is the probablity that his or her age would be greater than 49?

**math**

Solve for x. 3ln(x)-2=16+7ln(e)

**math**

The sum of the first 5 natural numbers is 15 or (5)(6)/2. The sum of the first 21 natural numbers is 231=(21)(22)/2, and the sum of the first 30 numbers is 465. Use inductive reasoning to derive the formula for the sum of the first n natural numbers.

**math**

In a group of 7 men and 8 women, how many committees of 5 can be selected for which there are 2 men and 3 women? What is the probability of selecting a committee of 5 consisting of 2 men and 3 women?

**math**

What is the probablity of getting at least one head as a result of flipping 6 fair coins?

**math**

What is the value of an initial investment of $2300 after twelve years if the interest accrued is compounded quarterly, and the annual rate is 6.5%?

**statistics**

1- The ages of a population of 300 is normally distributed, with a mean of 45 and a standard deviation of 4. If you randomly selected a member of the population, what is the probablity that his or her age would be greater than 49?

**calculus**

f(x)= (5x^4 + 5x^3 + 6x^2 + 8x + 5)/(1x^4 + 1x^3 + 1x^2 - 9x + 4) What is the equation of the horizontal asymptote? y = ___? Does the graph of f(x) intersect its horizontal asymptote? (yes or no) If yes, at what x-values does f(x) intersect its horizontal asymptote? Give your ...

**Calculus**

f(x)= (-5x^3 + 3x^2 + 3x -5)/(-8x^2 +2x + 7) Find the equation of the non-vertical asymptote. y = ? Does f(x) intersect its non-vertical asymptote? (yes or no) If yes, what is the smallest value of x at which f(x) intersects its non-vertical asymptote?

**calculus**

Leave any unneeded answer spaces blank. [Hint: use synthetic division to solve.] f(x) = (1x^3 - 3x^2 - 25x + 75)/(1x^3 - 19x^2 + 118x - 240) the roots of f(x), in increasing order is/are.... ___, ___, ___ f(x) has holes when x is... ___, ___, ___ f(x)has vertical asymptotes wh...

**computer science**

Promotion time is coming around the corner. In the last board meeting, your supervisor has asked someone to create a list of tables for a Fernandos Skate Shop customer orders. Use the following preliminary field list and list of subjects to get started. Realize that the lists ...

**phi103**

i will define abortion for my introduction

**phi103**

introduction on should abortion be legal?

**phi103**

should abortion be legal i need a thesis statement and introduction

**phi103**

need a thesis statement on abortion

**PhI 103**

what kinds of mistakes might they makewithout having been exposed to a careful study of reasoning provided by logic?

**PHI103**

is it important for people to study logic

**pHI 103**

imagine someone asks you what you learned in your logic classand what you found to be the most useful information you learned there?

**phl103**

give me the answer for week-5

**phl103**

Write the arguments in symbols using sentence letters and truth, functional connective

**phi103**

ourarguments? Are there disadvatages to using this technique to make the structure of our arguments more explicit and clear?

**databases**

Fernando Cilebra has always ben facinated by skateboards. Fernando has won several contests, both locally and nationally. His interest in skateboards led him to open Fernando's Shop in Denton, Maine. Fernando sells street, trick, and children's skateboards. The store h...

**algebra**

Betty is 6 years older than Deb. 13 years ago, Betty was 4 times older than Deb. How old is Deb?

**algebra**

If one runner can run 10 meters in one second and another runner can run 6 meters in one second and the slower runner is given a 70 meter head start, how long will it be before the faster runner catches the slower runner?

**math**

Since it is an estimate, round 72 to 70 and 96 to 100 and multiply. The answer would be 7,000.

**PHI 103**

What kinds of questions and topics are not decided by logical analysis?

**PHI 103**

Explain what logic can and cannot do?

**PHI 103**

Explain what advantages we obtain by studying logic in terms of improving our reasoning.

**PHI103**

i need a thesis statement on should abortion be legal i needs some reference on should abortion be legal

**science**

give me the quiz for week-3 sci207

**science**

as we reach a possible peak in oil production, what alternatives are forming?

**science **

could you help me with my outline paper on water cycle have tohave a outline

**science**

in chapter six of contemporary enviromental issues, the past century has been referred to as the Age of oil. As we reach a possible peak in oil production, what alternative, are forming? Consider the role of OPEC, perhaps,in reorganizing and monitoring oil production. What do ...

**science**

the global water cycle provides renewable water, but a number of factors affect how much freshwater is available for human consumption. Describe these factors and circumstances. When do human interventions in water avaliabity pose serious problems to accessibility

**science**

based on your knowledge of environmentalscience, what could explainthese observation? Support your answer with specific results from your data and ideas fromyour readings

**science**

do your result indicate thatanyof thespecies are keystone species?

**science**

what do recommend to Pinchot as " a sustainable " level of fragmentation that conserves the forest's biodiversity and ecosystem services while still allowing for some development?

**science**

according to the scenario, your results and the readings,how might the environments impacts of deforation and sprawl affect the human community of pinchot?

**science**

do your results support idea that trophic cascades occur in nature?

**algebra**

A cylindrical oil tank is 2/5 full. If 9 more liters are added, the tank will be 5/8 full. What is the capacity of the tank?

**Comunity school**

When using fraction strips, how do you know that two fractions are equivalent?

**Math 104**

Determine the comparable interest rate for a $70,000 loan when the quoted information is 12.4% + 0.5 pt + $300. (Round your answer to two decimal places.)

**Math Grade 3**

wriring in math explain how you can estimate to tell wether 433-147=285 is reasonable