Friday

April 18, 2014

April 18, 2014

Total # Posts: 1,485

**Chemsitry**

Calculate the molar mass of an unknown molecular compound mixed with solid camphor C10H16O, heated and then cooled giving the following data. show all steps in calculation. mass of unknown: 0.195 g Tf(camphor)= 179.8 degree C Kf(camphor)=-40.0 degree C/m mass of camphor-25.03g...

**Chemistry- Please Help!!**

Calculate the molar mass of an unknown molecular compound mixed with solid camphor C10H16O, heated and then cooled giving the following data. show all steps in calculation. mass of unknown: 0.195 g Tf(camphor)= 179.8 degree C Kf(camphor)=-40.0 degree C/m mass of camphor-25.03g...

**Chemistry- Please Help!**

Calculate the freezing point of an aqueous solution formed by dissolbing 4.22 g of KCl in 25.00 mL of water. Kf for water is (-1.86 degree C/m). Assume density of water is 1.00 g/mL. (Hint: Use the ideal van't Hoff factor, i).

**Chemistry**

Gasoline is primarily a mixture of hydrocarbons and is sold with an octane rating that is based on a comparison with the combustion properties of isooctane. Gasoline usually contains an isomer of isooctane called tetramethylbutane (C8H18), which has an enthalpy of vaporization...

**Chemisty- Please help!**

What mass of a 0.66 molality ammonium nitrate (80.04g/mol) solution will contain 0.15 mol of solute?

**Math for Educators**

24five x 3five ------ 132five 27eight 65eight +43eight ------- 157eight 75eight -37eight ------- 36eight 1213five/3five??? -If someone could please confirm my answers for the others as well as help me with the last division problem thank you! these are all equating in differen...

**Math for Educators **

I am thinking of some #s less than 100. When I divide them by 2 there is a remainder of 1. When I divide them by 3 there is a remainder of 1. When I divide it by 4 there is a remainder of 1. However, when I divide by 5 there is no remainder. what are the #'s? - my answer s...

**Math For Educators **

A homeowner empties her hot water heater every 36 days and changes the filter in the heat pump every 48 days. She did both on Friday September 17th, 2012. When will she do both on the same day? ( give the day of the week, date, month and year. also the date is made up and not ...

**math**

Use an elimination strategy to solve this linear system: 10x + 10y = 1030 5x + 5y = 135

**math**

trixie , we have the same question lol

**math**

so do i write the exact same thing as you wrote? what does this mean? cashews --- x brazils ---- 120-x

**math**

can you help me more please

**math**

15+1/2=0.60(20+x)

**Chemistry**

How many meters underwater is 3.128 atm?

**Math**

Thank you! :)

**Math**

I think it's the second option?

**Math**

A city council candidate asks his campaign staff to gather some polling data. they survey a sample of voters to determine voters' attitudes. Which survey question does not show bias? Don't you think our candidate is the most qualified? Do you think education or propert...

**Chemistry**

What is HO HO C6 H6 CH2 CH NH2?

**CHEM**

If a 5.0L volume of O2 (g) is at 1.0 atm, if we hold the temperature and molar amount of O2 constant how many psi of pressure does this amount of O2 exert if the volume it is allowed to take up is decreased to 2.0L?

**Chem 104**

If a 5.0L volume of O2 (g) is at 1.0 atm, if we hold the temperature and molar amount of O2 constant how many psi of pressure does this amount of O2 exert if the volume it is allowed to take up is decreased to 2.0L?

**math**

The deepest part of the Pacific Ocean is Marianas Trenchwith a depth of 10,911 meters,The deepest part od the Alantic Ocean is the Puerto Rico Trench with a depth of 8,648 meters Whatn is the difference in elevation of the two trenches?

**economics**

1) Recent trends toward trade restrictions have been to a) lower only those trade barriers related to technology. b)shield a country's automobile industries. c)increase trade barriers. d) decrease trade barriers

**Math**

In Example 2, find the percent of the total and the number of degrees in each sector for mountains, theme parks, relatives, and other. Find the median of the data set in Example 3. In which category does it fall? Find the average unemployment rate for Example 4. Determine whic...

**Algebra**

I need help with two math problems. 1. A triangle has vertices (1, 4), (1, 1), and (-3, 1). The triangle is dilated by a scale factor of 2, then translated 5 units up, and then rotated 90 degrees counterclockwise about the origin. What are the vertices of the image of the tria...

**Math**

12x2/3=8 cookies

**Chemistry**

unbalanced: PbO+NaCl+H2O+CO2 yields Pb2Cl2CO3+NaOH

**Chemistry**

How many grams of phosgenite can be obtained from 10.0 g of PbO and 10.0 g of NaCl in the presence of excess water and carbon dioxide

**Chemistry**

a .6800g sample of carboxylic acid is burned in oxygen, producing 1.212 g of CO2 and .4991 g of H2O. determine the empirical formula of the carboxylic acid

**Chemistry**

the reaction of 6.62g of carbon with excess oxygen yields 13.40g of CO2. what is the percent yield of this reaction

**English**

Do you think you could help me with 3 more?

**English**

Is it the first option?

**English**

For the first one I think it is the second option. And for the second, I think it is the third option. What you think? :D

**English**

Choose the correct form for each phrase. 1. the budget for this month this months budget this month's budget this months' budget this months's budget 2. the schedule of the doctor the doctor's schedule the doctors schedule the doctors' schedule the doctors&...

**Psychology**

Personality disorders are thought to originate during childhood but many health professionals are reluctant to diagnose children. Why is this? I need to know the positives and negatives of early diagnosis of personality disorders in children. Can someone please help me out? Th...

**Physics--please help!!**

A student in a parked car honks the horn, which has a `proper' frequency of 320 Hz. An observer in an approaching vehicle measures the frequency of the sound to be 355 Hz. Calculate the speed of the approaching vehicle. Use 340 m/s as the speed of sound in air.

**Physics--please help!!**

A hydrogen atom, when vigorously perturbed, can emit light with a frequency of 6.16·1014 Hz. When the same light from hydrogen atoms in a distant galaxy is observed on earth, the frequency is 5.76·1014 Hz. Calculate the speed at which the galaxy is receding from ...

**math**

A soccer player kicks a ball and gives it an initial upward velocity of 47 feet per second. If everyone waits for the ball to bounce, how long will it be in the air? (Use the vertical motion formula, h= -16tsquared + vt + c, where h is the height of the ball will be at time t,...

**Trig(I think)**

Suppose oil spills from a ruptured tanker and spreads in a circular pattern. If the radius of the oil spill increases at a constant rate of 1m/s, how fast is the area of the spill increasing when the radius is 30m?

**Science**

The density of ethanol is 0.789 g/cm3 at 20 degrees celsius. What is the mass of 150cm3 of this alcohol?

**physics for physical science**

2.232667747500

**algerba 1**

Solve by graphing 1. 2x2-7x+5=0 2. 2x2+x-6=0

**Algebra 2**

Thank you sooooooo much

**Algebra 2**

a) The average height of sunflowers in a field is 64 inches with a standard deviation of 3.5 inches. Describe a normal curve for the distribution, including the values on the horizontal axis at one, two, and three standard deviations from the mean. b) If there are 3,000 plants...

**Algebra 2**

thank you

**algerba 1**

1. the sum of 3 numbers is 207. the 2nd # is 8 times the first, while the third is 3 less than the first. find the #s. 2. the sumof 3 numbers is 161. the second number is 6 times the first, and the third is 5 more than the second. find the #s. Thanks so much!

**chemistry**

How many grams of NaCl must be added to 225.0 g of H2O at 45 °C to lower the vapor pressure of water by 2.21 mmHg? The vapor pressure of pure water is 71.93 mmHg at 45 °C.

**Life Orientation**

describe the lifestyle behaviour of the youth who abuse illegal and legal drugs and discuss how this lifestyle behaviour impacts the teenager.

**Life Orientation**

describe the lifestyle behaviour of the youth who abuse illegal and legal drugs and discuss how this lifestyle behaviour impacts the teenager.

**health**

The ________ muscle mass belongs to the posterior group

**Help math!!**

15 students took a science test. the average score was 88.0. later in the day a sixteenth student took the same test and scored a 92. the teacher recalculated the class average using all 16 of the scares. by how much will the class average have increased? show your work.

**chemistry**

assume all of the ionized aspirin remains in the buffer solution and all of the un-ionized aspirin goes into to the ethyl acetate, what is the molarity of the aspirin in the ethyl acetate at pH 2 and pH 8? what equation would ou use for this?

**Math**

if kelly gave 1/3 of a pizza to holly and 1/5 to diane how much did she have left

**calculus**

Find an equation of the tangent line to the curve at the given point. y^2=x^3 (2-x) (1,1)

**Physics**

A man seeking to set a world record wants to tow a 122000-kg airplane along a runway by pulling horizontally on a cable attached to the airplane. The mass of the man is 95 kg, and the coefficient of static friction between his shoes and the runway is 0.74. What is the greatest...

**Physics**

A rescue helicopter is lifting a man (weight = 797 N) from a capsized boat by means of a cable and harness. (a) What is the tension in the cable when the man is given an initial upward acceleration of 0.711 m/s2? (b) What is the tension during the remainder of the rescue when ...

**Physics**

A stuntman is being pulled along a rough road at a constant velocity by a cable attached to a moving truck. The cable is parallel to the ground. The mass of the stuntman is 110 kg, and the coefficient of kinetic friction between the road and him is 0.825. Find the tension in t...

**Chemistry**

I figured it out. Nevermind.

**Chemistry**

For the reaction: 2HCl + Na2CO3→ 2NaCl + H2O + CO2 how much CO2 is produced at STP if 18.5 L of 1.15 M Na2CO3is used? The molar mass of Na2CO3is 106.01 g/mol. I know I have to use stoichiometry and possibly PV=nRT but I don't know what to use first. Do I start with 1...

**ethical/unethical**

unethical because one's body is used for experimentation oppose to being used for medical reason- does not value the person as in human being that once lived

**ethical/unethical **

Is it ethical/unethical to use human cadavers to test out weapons and used them as crash test dummies?

**stats**

yes I used it against the alpha level .05 of the z score +/- 1.96 so I reject because it is less than stating that those who consumed salty foods didn't have an significant impact on whether the intake of salt affects weight

**stats**

So I have the mean as 162.5 and standard deviation 18.86 standard error =s/square root n =18.86/12= 5.44 t=m-mean/standard error = 150-162.5/5.44= -2.29 So we fail to reject Ho

**stats**

So I will have to find the mean and standard deviation of the sample. Then how will I set up the hypothesis to begin running the test

**stats**

Here's the rest of the data 155 160 150 145 200 155 190 140 170 175 142 168

**stats**

Which test should be used one samples t test, independent samples t test or dependent samples t test You may have heard that eating salt can influence people’s weight. Assume that the normal weight of 20-year-old females is 150 pounds. You obtain a sample of 20-year-old ...

**stats**

Which test should be used one samples t test, independent samples t test or dependent samples t test You may have heard that eating salt can influence people’s weight. Assume that the normal weight of 20-year-old females is 150 pounds. You obtain a sample of 20-year-old ...

**science**

for scientific research

**science**

is the use of cadavers a positive thing for society

**math**

A motorcycle leaves colorado springs, colorado, traveling north on I25 at an average speed of 47 mph. one hour later, a car leaves colorado springs, traveling south on I-25 at an average speed of 54 mph. How long after the motorcycle leaves will it take until they are 52 miles...

**stats**

so I will found my mean for this set by adding up all the data points and divide by 5

**stats**

which test to use One-sample or independent samples t-test? A researcher tests five individuals who have seen paid political ads about a particular issue. These individuals take a multiple-choice test about the issue in which people in general (who know nothing about the issue...

**Accounts**

You notice that your accounts receivable days outstanding has doubled in the first 6 months. Do you give someone a bonus or put him or her on probation? Why?

**calculs**

If f(3) =4 g(3)=2 f'(3)=6 and g'(3)=5 find the following numbers a) (fg)' (3) b) (f/g)' (3)

**Physical Science**

Find the change in the force of gravity between two planets when their masses remain the same but the distance between them is increased by 10 times.

**chemistry**

I need to find the radius of a cylinder with only the following info: Cylinder height=125um There is 1 C atom/0.01848 nm^2 There are 5.75x10^10 C atoms on the surface of cylinder Use quadratic formula to solve

**language arts**

I want a compostion on the moon

**math**

In Chicago, the tax on a property assessed at $550,000 is $7,700. If tax rates are proportional in this city, how much would the tax be on a property assessed at $920,000? write a proportion to solve the question.

**math**

If Kimberly walks 5 miles in 40 minutes, then Kimberly will walk how far in 110 minutes?

**math**

To be eligible for a car loan, Melissa's monthly rent and utilities cannot exceed 30% of her take-home pay. Use the information below to determine whether Melissa is eligible for the loan. Gross paycheck-$3950 Net paycheck (after taxes)-$3260 Rent-$925 Utilities-$150

**math**

After dinner, Amanda, Trey and John received the check for their meal. Trey is paying 1/4 of the check and leaving no tip. Amanda is paying the remainder of the check. John is leaving 20% of the check as a tip. Using C as the amount of the check, match each person with an app...

**math**

The United States Department of Agriculture reports that 15% Americans are now on food stamps. If there are about 300 million Americans, how many millions of people are on food stamps?

**math**

Vicki is contemplating consolidating her federal student loans with Loan Consolidation Experts Inc. She currently pays five separate federal loans totaling $30,000 in principal at 4.5% simple interest for 20 years. Loan Consolidation Experts Inc. is offering to consolidate he...

**math**

Sonja needs to borrow $2,251 to pay for her college classes. Sallie Mae is offering her a 4.5% simple interest loan with an interest charge of $405.18 over the life of the loan. How many years is Sallie Mae giving her to pay back the loan with interest?

**math**

According to a USA Today Gallup poll, there is a racial divide on views of the Trayvon Martin/George Zimmerman case in Sanford, FL. The poll showed that 73% of blacks polled believe George Zimmerman would have been arrested if Trayvon Martin was white, while 771 of 2,334 white...

**math**

Isaiah and Chakshu went to dinner at Chili's restaurant and received a bill for $35. Isaiah paid the bill along with an additional 20% tip on his charge card. What was the total amount that he put on his charge card?

**math**

In March of 2012, GM reported a 12% increase in number of vehicles sold compared to March of 2011. If the total number of vehicles sold by GM in March of 2012 was 231,000, how many vehicles were sold in March of 2011?

**math**

Vicki is contemplating consolidating her federal student loans with Loan Consolidation Experts Inc. She currently pays five separate federal loans totaling $30,000 in principal at 4.5% simple interest for 20 years. Loan Consolidation Experts Inc. is offering to consolidate her...

**math**

The American flag has a width of 15 feet and a length of 5 feet less than twice the width. Determine the amount of square feet of fabric required to make an American flag?

**math**

The Bermuda Triangle, known for its disappearance of ships since 1950, has a base between Miami and Puerto Rico, which is about 1000 miles. Its height is between the Bahamas and Bermuda, which is also about 1000 miles. Find the area covered by the Bermuda Triangle.

**math**

Carpet sells for $2 per square foot. It will cost you $360 to recarpet your room. If your room is 20 feet long, how many feet wide is it?

**math**

he dimensions of Liz's desk are 3.2 feet wide and 4.6 feet long. Match the description on the left with the appropriate calculation. Length Width Perimeter Area No match CHOICES: A) 15.6 feet B) 4.6 feet C.) 14.72 sq. feet D). 15.6 sq. feet E). 3.2 feet

**math**

In order for you to put down new sod in the front yard you will need 5400 pieces of sod. Each sod piece is cut into one foot squares. If your yard is 60ft wide , how long is the yard.?

**math**

My new TV has a perimeter of 164 inches. Its width is 8 inches less than twice the height. How many inches wide is the TV?

**math**

A gardener wants to use 62 feet of fencing to enclose a rectangular shaped garden. If its length is 4 feet longer than twice its width, find the width of the garden

**math**

Myra's bulletin board has a width of 60 inches. When she originally decorated it she needed 192 inches of border material. How many inches high is the bulletin board?

**math**

A football field is 120 yards long and 53 yards wide. How much fencing is needed to enclose the field?

**Calculus**

F(x) = 2√(1 + tanx) f'(x) 2√ = x^(1/2)

**math**

-5x^2+5y^3 x=-5, y=-3

**math**

1/4y-8=1/7y solve for y.

**math**

1/3y-9=1/10y solve for y.

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