Tuesday

March 3, 2015

March 3, 2015

Total # Posts: 2,310

**Chemistry**

never mind i understand where you were getting at thanks
*November 30, 2012*

**Chemistry**

do i have to account for the NaF, when plugging in the concentration for F^-. The reason im confused is because they are both weak in respect to their acidity and base that wont allow them to dissociate and i dont really know where to go from there
*November 30, 2012*

**Chemistry**

consider 1.0 L of a solution which is 0.55 M HF and 0.2 M NaF (Ka for HF = 7.2 x 10-4), Calculate the pH of this solution
*November 30, 2012*

**Statistics**

I need to know how to find the probability that z0 is greater than or equal to 2.40 using my TI-83+. The answer is .008200, but I don't know how to get that using my calculator. The only reason I know the answer is because it is an example from my homework. Please help!
*November 29, 2012*

**Math**

How can I get 24 out of 2.4, 7.5, 1, and 6 using +, -, *, and/or /
*November 28, 2012*

**programming**

Using Raptor, create a condition loop that will ask the user for input of two numbers. The numbers should be added and the sum displayed. The loop should also ask the user if he or she wishes to enter two more numbers and perform the operation again, the response to the ...
*November 28, 2012*

**chemistry**

Naphthalene, commonly known as moth balls, is composed of 93.7% carbon and 6.3% hydrogen. determine the empirical for naphthalene. molecular formula for Naphthalene. Determine the number of empirical formulas you would need to make a full naphthalene molecule.
*November 28, 2012*

**chemistry**

Vanadium oxide is used as an industrial catalyst. The percent composition of this oxide is 56.0% vanadium and 44.0% oxygen. Determine the empirical formula for vanadium.
*November 28, 2012*

**programming**

Develop psuedocode to control operation of vending machine The ACME Company has approached you with a request to develop the psuedocode that will control the operations of their new series of vending machines. The program will be required to maintain the product inventory and ...
*November 26, 2012*

**chemisrty**

how many liters of oxygen can be produced at stp from the decomp. of .25 liters of 3M H2O2 ACCORDING TO THE REACTION 2H2O-2 H2O+O2
*November 24, 2012*

**algebra**

(3a^4b+4ab^3)+(5ab^3-3a^4b
*November 21, 2012*

**Math - 8th grade - Please help**

I don't know the formula to figure this out. Charlie and Peter are driving around a racetrack. Charlie drives at an average speed of 108 miles per hour. Peter drives at an average speed of 99 miles per hour. Peter is given a head start of 12 miles. Charlie and Peter finish...
*November 16, 2012*

**8th Grade math - Ms. Sue please**

An archaeologist has set up a dig at a newly discovered site. She and her team start excavating an area that is 36 feet by 24 feet. Because the scientists find many artifacts near the edges of this area, they decide to expand the dig. They add nine feet in all directions to ...
*November 16, 2012*

**8th grade math - Ms. Sue please**

Charlie and Peter are driving around a racetrack. Charlie drives at an average speed of 108 miles per hour. Peter drives at an average speed of 99 miles per hour. Peter is given a head start of 12 miles. Charlie and Peter finish at the same time. How far does Charlie drive? ...
*November 16, 2012*

**math**

Ms Sue, can you help please?
*November 16, 2012*

**math**

Charlie and Peter are driving around a racetrack. Charlie drives at an average speed of 108 miles per hour. Peter drives at an average speed of 99 miles per hour. Peter is given a head start of 12 miles. Charlie and Peter finish at the same time. How far does Charlie drive? ...
*November 16, 2012*

**Math**

The area of a circus ring is about 1,385 square feet. What is the circumference of the ring?
*November 16, 2012*

**Math**

Franco is ordering lunch with a drink, sandwich, and a salad. He has a choice of 3 drinks, 2 sandwiches, and 4 salads. How many possible lunches are there? 3*2*4=24 lunches?
*November 16, 2012*

**Physics**

A baseball player throws a baseball up at 24.3 m/s. How long must he wait before he can catch the baseball on its way down?
*November 15, 2012*

**Math**

Explain how you can determine whether a system of two linear equations will be consisten, dependent, or inconsistent?
*November 15, 2012*

**chemistry**

CH3CH2CH=CHCH3 --KMnO4-> Include all steps of reaction, any additional reagents/conditions needed and the products formed. ive been stuck on this for hours need help please
*November 13, 2012*

**chemistry**

CH3CH2CHCHCH3 --HIO4-> | | HO OH Include all steps of reaction, any additional reagents/conditions needed and the products formed. ive been stuck on this for hours need help please
*November 13, 2012*

**chemistry**

CH3CH2CH=CHCH3 --KMnO4-> Include all steps of reaction, any additional reagents/conditions needed and the products formed. ive been stuck on this for hours need help please
*November 13, 2012*

**Chem**

Is this reaction endothermic or exothermic? Ca(C2H3O2)2(s) = Ca2+(aq) + 2C2H3O2-(aq)
*November 13, 2012*

**Social Studies**

Veterans day When did this first come about And who did do this What does this day mean to vets And what are some events that day
*November 11, 2012*

**Chemistry**

So is B correct, can someone explain
*November 8, 2012*

**Math**

Hi Bob - I have 4 possible answers and cannot arrive at any of them by the above. My choices are (a)634mph (b)1038mph (c)761mph (d)113mph
*November 7, 2012*

**Math**

The radius of Earth is 3,959 miles. A spacecraft orbits 6 miles above the surface of Earth. The spacecraft completes 220° of a revolution around Earth in one day. What is the average speed of the spacecraft?
*November 7, 2012*

**physics**

A 10.4 kg object oscillates at the end of a vertical spring that has a spring constant of 17500 N/m. The effect of air resistance is represented by the damping coefficient b = 3.00 N¡¤s/m.
*November 6, 2012*

**Chemistry**

A sample of hydrogen is collected over water at a total pressure of 648 mm Hg at 22 oC. The vapor pressure of water at 22 oC is 19.8 mm Hg. The partial pressure of the hydrogen is __________.
*November 6, 2012*

**Social studies**

Thank you Ms. Sue Anyone else have info to add to Ms. Sue's answer.
*November 3, 2012*

**Social studies **

Brief synopsis on the cause, effect and result Of the attack on Pearl Harbor. Six and one half Pages already typed and on cardboard made A flag, have pictures, just need alittle help In summarizing some facts you may have with The facts I have for the cardboard display Board. ...
*November 3, 2012*

**Geometry**

A museum was designed without windows, but a truncated cylindrical skylight lightens the building. In the development of this, the architect has areas where the angles formed at junctures are vertical angles. If a pair of vertical angles measures 5x - 54 and 3x -24, find the ...
*October 31, 2012*

**Algebra**

Tina's change of $1.35 consisted of quarters and dimes only and she received twice as many dimes as quarters. How many dimes were there?
*October 30, 2012*

**Algebra**

At its grand opening, the gutherie market distributed two different types of souvenirs. One type costs 20 centseach, and the other type costs 25 cents each. One thousand souvenirs were distributed in all. If the cost of these souvenirs was $220, how many of each type were ...
*October 30, 2012*

**Algebra**

The length of a rectangular playground exceeds twice its width by 25 meters, The perimeter of the playground is 650 meters. Find the demensions of the playground.
*October 30, 2012*

**Chemistry**

A sample weighing 3.064 g is a mixture of Fe2O3 (molar mass = 159.69) and Al2O3 (molar mass = 101.96). When heat and a stream of H2 gas is applied to the sample, the Fe2O3 reacts to form metallic Fe and H2O(g). The Al2O3 does not react. If the sample residue weighs 2.407 g, ...
*October 29, 2012*

**Physics**

A rocket of mass 1.0x10^3kg is being fired to a height of 5.0 x 10^3 m. The rocket engine shuts off when the rocket reaches a height of 1.0x10^3m, and the rocket coasts up to 5.0 x 10^3 m. A) What velocity must the rocket have at the 1.0x10^3 m point to enable it to reach 5.0 ...
*October 28, 2012*

**Math**

A local animal shelter had four more than six times as many adult cats as kittens. After eight of the kittens were adopted, the shelter had four fewer than eight times as many adult cats as kittens. How many adult cats are at the shelter?
*October 27, 2012*

**chemistry**

If a current of 5.0 Amps is passed through the electrolytic cell for .5 hour, how should you calculate the number of grams of bromine produced?
*October 26, 2012*

**Chemistry**

I took that answer (0.327 mmol) and divided it by 50ml to get my Molarity. But this does not seem correct. What am I doing wrong?
*October 25, 2012*

**Chemistry**

A 50.0 mL sample containing Cd2 and Mn2 was treated with 49.1 mL of 0.0700 M EDTA. Titration of the excess unreacted EDTA required 17.5 mL of 0.0300 M Ca2 . The Cd2 was displaced from EDTA by the addition of an excess of CN–. Titration of the newly freed EDTA required 10....
*October 25, 2012*

**College Chemistry**

The specific Heat of gold is 0.128 J/g degrees Celsius. How much heat would be needed to warm 250.0g of gold from 25.0 degrees Celsius to 100.0 degrees Celsius
*October 25, 2012*

**Social studies**

What caused the Japanese ( what did the USA do) to attack Pearl Harbor.
*October 24, 2012*

**Social studies**

What caused the Japanese ( what did the USA do) to attack Pearl Harbor.
*October 24, 2012*

**chemisty 2**

Calculate the molarity (M) of a solution if you have 0.34 mol of NaOH in 19 ml of water
*October 23, 2012*

**Math**

2(2x+7)+(3x-5)=37
*October 22, 2012*

**Math**

2(2+7)+(6x-5)=37
*October 22, 2012*

**Math**

2(2+7)+(6x-5)=37
*October 22, 2012*

**math**

it has a picture with it but it wont past to the page
*October 22, 2012*

**math**

Write a number sentence for the model. Let one white tile equal +1 and one black tile equal –1. A. –14 – (–6) = –8 B. 14 – 6 = 8 C. –14 – 6 = –8 D. –14 – (–6) = 8 i put d but it was rong
*October 22, 2012*

**Math**

Radius of earth 3,959 miles Space shuttle orbits 200 miles above earths Surface Space shuttle completes 220 degrees of a Revolution around earth in one day What is the average speed of the space Shuttle
*October 21, 2012*

**Math**

Radius of earth 3,959 miles Space shuttle orbits 200 miles above earths Surface Space shuttle completes 220 degrees of a Revolution around earth in one day What is the average speed of the space Shuttle
*October 21, 2012*

**Algebra**

The cost of 5 similar cameras and 3 similar video cameras is $3,213. Each video camera costs 4 times as much as each digital camera. John buys a digital camera and a video camera. How much does he pay?
*October 19, 2012*

**CHEMISTRY**

NH4OH + H2O =
*October 17, 2012*

**physics**

what is a satellite's altitude above the surface of the earth if earth's mass is 5.98*10^24 kg and its radius is 6380 km?
*October 15, 2012*

**Chemistry**

How many moles of KBr are present in 120mL of a 0.290M solution?
*October 15, 2012*

**Chemistry**

How many milliliters of 7.00M HCl solution are needed to obtain 0.200mol of HCl?
*October 15, 2012*

**Physics**

What does the tire preseeure reading in your vehicle signify? Is it an absolute pressure?
*October 12, 2012*

**Chemistry**

Calculate the concentrations of all species in a 1.41 M Na2SO3 (sodium sulfite) solution. The ionization constants for sulfurous acid are Ka1 = 1.4× 10–2 and Ka2 = 6.3× 10–8. Na^+ = 2.82M SO3^2- = 1.40M HSO3^- = 0.00047M H2SO3 = OH^- = H^+ = I have been ...
*October 11, 2012*

**Chemistry**

Calculate the concentrations of all species in a 1.41 M Na2SO3 (sodium sulfite) solution. The ionization constants for sulfurous acid are Ka1 = 1.4× 10–2 and Ka2 = 6.3× 10–8. Na^+ = 2.82M SO3^2- = 1.40M HSO3^- = 0.00047M H2SO3 = OH^- = H^+ = I have been ...
*October 11, 2012*

**Physics**

Two boys of the same mass, 45 kg, are on a playground merry-go-round that has a diameter of 4.0 meters. Both boys are at the very edge of the ride. One boy stands with the coefficient of friction between his shoes and eh ride being .45 whereas the other is on his knees with a ...
*October 10, 2012*

**Elementary Math**

-0.1<=y<=0.1 <= means less than or equal to So if I break the statement up is y <= -0.1 y>=0.1 Correct? Please help I'm confused.
*October 10, 2012*

**Trigonometry**

If a stake is placed in the ground and is 20cm. high and casts a shadow 12.5 cm. long, what time is it? (The sun rises at 6 a.m. and is overhead at noon.)
*October 3, 2012*

**Math**

Which statement illustrates the additive identity? a)3+0=3 b)3-3=0 c)3*0=0 d)3*1=3
*October 2, 2012*

**Chemistry**

Calculate the pH of 7.2 × 10-8 M HCl. Report your answer to the hundredths place. Next, What fraction of the total H in this solution is from the HCl? Report your answer to the hundredths place. I apologize for the re-post, but I felt the previous one was labeled ...
*September 27, 2012*

**Analytical**

I apologize, I saw my mistake, and used HCL (7.2E-8)/(Total) and got: 51.245% This answer is still wrong, so now I am thoroughly confused.
*September 27, 2012*

**Analytical**

Thank you very much for the reply. I was able to solve for X (X = 7.03E-8), which I added to that of HCl (Total = 1.405E-7) and was able to obtain the pH (6.85, assume this answer is deemed correct). Here is my problem: I took the (H^+) from HCL (X?) and divided it by the (...
*September 27, 2012*

**Analytical**

Calculate the pH of 7.2 × 10-8 M HCl. Report your answer to the hundredths place. Next, What fraction of the total H in this solution is from the HCl? Report your answer to the hundredths place.
*September 27, 2012*

**algebra**

Your salary after a 3% salary increase if your salary before the increase was S, what is the algebric expression?
*September 26, 2012*

**Chemistry**

How to do significant values in Chemistry? I am totally stuck; I have no idea what to do? My teacher gave me C due to the significant value error. Please help
*September 26, 2012*

**math**

Many thanks!!!
*September 25, 2012*

**math**

an urn contains 3 blue chips and 7 red chips. sequentially draw 3 chips without replacement. what is the probability that all drawn chips will not be the same color?
*September 25, 2012*

**statistics**

an urn contains 3 blue chips and 7 red chips. sequentially draw 3 chips without replacement. what is the probability that all drawn chips will not be the same color?
*September 25, 2012*

**Algebra 1**

-2 - radical bar 5 over radical bar 10 simplify
*September 24, 2012*

**Algebra 1**

N/5-9=1/5
*September 23, 2012*

**math**

i mande 440 at a yard sell in 10 20 i need to have 5 more 10 than 20
*September 19, 2012*

**algebra 2**

y varies directly with x. When y = 20, x = 50. Find x when y = 36.
*September 19, 2012*

**Math Stats**

Chris is shopping for CDs and decides to purchase 3 movie soundtracks. The store has 9 different movie sountracks in stock. How many different selections of movie sountracks are possible?
*September 19, 2012*

**math**

1/3 + 5/6 = 7/6 7/6 + 3/8 = 37/24 37/24 = 1 13/24 or approx 1.5417
*September 19, 2012*

**health**

2. ________ in the pancreatic islets secrete the hormone insulin in response to a high concentration of glucose in the blood. A. Beta cells B. Alpha cells C. Gamma cells D. Sigma cells i put b but it said it was wrong
*September 18, 2012*

**Physics**

. The cheetah is the fastest running animal in the world. Cheetahs can accelerate to a speed of 20 m/s in 2.5 an can continue to accelerate to reach a stop speed of 29 m/s. Assume the acceleration is constant until the stop speed is reached and is zero thereafter. (a) Express ...
*September 16, 2012*

**math**

Ling bought 5 dishes and 9 glasses for $25.50. Each glass cost 50¢ cents more than each dish. How much did Ling spend the glasses
*September 16, 2012*

**trig**

I think you mean find all angles theta between 0 and 2pi.
*September 15, 2012*

**math**

What is 77 percent round to nearest tenth of a degcree
*September 14, 2012*

**writing**

Can someone check my answers for me? True or False... 1. TRUE you should use a comma before the word “and.” 2. FALSE The following is a sentence fragment: It no longer flies. 3. TRUE In the following sentence, the ()'d word is used correctly: The (Jones’) ...
*September 13, 2012*

**Chemistry**

prepare some 0.1 HCl by diluting the appropriate volume of stock 'conc' HCl to 1L. The stock acid is 37.4% HCl by weight and has a density of 1.19g/mL . Measure out the required volume with a graduated clyinder
*September 13, 2012*

**Physics**

In a stunt for an action movie, the 100 kg actor jumps from a train which is crossing a river bridge. On the river below, the heroine is tied to a raft floating towards a waterfall at 3 m s−1. The raft and heroine have a total mass of 200 kg. a If the hero times his ...
*September 12, 2012*

**Math **

What is 3/4 exivalent to? And 0.9 is exivalent to?(:
*September 11, 2012*

**Math**

5/6 is exivalent to? 0.85 is exivalent to? 3/4 is exivalent to? And 0.9 is exivalent to?
*September 11, 2012*

**science**

what are the number of digits in a measurement that are known with a certain degree of reliability?
*September 10, 2012*

**Geometry**

Use the figure below in which ec bisects ad at c. Find the value of x and the measure of the indicated segment.
*September 9, 2012*

**Calculus**

An open top box is made by cutting congruent squares from the corners of a 12 inch by 9 inch sheet of cardboard and then folding the sides up to create the box. What are the dimensions of the box which contains the largest volume?
*September 9, 2012*

**Algebra 1**

when the cost of a car is multiplied by 0.07 the results is $1710. Find the cost of the car.
*September 9, 2012*

**math**

2x^2+18x-20=0
*September 6, 2012*

**Math (Geometry)**

What is the midpoint of line BC with B (2,0) and C (-4,6)?
*September 6, 2012*

**finance**

A manufacturing company issues a bond with a 100,000 face value and a coupon rate of 7%. If the bond has a life of 30 years, pays annual coupons, and the yield to maturity is 6.8%, what percentage of the bond's price is the present value of the face value?
*September 6, 2012*

**chemistry**

How is overall molecular polarity affected by molecular symmetry (specifically shown for alkenes in book)? And what are the consequences for melting and boiling points (in cases of high molecular symmetry versus low molecular symmetry)? I looked for help in the book but it ...
*September 5, 2012*

**chemistry**

What is high molecular symmetry and low molecular symmetry and give examples of both please help!!!
*September 5, 2012*

**healthcare**

what is the effects of hippa and other regulations on the use of these media for health care communication?
*September 5, 2012*

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