Tuesday

January 17, 2017
Total # Posts: 1,715

**Chemistry II**

You place 1.234 g of solid Ca(OH)2 in 1.00 L of pure water at 25°C and it partially dissolves. The pH of the solution is 12.40. Estimate the Ksp for Ca(OH)2.

*March 27, 2012*

**Chemistry**

A 20.2 mL sample of a weak monoprotic acid, HX, requires 50.0 mL of 0.060 M NaOH to reach the equivalence point. After the addition of 30.0 mL of NaOH, the pH is 5.50. What is the Ka of HX?

*March 27, 2012*

**arithmetic**

The pet shop owner told jean to fill the new fish tank 3/4 full of water.Jean filled the tank 9/12 full.What fraction of the tank does she still need to fill?

*March 21, 2012*

**statistics**

A student is interested in whether students who study with music playing devote as much attention to their studies as do students who study under quiet conditions (he believes that studying under quiet conditions leads to better attention). he randomly assigns participants to ...

*March 18, 2012*

**CHEMISTRY HELP NEEDED!!**

Given info: Reaction: 3A+2B--->2C+D {A] (mol/L) 1.0 ×10^-2 1.0 ×10^−2 2.0 ×10^−2 2.0 ×10^−2 3.0 ×10^−2 [B] (mol/L) 1.0 3.0 3.0 1.0 3.0 Rate of appearance of C (mol/L-hr) 0.30×10^−6 8.10×10^−6 3....

*March 11, 2012*

**Chemistry**

Given info: A] (mol/L) [B] (mol/L) Rate of appearance of C (mol/L-hr) 1.0 ×10^-2 1.0 0.30×10^−6 1.0 ×10^−2 3.0 8.10×10^−6 2.0 ×10^−2 3.0 3.24×10^−5 2.0 ×10^−2 1.0 1.20×10^−6 3.0 ×10...

*March 11, 2012*

**Chemistry**

calculate the specific rate constant between substances A and B has been found to given data 3A + 2B ---> 2C + D

*March 11, 2012*

**Chemistry**

calculate the specific rate constant A] (mol/L) [B] (mol/L) Rate of appearance of C (mol/L-hr) 1.0 ×10^-2 1.0 0.30×10^−6 1.0 ×10^−2 3.0 8.10×10^−6 2.0 ×10^−2 3.0 3.24×10^−5 2.0 ×10^−2 1.0 1.20×...

*March 11, 2012*

**Chemistry**

calculate the specific rate constant A] (mol/L) [B] (mol/L) Rate of appearance of C (mol/L-hr) 1.0 ×10^-2 1.0 0.30×10^−6 1.0 ×10^−2 3.0 8.10×10^−6 2.0 ×10^−2 3.0 3.24×10^−5 2.0 ×10^−2 1.0 1.20×...

*March 11, 2012*

**Chemistry**

collect the specific rate constant....

*March 11, 2012*

**Chemistry**

calculate the specific rate constant A] (mol/L) [B] (mol/L) Rate of appearance of C (mol/L-hr) 1.0 ×10^-2 1.0 0.30×10^−6 1.0 ×10^−2 3.0 8.10×10^−6 2.0 ×10^−2 3.0 3.24×10^−5 2.0 ×10^−2 1.0 1.20×...

*March 11, 2012*

**Chemistry**

calculate the specific rate constant A] (mol/L) [B] (mol/L) Rate of appearance of C (mol/L-hr) 1.0 ×10^-2 1.0 0.30×10^−6 1.0 ×10^−2 3.0 8.10×10^−6 2.0 ×10^−2 3.0 3.24×10^−5 2.0 ×10^−2 1.0 1.20×...

*March 11, 2012*

**Chemistry**

How would you analyze a solution known to contain Hg22+ and Cu2+?

*March 11, 2012*

**PHYSICS**

Determine the value for the acceleration due to gravity at the surface of the planet Mars, given the following data: Mass of Mars = 6 .42 x 10^23 kg Radius of Mars = 3.37 x 10^6 m Thanks!

*March 10, 2012*

**CHEMISTRY**

Ppcl3 6.78 torr Pcl2 26.4 Ppcl5 224

*March 9, 2012*

**Math**

x^2+1/4x+_?__

*March 8, 2012*

**physics**

115.19

*March 7, 2012*

**Physics**

Take the radius of the earth's orbit to be 1.5 x 1011 m. a. Using a year to be 365 days, find the speed of the earth as it moves around the sun. __m/s b. Convert this speed to miles/hour (show your conversion factor in your written backup). __miles/hour

*March 5, 2012*

**Physics**

Take the radius of the earth at the equator to be 6380 km a. Find the speed the speed of an object at the equator due to the earth's rotation. ___m/s b. Convert this speed to miles/hour (show your conversion factor in your written backup). __miles/hour

*March 5, 2012*

**Stats**

Explain how to calculate margin of error. What effect does increasing your sample size have on the margin of error? What effect does it have on the confidence level? What effect does it have on the confidence interval?

*March 1, 2012*

**algebra**

a bag contains only nickels and dimes. there are exactly 18 coins in the bag. the amount of money in the bag is $1.25. let x represent the number of nickels in the bag. let y represent the number of dimes in the bag. 1. write a system of equations that correctly models this ...

*March 1, 2012*

**algebra**

you are planning a cookout. you figure that you will need at least 5 packages of hot dogs and hamburgers in total. a package of hot hods costs $1.90 and a package of hamburgers costs $5.20. you can spend a maximum of $20 in total on the hot dogs and hamburgers. Identify two ...

*March 1, 2012*

**algebra**

find each probability if you pick a card, do not replace it, then pick a second 3 white cards 5 black cards and you pick black, then white

*March 1, 2012*

**Stats**

Explain how to calculate margin of error. What effect does increasing your sample size have on the margin of error? What effect does it have on the confidence level? What effect does it have on the confidence interval?

*February 27, 2012*

**Stats**

Explain how to calculate margin of error. What effect does increasing your sample size have on the margin of error? What effect does it have on the confidence level? What effect does it have on the confidence interval?

*February 26, 2012*

**Math**

1.5x+4y=8 x+y=7 Please help me solve this system of equation and show your work.

*February 25, 2012*

**chemistry**

How many liters of 0.101 m NaCl contains 1.70 mol of this salt? Assume this solvent is H2O. Answer in units of L I do not understand what i am looking for or how to solve for it. Steps would be appreciated.

*February 22, 2012*

**algebra**

A DVD player's laser reader helps to "read" the information on the DVD. A particular laser reader measures 0.56 micron thick. does this fall with the required standards if a company uses |t - 0.03 | <= 0.525 for determining the part to be acceptable?

*February 22, 2012*

**algebra**

A typical DVD can store between 137.9 and 142.1 minutes of data before it is considered full. write an absolute value inequality describing the minutes of data (w) a full DVD will hold.

*February 22, 2012*

**algebra**

A bump on a DVD needs to be between 0.45 and 0.55 micron wide and 0.95 and 0.99 micron high. write two absolute value inequalities describing the width (x) and height (y) of the bump.

*February 22, 2012*

**biology**

suggest a reason for the failure of some of the molecules to diffuse through the semipermeable membrane.

*February 17, 2012*

**Chemistry**

.28C = 30C * x/.2kg x = .001867 moles S .001867 moles S = .48g S/x x = 8.0177 molecular formula for S Is this correct?

*February 17, 2012*

**Chemistry**

If 0.48 g of sulfur are added to 200 g of carbon tetracholoride, and the freezing point of the carbon tetrachloride (Kf=30 degrees C/m) is depressed by 0.28 degrees C, what is the molar mass and molecular formula of the sulfur? .48g * 1mol/32.07g= .01497 mol S .01497/.2 kg = ....

*February 17, 2012*

**Chemistry**

.48g * 1mol/32.07g= .01497 mol S .01497/.2 kg = .07485 molality 273.28K= i * 293K * .07485 i = .08 ??

*February 17, 2012*

**Chemistry**

thank you :)

*February 17, 2012*

**Chemistry**

If 0.48 g of sulfur are added to 200 g of carbon tetracholoride, and the freezing point of the carbon tetrachloride (Kf=30 degrees C/m) is depressed by 0.28 degrees C, what is the molar mass and molecular formula of the sulfur?

*February 17, 2012*

**math**

Assume that you randomly select 8 cards from a deck of 52. What is the probability that all of the cards selected are hearts?

*February 15, 2012*

**Math**

A group of students who are selecting 2 of their group at random to give a report, but assume that there are 5 males and 3 females. What is the probability that 2 females are selected? 2 males?

*February 15, 2012*

**Math**

Assume that you select 2 coins at random from 5 coins: 3 dimes and 2 quarters. What is the probability that all of the coins selected are dimes?

*February 15, 2012*

**sociology**

Social capital refers to the collective value of all "social networks" [who people know] and the inclinations that arise from these networks to do things for each other ["norms of reciprocity"].

*February 14, 2012*

**sociology**

cultural capital is defined as “forms of knowledge, both tangible and intangible, that have value in a given society in relation to status and power Cultural capital defines how people (human) engage each other (social) and their resources (economic).

*February 14, 2012*

**sociology**

what are some examples of social and cultural capital that young children experience

*February 14, 2012*

**Physics**

A 1.7 cm thick bar of soap is floating in water, with 1.1 cm of the bar underwater. Bath oil with a density of 890.0 kg/m3 is added and floats on top of the water. How high on the side of the bar will the oil reach when the soap is floating in only the oil.

*February 9, 2012*

**Physics**

A 1.7 cm thick bar of soap is floating in water, with 1.1 cm of the bar underwater. Bath oil with a density of 890.0 kg/m3 is added and floats on top of the water. How high on the side of the bar will the oil reach when the soap is floating in only the oil.

*February 9, 2012*

**math**

45 1/5 x 3/4 =

*February 6, 2012*

**biology**

the importance of these organic compounds ( carbohydrates, proteinds, lipids) in the cells and tissues of living things

*February 6, 2012*

**Physics**

A ball is thrown upward from the top of a 50.0 m tall building. The ball's initial speed is 12.0 m/s. At the same instant, a person is running on the ground at a distance of 44.0 m from the building. What must be the average speed of the person if he is to catch the ball ...

*February 5, 2012*

**English**

yes i read it but i dnt understand it

*January 31, 2012*

**launguge arts**

I need to un scramble these words and make new ones help eioubdhrs

*January 27, 2012*

**bio101**

2. Find a media piece—article, video, presentation, song, or other—that recognizes the fundamental concepts of chemistry in biology. Include the link or reference citation for the piece and describe how it helped you better understand how fundamental concepts of ...

*January 26, 2012*

**math**

Joe and Bob manufacture bikes. Joe can make 12 bikes in 8 hours while Bob can make 12 bikes in 6 hours. Working together how many hours will it take them to make 12 bikes? Please explain showing steps so I can learn it. I don't just need the answer. Thanks! PS I originally...

*January 26, 2012*

**math**

Joe and Bob manufacture bikes. Joe can make 12 bikes in 8 hours while Bob can make 6 bikes in 12 hours. Working together how many hours will it take them to make 12 bikes? Please explain showing steps so I can learn it. I don't just need the answer. Thanks!

*January 26, 2012*

**physics**

A soccer player kicks the ball toward a goal that is 27.8 m in front of him. The ball leaves his foot at a speed of 18.5 m/s and an angle of 30.4° above the ground. Find the speed of the ball when the goalie catches it in front of the net. (Note: The answer is not 18.5 m/s...

*January 26, 2012*

**algebra**

here's the rest of the info there is angle on one triangle measured 15.5 ft and on another triangle 5ft2 inn and 7ft 9 in

*January 25, 2012*

**algebra**

Jenny is 5ft 2in. tall. To find the height of a light pole, she measured her shadow and the pole shadow What is the height of the pole?

*January 25, 2012*

**biology**

Hydrochloric acid

*January 24, 2012*

**algebra**

determine whether 17 is a solution of the equation 5x+7 = 92

*January 24, 2012*

**chemistry**

Can somone please explain how to do this problem: How many cubic centimeters of olive oil have the same mass as 1.00L of gasoline? the density of gas is .66g/ml and olive oil is .92g/ml Thank you for your help

*January 24, 2012*

**chemistry**

Sorry, it's an 8.0 oz box so there are 16 servings in the box Thanks

*January 24, 2012*

**chemistry**

how many grams of sodium are used to prepare 50 boxes of crackers? sodium per serving is 140mg, serving size is .50 oz for 6 crakers. i got 112g and the answer is suppose to be 110g and i cant figure out how to get 110 thank you

*January 24, 2012*

**chemistry**

why are the atoms in metallic bonds positively charged?

*January 23, 2012*

**physics**

1. Calculate the radius of orbit for a hydrogen electron in the n=3 level. 2.The half life of an unknown substance is one minutes. If the initial number of particles is 20 how many particles will remain after two minutes have elapsed?

*January 23, 2012*

**myths**

what are some modern day myths?

*January 22, 2012*

**Math, Quadratics**

Farmer John is building a pen to keep his pig in. John has 40m of fencing. He will only need to make 3 sides to the pen because the 4th side will be along a barn. If John wants the maximum area what should the side lengths of the pen be?

*January 21, 2012*

**Math, Quadratics**

Hi Damon, I got the same answer as you up to the equation x^2 + 30x - 200=0, but after that I don't understand what happened after that.. where does the 900 and 800 come form? and why you do divide by 2? thanks

*January 21, 2012*

**Math, Quadratics**

Adam has a hockey rink in his backyard. The current dimensions are 10m by 20m. Adam wants to have a hockey tournament and needs to double the area of his hockey rink. How much must Adam increase each dimension if he wants to increase them the same amount?

*January 21, 2012*

**physics**

A rocket is fired at a speed of 75.0 m/s from ground level, at an angle of 59.7° above the horizontal. The rocket is fired toward an 11.0 m high wall, which is located 28.5 m away. The rocket attains its launch speed in a negligibly short period of time, after which its ...

*January 18, 2012*

**Chemistry**

What mass of sodium bromide (NaBr) is required to make 250 cm3 of a 0.35 mol.dm-3 solution?

*January 12, 2012*

**Chemistry**

320g of sulfur dioxide react with 32.0g of oxygen and excess water to form sulfuric acid (H2SO4) a. What is the limiting reagent? b. What is the theoretical yield of product? c. How many grams of excess reagent will remain?

*January 11, 2012*

**Chemistry**

Ethane (C2H6) reacts with oxygen to produce carbon dioxide and water. Assuming there is an excess of oxygen, calculate the mass of CO2 and H2O produced from 1.25 g of ethane

*January 11, 2012*

**7th grade Math**

Sorry Eric, yes I did mean 43 (typo sorry)

*January 11, 2012*

**7th grade Math**

Assume that there are 100 marbles in each bag. Firstly divide 100 by 7 (ratio 4:3) 14.28. Multiply 14.28 by 4 = 57.12 *57 marbles Mulitply 14.28 by 3 = 42.84 *53 marbles Secondly do the same for ratio 3:2 Divide 100 by 5 = 20 Multiply 20 by 3 = 60 marbles Multiply 20 by 2 = 40...

*January 11, 2012*

**fifth grade math**

Daughter has homework problem. P(3,6) is only thing listed. ?

*January 5, 2012*

**math**

Correction...it is supposed to be P(6,3)

*January 5, 2012*

**math**

We don't understand

*January 5, 2012*

**math**

P(3,6)

*January 5, 2012*

**statistics**

Scores on a certain nationwide college entrance examination follow a normal distribution with a mean of 400 and a standard deviation of 100. Find the probability that a student will score over 500.

*December 18, 2011*

**algebra**

which measure will remain the same if Jarod next three quiz score are 96,93,and 93 a.mode b.range c.mean d.median

*December 15, 2011*

**geometry**

Its a if, then question. It says If I get another chance, then I will do better. And 'i get another chance is lined' what would it be? Like would it still be a hypothesis without the 'if' underlined? Would it be the argument?

*December 12, 2011*

**physics**

A roof rises 1.7 feet vertically and 13.3 feet horizontally. What is the grade of the roof in percentage

*December 12, 2011*

**Spanish**

NO its (Ella es americana.)

*December 10, 2011*

**algebra**

what is the sq root property of 2x^2=26

*December 8, 2011*

**Physics**

In 35.0 s, a pump delivers 0.574 m3 of oil into barrels on a platform 25.5 m above the intake pipe. The oil's density is 0.820 g/cm3.

*December 7, 2011*

**math word problem**

A rectangle garden is 30 ft by 40 ft. Part of the garden is removed in order to install a walkway of uniform width around it. The area of the new garden is one-half the area of the old garden. How wide is the walkway?

*December 5, 2011*

**math**

The number 33 bus arrives at the corner of Coldspring and Hillen every 15 minutes. The number 40 bus arrives at the same corner every 46 minutes. If both buses leave the corner at 9:08 am, when is the next time the buses arrive at the corner at the same time?

*December 1, 2011*

**Algebra**

Thank you.

*November 29, 2011*

**Algebra**

Divide: (20b^(3)+17b^(2)+18b+43)÷(4b+5)

*November 29, 2011*

**Algebra**

Thank you.

*November 29, 2011*

**Algebra**

3y-24/14 divided by y-8/4y

*November 29, 2011*

**Algebra**

Thank you.

*November 29, 2011*

**Algebra**

Solve for x. 4x(x-1)-5x(x)=3

*November 29, 2011*

**english**

What is the word ball in this sentence? The young boy played ball in the yard. adverb?

*November 28, 2011*

**PARAPHRASING CONFUSION PLEASE HELP???**

I need help with this and have no clue as to what I should do. I have trouble with paraphrasing. Review the following passage and paraphrase the long passage in the following box. Use the reference to create an appropriate APA-formatted, in-text citation. Additionally, include...

*November 27, 2011*

**Algebra**

Thank you very much!!

*November 22, 2011*

**Algebra**

-4^2+44x-160=0 If you graphed the above equation, would the graph open up or down? How can you tell without graphing it?

*November 22, 2011*

**Algebra**

A farmer decides to enclose a rectangular garden, using the side of a barn as one side of the rectangle. What is the maximum area that the farmer can enclose with 100 ft of fence? What should the dimensions of the garden be to this given area? The maximum area that can be ...

*November 21, 2011*

**Algebra**

The length of a rectangle is twice the width. The area is 578 yd.^2. Find the length and width.

*November 21, 2011*

**Algebra**

Thank you.

*November 21, 2011*

**Algebra**

In the community you live, you have been asked to serve on the planning committee for the Fourth of July festival. Your committee has decided to begin meeting early to avoid some of the problems experienced in previous years. Unfortunately, those problems stemmed from poor ...

*November 21, 2011*

**finance**

You have just graduated and one of your favorite courses was Financial Management. While you were in school, your grandfather died and left you $1 million. You have decided to invest the funds in a fast-food franchise and have two choices–Franchise L and Franchise S. You ...

*November 15, 2011*