Friday
April 18, 2014

Posts by brittany


Total # Posts: 823

Chemistry
What is the root-mean-square speed of N2O at 25°C?

Chemistry
The density of an unknown gas is 1.72 g/L at 750.0 torr and 30.0°C. Which of the following could be the unknown gas? a. CS2 b. NO c. N2O d. NH3 e. N02

Chemistry
Which of the following reactions will result in a reduced total pressure? a. CH4(g) + 2O2(g) → CO2(g) + 2H2O(g) c. 2HI(g) → H2(g) + I2(g) b. 2N2O(g) → 2N2(g) + O2(g) d. 2H2(g) + O2(g) → 2H2O()

Chemistry
How many moles of propane are contained in a 5.00 L tank at 450 torr and 25°C?

Chemistry
In an experiment, 25.0 mL of a gas with a pressure of 1.00 atm is contained in a balloon at 25.0°C. The balloon is then cooled to 5.0°C, and the pressure is found to be 0.750 atm. What is the volume of the gas under the new conditions?

Chemistry
Iron(III) oxide reacts with carbon monoxide gas to form solid iron metal and carbon dioxide gas: Fe2O3 + 3 CO --> 2 Fe + 3 CO2 If you begin the reaction with 84.34 g of iron(III) oxide and 68.87 g of CO, which reactant will be in excess at the end of the reaction and how ma...

Chemistry
Which one of these samples contains the smallest number of molecules? a. 1.0 L of H2 at STP (0°C and 1atm) d. 1.0 L of N2 at 0°C and 800 torr b. 1.0 L of N2 at STP e. 1.0 L of He at STP c. 1.0 L of H2 at 20°C and 760 torr

Chemistry
Methanol (CH4O) is converted to bromomethane (CH3Br) as follows: CH4O + HBr --> CH3Br + H2O If 12.23 g of bromomethane are produced when 5.00 g of methanol is reacted with excess HBr, what is the percent yield?

Childhood Education
How does poverty relate to a child's risk for inadequate health and well-being?

Childhood Education
What items would you first look for to determine whether lead is present in the environment where children are present?

Childhood Education
Can anyone answer this question? Compare the environment for toddlers with one suitable for infants. How are the areas similar? How are they different?

Childhood Education
Compare the environment for toddlers with one suitable for infants. How are the areas similar? How are they different?

Childhood Education
Compare the environment for toddlers with one suitable for infants. How are the areas similar? How are they different?

Organic Chemistry
An expanded structural formula shows all the atoms of the molecule and all the bonds between the atoms in the molecule. Draw the expanded structural formula for 1,3-dichlorocyclopentane. Draw the structure by placing atoms on the grid and connecting them with bonds. Include al...

english-dr.faustus
the answer was B

english-dr.faustus
the warning Dr.Faustus teaches is? A-the devil is evil B-do not wish for more than heavenly power permits C-the end will justify the means D-both A and C

math
the product of a 1 digit number and a 2-digit number number is 284 what is the awnser

Pre-Algerbra
In which quadrant does the point lie? Write the coordinates of the point. Point B A. quadrant II; (–2, –4) B. quadrant III; (2, 4) C. quadrant III; (–2, –4) D. quadrant IV; (–4, –2)

Chemistry/Quantitive Anaylsis
Determine the absolute and percent relative uncertainty expressing the result in the correct number of significant digits a.) 6.2 (+-0.2)-4.1(+-0.1) b.)[9.23(+-0.03)][4.21(+-0.20}/21.1(+-0.2) c.)log[3.1415(+-0.001)] d) log[(0.104(+-0.0060)]^1/2 /0.0511(+-0.00090]

Chemistry/Quantitive Anaylsis
Before determining the amount of sodium carbonate in a sample by titration with standard hydrochloric avid the anaylst decide to check the procedure by analyzing a known sample of 98.75 (w/w)% purity. Five replicate determinations of the known gave the following results: 98.71...

Chemistry
The amount of energy released by burning a fuel source, measured in energy per mass, is called the fuel value. If all the energy obtained from burning 1.30 pounds of methane (fuel value is 11.97 kcal/g) is used to heat 122.0 kg of water at an initial temperature of 21.1 °C...

college stats
A study wants to examine the relationship between student anxiety for an exam and the number of hours studied. The data is as follows: Student Anxiety Scores Study Hours 5 1 10 6 5 2 11 8 12 5 4 1 3 4 2 6 6 5 1 2 Why is a correlation the most appropriate statistic? What is the...

Early childhood education
Awesome! Thanks!

Early childhood education
Special educational services for young children with disabilities: a. Cannot be enforced through laws. b. depend on parent efforts. c. do not involve the Head Start Program. d. are rooted in federal legislation. I'm thinking D is the correct answer?

Exceptional Children
Most early childhood professionals children’s agree that the terms inclusion and mainstreaming: A. Both refer to exceptional children’s participation in the general education curriculum. B. Mean the same thing. C. Are two different concepts. D. Both refer to programs...

English
I had to write a paragraph about a personal experience of mine with no passive verbs. When I submitted mine my teacher told me it was almost correct but not right yet. Could you tell me a list of passive verbs?

Computers
What are calculations entered into a spreadsheet called? Formulas? Or Values? I'm thinking its formulas but Values talks about calculations on a spreadsheet too.

geometry
PM is the median of trapezoid KLNO. If ON = 24 centimeters and KL = 12 centimeters, which is the length of PM

literary
I need an example of connotation from the Star Wars series in the form of a quote.

Bio
Assume that a cell culture has a density of 108 cells/mL. You transfer 20 microliters (20 L) of this culture onto a microscope slide. How many cells do you expect will be in this 20 L drop you placed under the microscope?

geometry
Given letters gb and gf how do you write a mathematical to compare their measures?

Statistics
An important measure of the performance of a locomotive is its "adhesion," which is the locomotive's pulling force as a multiple of its weight. The adhesion of one 4400-horsepower diesel locomotive model varies in actual use according to a Normal distribution wi...

Statistics
An important measure of the performance of a locomotive is its "adhesion," which is the locomotive's pulling force as a multiple of its weight. The adhesion of one 4400-horsepower diesel locomotive model varies in actual use according to a Normal distribution wit...

physics
If you walk for 1.66min at a speed of 1.22m/s and then run for 1.66min at 3.05m/s along a straight track, what is the average velocity?

Math- STATS 218
When the following hypotheses are being tested at a level of significance of aH0: m 100 Ha: m < 100 the null hypothesis will be rejected if the test statistic Z is a. >Z b. >Z c. <Z d. <100

critical reading
Elaborate comparisons which are used by advertisers are usually _____. A)fallacies of evidence. B) fallacies of language. C)newsworthy. I think it is B, is this correct?

health
C.

Math
Calculate the percentage strength of hydrocortisone if you combine 30 g of 1%, 45 g of 0.5%, and 15 g of 2%. Round to the hundredth.

Math
Androgel is available in 1% strength. A provider prescribed it for a patient but would like to minimize side effects by starting treatment at a lower 0.3% strength. How much androgel should be added to a base gel to prepare 15 g of the desired strength?

Phamacy School
What is the percentage strength of tretinoin gel when you combine 15 g of 0.025% and 30 g of 0.01%?

MATH
What is the percentage strength of tretinoin gel when you combine 15 g of 0.025% and 30 g of 0.01%?

MATH
Calculate the percentage strength of hydrocortisone if you combine 30 g of 1%, 45 g of 0.5%, and 15 g of 2%. Round to the hundredth.

MATH
Calculate the amount of 8% acetic acid needed to combine with water to make 600 ml of 3.5% acetic acid.

math
What answer did u get

English III
# 3 is B

GEOMETRY
if AB=5X+3 and BC=7x-9 what is the value of AC? using the addition segment postulate

Stats
I posted this question straight from the quiz, so I'm not sure why you're confused.

Stats
Find the number z (± 0.01) such that the proportion of observations that are less than z in a standard Normal distribution is 0.8 Find the number z (± 0.01) such that 59% of all observations from a standard Normal distribution are greater than z

history
Which system of Spanish government did haciendas replace? A. the encomienda B. popular sovereignty C. socialism D. coalitions

algebra 2
find the exact value using the unit circle cos 3.14/6

geometry
PLEASE HELP WITH A FEW QUESTIONS triangle ABC has side lengths 8, 15, and 17 do the side lengths form a pythagorean triple? the length of the hypotenuse of a 30-60-90 triangle is 7 find perimeter to approach the runway, a pilot of a small plane must begin a 10descent starting ...

geometry
I was looking for how to do proportions, i had forgot.

geometry
Thanks for the help on one problem

Chemistry
I need help with the Lewis Dot Structure. I'm so lost. The problems I have and need help with are 1) H2NCH3 2) C3H6 3)NO2-ion 4) H3CSCH2F 5) NCl3 6) H2NCOOH 7)C3H7OH

History
What were the causes of the War of 1812? Where did Republicans and Federalists stand on declaring and then fighting the war? What regional tensions did the war expose?

Chemisty
A 2.5 L volume of sodium hydroxide solution was prepared. The titrant was standarized against primary standard oxalic acid dihydrate, H2C2O4*H2O(molar mass is 126.06) if a 0.4774g sample of the prmiary standard consumed 31.94mL of the base solution in reaching the phenophtalei...

Chemistry
A Student Performing a lab weighed a 1.0993g sample, containing an unknown KHP, which required 18.06mL of 0.1879M NAOH to reach the phenolphtalein endpoint. a) How many moles of base were consumed by the KHP in this sample? b) How many grams of KHP were titrated? c)What is the...

english
According to the Introduction, who encouraged Mary Shelley to expand Frankenstein into a full-length novel

statistics
Whats the difference between creating a z score from a single score and creating one fron a sample mean?

English 4
the choices are: A-the birds were flying over the sea in a straight formation B-the seas were rough C-there was a faint outline of the old man in the crescent of the new moon D-all of the above

algebra
How would I show my work for: 3-2(3)+2(4)+1

Intermediate Algebra (college)
Use the properties of logarithms to condense the expression 1/3[ln(x - 6)- 4 ln y - 2 ln z]

Precalc
if sine theta=.3416 and theta is in quadrant I what is cos theta/2? Using double angle identities.

statistics
I guess 100 is the highest the mean is 30.9 and the standard deviation 2.08 it just says children below the 30th percentile

statistics
Children below the 30th percent are in need of special assistance assistance what raw score makes the cut off score for these children?

Physics
Two parallel wires conduct equal currents in the same direction. (a) At a point in the plane of the wires midway between them, do the individual fields of the wires cancel or reinforce each other? (b) At a point far away from the wires, do their individual fields tend to cance...

AP Chemistry
A voltaic cell is constructed that uses the following half-cell reactions. Cu+(aq) + e- Cu(s) I2(s) + 2 e- 2 I -(aq) The cell is operated at 298 K with [Cu+ ] = 2.3 M and [I - ] = 3.3 M. (a) Determine E for the cell at these concentrations. (b) If [Cu+ ] were equal to 1.0 M, a...

AP Chemistry
A voltaic cell is constructed that uses the following half-cell reactions. Cu+(aq) + e- Cu(s) I2(s) + 2 e- 2 I -(aq) The cell is operated at 298 K with [Cu+ ] = 2.3 M and [I - ] = 3.3 M. (a) Determine E for the cell at these concentrations. (b) If [Cu+ ] were equal to 1.0 M, a...

CHEM
Given the equation 2C8H18 + 25O2 = 16 CO2 + 18H2O: The combustion of octane produces carbon dioxide and water. If you start with 10.0 moles of octane, what mass of water (in grams) would you expect to produce?

Chemistry 1201
thankyou so much! i got 3.65*10^25

Chemistry 1201
A solution of ammonia and water contains 1.00×1025 water molecules and 5.50×1024 ammonia molecules. How many total hydrogen atoms are in this solution?

chemistry
Calculate the enthalpy change for converting 10.0g of ice at -25 degrees Celsius to water at 80 degrees Celsius. The specific heats of ice, water, and steam are 2.09j/g degrees Celsius, 4.18j/g degrees Celsius, and 1.85j/g degrees Celsius. The enthalpy of fusion for water is 6...

chemistry
How do I do a question like this please help and explain it!! Calculate the pH of a buffer solution that contains 0.22 M benzoic acid (C6H5CO2H) and 0.24 M sodium benzoate (C6H5COONa). [Ka = 6.5 × 10-5 for benzoic acid] Round your answer to two places past the decimal.

Chem 111
A solution is prepared by mixing 499 mL of 0.19 M Tris·Base and 592 mL of 0.37 M Tris·Acid. What is the pH of this solution? [Ka(Tris·Acid) = 8.5 × 10-9] Round your answer to two places past the decimal. I can do basic pH questions but I am at a loss...

math
A town has a population of 32,000 in the year 2002; 35,200 in the year 2003; 38,720 in the year 2004; and 42,592 in the year 2005. If this pattern continues, what will the population be in the year 2016?

geography
Which region of southern grasslands in south america have rich deposits of oil and bauxite?

geography
which region of the southern grasslands possesses rich deposits of oil and bauxite?

Chemistry
21 gCH3OH*(1 mol/32.01CH3OH)*(252.8/1 mol)

Chemistry
2CH3OH(g)->2CH4(g)+O2(g) Change in H=252.8 kJ

Chemistry
So far my equation is 21 gCH3OH*(1 mol/32.01CH3OH)

Chemistry
Calculate the amount of heat transferred when 21.0 of CH3OH(g) is decomposed by this reaction at constant pressure.

Chemistry
A gaseous reaction occurs at a constant pressure of 50.0 atm and releases 69.8 kJ of heat. Before the reaction, the volume of the system was 8.80 L . After the reaction, the volume of the system was 2.80 L . Calculate the total internal energy change, change in U , in kilojoules.

Adv. Function math
How would you set up this problem if instead of using 1000 feet of fencing, only 750 feet of fencing is used? Solve the problem to find the maximum area..

Finance
Say that you purchase a house for $270,000 by getting a mortgage for $235,000 and paying a $35,000 down payment. If you get a 15-year mortgage with a 8 percent interest rate, what are the monthly payments?

Physics Please Help!
A solid disk with a mass ok 100 kg and radius of 0.2m turns clockwise through an angular displacement 10 rad when starting from rest attain its maximum angular speed of 1 revolution every 0.5s. How much time did it take for the disk to go from rest to maximum angular speed?

Physics
A solid disk with a mass ok 100 kg and radius of 0.2m turns clockwise through an angular displacement 10 rad when starting from rest attain its maximum angular speed of 1 revolution every 0.5s. How much time did it take for the disk to go from rest to maximum angular speed?

PHYSICS
A solid disk with a mass of 100kg and a radius of 0.2m, turns clockwise through an angular displacement 10 rad when starting from rest to attain its maximum angular speed, of 1 revolution every 0.5s. What is the angular acceleration that the wheel experienced in order to attai...

Physics
A solid disk with a mass of 100kg and a radius of 0.2m, turns clockwise through an angular displacement 10 rad when starting from rest to attain its maximum angular speed, of 1 revolution every 0.5s. What is the angular acceleration that the wheel experienced in order to attai...

algebra
use any three of the digits 2,3,4 and 6 to form an 8 digit factor and a two didgit factor with a estimated product that is between 140 and 250

phi 103
no fallacy committed

Physics
ohh okies thanks for clearing that up (:

Physics
i mean.. mr^2w+Iw = mr^2w+Iw ... which is equivalent to L+L = L+L

Physics
I don't really understand we use I1w1=I2w2? but according to your equation its mr^2+Iw = mr^2+Iw ... which is equivalent to I+L = I+L <-- i dont get this part? and the answer is 0.568 rev/s which according to your way is right but its 19 instead of 29.

Physics
A turntable of radius 2m rotates freely about a fixed vertical axis. A child 19 kg is standing on the turntable right at the outer edge and the system is initially rotating at an angular speed of 0.5 rev/s. The child then moves to position 1m from center of the turntable. what...

algebra
At a local ice cream shop, you can choose from a collection of 18 different toppings. If you want to choose at least one topping, how many different topping combinations are possible (assuming no repeat toppings)?

statistics
Sweden is reported to have among the highest percentage of citizens aged 80 years and over, at approximately 5.5 % (i.e. 5.5 % of it's population falls within this age category). Suppose 20 individuals are randomly selected from the population, and X is the number of indiv...

math
From an exteror point P that is h units form a circle of radius r, a tangent line is drawn to the circle. Let d denote the distance from the point P to the point of tangency T. Express d as a function of h.(HINT: if C is the center of the circle, the PT is perpendicular to CT)

biology
Explain the importance of carbon's ability to form covalent bonds in straight chains, branched chains, or rings.

chemistry
What mass of H2SO4 would be required to react with 0.59 mol of NaOH?

Math
How do I find the relative maximum and minimum and the zeros of f(x)=-x^3+16x^2-76x+96??

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