Wednesday

July 1, 2015

July 1, 2015

Total # Posts: 102

**chemistry**

Aspirin is a monoprotic acid called acetylsalicylic acid. Its formula is HC9H7O4. A certain pain reliever was analyzed for aspirin by dissolving 0.311 g of it in water and titrating it with 0.0398 M KOH solution. The titration required 22.32 mL of base. What is the percentage ...
*June 14, 2015*

**chemistry**

"Stomach acid" is hydrochloric acid. A sample of gastric juice having a volume of 6.68 mL required 13.90 mL of 0.0161 M KOH solution for neutralization in a titration. What was the molar concentration of HCl in this fluid? C(HCl) = If we assume a density of 1.00 g mL...
*June 14, 2015*

**chemistry**

A student prepares a solution of hydrochloric acid that is approximately 0.1 M and wanted to determine its precise concentration. A 25.00 mL portion of the HCl solution is transferred to a flask, and after a few drops of indicator are added, the HCl solution is titrated with 0...
*June 14, 2015*

**chemistry**

A 12.6 mL sample of vinegar, containing acetic acid, was titrated using 0.542 M NaOH solution. The titration required 24.1 mL of the base. what is the molar concentration of acid in the vinegar?'
*June 14, 2015*

**chemistry**

148 mL of 0.325 M MgCl2 is mixed with 68.7 mL of 0.388 M NaOH and allowed to react completely. how many grams of Mg(OH)2 will form?
*June 14, 2015*

**navarro college biology**

RNA processing
*June 13, 2015*

**chemistry**

Suppose 148 mL of 0.325 M MgCl2 is mixed with 68.7 mL of 0.388 M NaOH and allowed to react completely. Volume change at precipitation can be ignored. How many grams of Mg(OH)2 will form? g the tolerance is +/-2% What is the molar concentration of Mg2+ in solution? M the ...
*June 13, 2015*

**c**

mixture is prepared by adding 27.0 mL of 0.169 M Na3PO4 to 35.1 mL of 0.234 M Ca(NO3)2. (a) What mass of Ca3(PO4)2 will be formed? (b)What will be the concentrations of each of the ions in the mixture after reaction? Put your answers with 3 significant digits. Ion ...
*June 13, 2015*

**chemistry**

'24.6 mL of 0.488 M NaCl is added to 24.6 mL of 0.312 M AgNO3. How many moles of AgCl would precipitate? What would be the concentrations of each of the ions in the reaction mixture after the reaction? Ion Concentration (M) Ag+ M NO3- M Na+ M Cl- M'
*June 13, 2015*

**chemistry**

23.8 ml of a 2.0 mol/l surfuric acid solution reacted completely with 68.0 ml of potassium hydroxide. find the concentration of potassium hydroxide
*June 12, 2015*

**chemistry**

there is one mole of H2SO4 AND TWO MOLES OF KOH 0.0476 MOLE H2SO4(2MOLES KOH/ONE MOLE H2SO4) TWICE THAT OF THE BALANCED EQUATION 0.0952 MOL KOH/0.068 LITERS KOH =1.4 MOLE/LITER KOH
*June 12, 2015*

**chemistry**

23.8 ml of a 2.0 mol/l surfuric acid solution reacted completely with 68.0 ml of potassium hydroxide. find the concentration of potassium hydroxide
*June 12, 2015*

**chemistry**

Calculate the number of moles of each of the ions in the following solution: 30.8 mL of 0.507 M AlCl3
*June 10, 2015*

**chemistry**

using M1*V1=M2*V2 why does this not work?
*June 10, 2015*

**chemistry**

How many milliliters of water must be added to 153.2 mL of 2.73 M KOH to give a 1.68 M solution?
*June 10, 2015*

**north seattle college**

2CH3OH + 3O2→ 2CO2 + 4H2O When 9.63 g of CH3OH was mixed with 15.7 g of O2 and ignited, 9.46 g of CO2 was obtained. What was the percentage yield of CO2?
*May 17, 2015*

**Biology**

I need help with the life cycle of an ostrich! And what could go wrong with the development. I don't understand if it's bacterial or viral infections that may occur...
*October 9, 2014*

**math**

i am a number between 5 and 10. my decimal is in tenths. the sum of my digits is 10. what number could i be?
*October 3, 2014*

**math**

what is the integral of sin^5(6x)dx
*June 27, 2014*

**Chemistry**

From the following data at 25°C, H2(g) + Cl2(g) → 2HCl(g) ΔH0 = −185 kJ 2H2(g) + O2(g) → 2H2O(g) ΔH0 = −483.7 kJ Calculate ΔH0 at 25°C for the reaction below. 4HCl(g) + O2(g) → 2Cl2(g) + 2H2O(g)
*June 18, 2014*

**Geometry**

at 10 feet away from the base of a tree, angle the top of a tree males with the ground is 61 degrees. of the tree grows at an angle of 78 degress with the respect to the ground, how tall is the tree to the nearest foot?
*June 1, 2014*

**Physics**

I'm having trouble setting up/solving this physics problem? Can someone please help me? Thank you. A 4700 kg lunar lander is in orbit 45 km above the surface of the moon. It needs to move out to a 340-km-high orbit in order to link up with the mother ship that will take ...
*April 4, 2014*

**Math**

Historically, an acre was the amount of land that an ox could plow in one day, which was deemed to be 4,840 square yards. Supposing that an ox could plow 4,840 square yards in a day, how manyyears would it take an ox to plow a square mile?
*March 26, 2014*

**Math**

The Brock family uses a 12-cup coffee maker, which leaks. For every 6 cup of coffee brewed, 1/12 cup leaks out. Mrs. Brock makes a full pot. If 4 coffee drinkers receive the same amount, how many cups (use a mixed number) will each individual receive?
*March 26, 2014*

**Math**

Jan is making a 3-tier wedding cake for 300 guests. She will make the cake for $3 per serving with the following specifications: -Each serving is 4 inch.3 -Each tier must be smaller than the tier below it. -Each square tier is 4 in. tall with a side length of 16 in., 14 in., ...
*March 26, 2014*

**Science**

a layer of ice has an area of 35m2 and is 2.5cm thick and is -7.5'c. how much water (in kilograms) is needed to melt the ice?
*March 22, 2014*

**Trigonometry**

Consider the triangle ABC. Suppose that C=69 degrees, a=45 and b= 9 Carry your intermediate computations to at least four decimal places, and round your answers to the nearest tenth. List all solutions A= B= c=
*March 18, 2014*

**Mathematics**

Suppose that 4 people sit in 4 chairs in a circle. How many different new seating arrangements are possible if each person can move 1 chair to the left or right or remain as is and if 1 person must be in each chair?
*March 12, 2014*

**Science/Math**

A sailboat heads north at 3 m/s for 1 hour and then tracks back to the southeast (at 45 degrees to north) at 2 m/s for 45 minutes. a. How far has the boat sailed? b. How far is it from its starting location? The textbook that included the word problem is: Basic Biomechanics ...
*September 30, 2013*

**Science/Math**

John and Al are in a 15 km race. John averages 4.4 m/s during the first half of the race and then runs at a speed of 4.2 m/s until the last 200 m, which he covers at 4.5 m/s. At what average speed must Al run to beat John? The textbook that included the word problem is: Basic ...
*September 30, 2013*

**Math/Science**

Wendell invests $10,000 in a stock portfolio made up of Petroleum Special at $30 per share, Newshoe at $12 per share, and Beans and Sprouts at $2.50 per share. He places 60 percent of the money in P.S. (Petroleum Special), 30 percent in N (Newshoe), and 10 percent in B & S (...
*September 30, 2013*

**Science/Math**

Math Problem page 18 Wendell invests $10,000 in a stock portfolio made up of Petroleum Special at $30 per share, Newshoe at $12 per share, and Beans and Sprouts at $2.50 per share. He places 60 percent of the money in P.S. (Petroleum Special), 30 percent in N (Newshoe), and 10...
*September 29, 2013*

**Science/Math**

Word Problem page 19 John and Al are in a 15 km race. John averages 4.4 m/s during the first half of the race and then runs at a speed of 4.2 m/s until the last 200 m, which he covers at 4.5 m/s. At what average speed must Al run to beat John? The textbook that included the ...
*September 29, 2013*

**Science/Math**

Word Problems pages 18-19 A sailboat heads north at 3 m/s for 1 hour and then tracks back to the southeast (at 45 degrees to north) at 2 m/s for 45 minutes. a. How far has the boat sailed? b. How far is it from its starting location? The textbook that included the word problem...
*September 29, 2013*

**Basic Biomechanics**

A sailboat heads north at 3 m/s for 1 hour and then tacks back to the southwest (at 45 degree to north) at 2 m/s for 45 minutes. a. How far has the boat sailed? b. How far is it from its starting location?
*September 29, 2013*

**Basic Biomechanics**

John and Al are in a 15 km race. John averages 4.4 m/s during the first half of the race and then runs at a speed of 4.2 m/s until the last 200 m, which he covers at 4.5 m/s. At what average speed must Al run to beat John?
*September 29, 2013*

**Basic Biomechanics**

Wendell invests $10,000 in a stock portfolio made up of Petroleum Special at $30 per share, New shoes at $12 per share, and Capital beans and Sprouts at $2.50 per share. He places 60 percent of the money in P.S., 30 percent in N, and 10 percent in B & S. With market values ...
*September 29, 2013*

**Biomechanics**

A sailboat heads north at 3 m/s for 1 hour and then tracks back to the southeast (at 45 degrees to north) at 2 m/s for 45 minutes. a. How far has the boat sailed? b. How far is it from its starting location?
*September 27, 2013*

**Biomechanics**

John and Al are in a 15 km race. John averages 4.4 m/s during the first half of the race and then runs at a speed of 4.2 m/s until the last 200m, which he covers at 4.5 m/s. At what average speed must Al run to beat John?
*September 27, 2013*

**Basic Biomechanics**

Wendell invests $10,000 in a stock por5tfolio made up of Petroleum Special at $30 per share, Newshoe at $12 per share, and Beans & Sprouts at $2.50 per share. He places 60% of the money in P.S., 30% in N, and 10% in B & S. With market values changing (P.S. down $3.12, N up 80...
*September 27, 2013*

**math**

The area of a rectangle is 15 + 5y square feet. Which of the following expressions could be the lengths of the sides of the rectangle, in feet? A.5 and 3y B.5 and 3 + y C.5 and 5 + y D.3 and 5 + 3y
*July 16, 2013*

**luella high**

to Steve these are the choices A. 5 and 3y B. 5 and 3 + y C. 5 and 5 + y D. 3 and 5 + 3y
*July 16, 2013*

**luella high**

The area of a rectangle is 15 + 5y square feet. Which of the following expressions could be the lengths of the sides of the rectangle, in feet?
*July 16, 2013*

**chemistry**

How many grams of ZnCl2 will be produced from 48 grams of zinc and 30 grams of HCL
*March 26, 2013*

**Chemistry 104**

A reaction rate doubles when the temperature increases from 0 degrees Celsius to 10 degrees Celsius, maintaining everything else equal. What is the activation energy for this reaction? (R = 8.314 J/mol K)
*March 8, 2013*

**Chemistry 104**

A reaction rate doubles when the temperature increases from 0 degrees Celsius to 10 degrees Celsius, maintaining everything else equal. What is the activation energy for this reaction? (R = 8.314 J/mol K)
*March 8, 2013*

**writing skills**

i need to write a essay on writing skills and writing assignment
*October 31, 2012*

**ap stats**

Minimum stays the same. Q1 might increase or stay the same. Median might increase or stay the same. Q3 might increase or stay the same. Maximum will increase. Mean will increase. Standard deviation will increase. Minimum and maximum should be obvious. Q1, median and Q3 are ...
*August 28, 2012*

**Physics HELP**

an object 3.00 cm high is placed 20.0cm from a convex mirror with a focal length of magnitude 8.00 cm. Find the position of the image. (Im using 1over20.00 + 1overQ = 1over-8.00) and the answer is q= -5.71cm. can someone tell how to do the math.. I suck at algebra
*June 16, 2012*

**statistics**

The Deborah Heart Institute performs many open-heart surgery procedures. Recently research physicians at the Institute developed a new heart bypass procedure that they believe reduces the average length of recovery. The hospital board will not adopt the procedure unless there ...
*April 18, 2012*

**Statistics**

Waste Today Services operates a garbage hauling company in a South Jersey city. Each year, the company must apply for a new contract with the city. The contract is in part based on the pounds of garbage hauled. Part of the analysis that goes into the contract development is an...
*April 4, 2012*

**math**

five hundred dollars
*March 12, 2012*

**chemistry**

For the reaction Al (s) + 3 HCl (aq) -> AlCl3 (s) + ₃/₂ H2 (g), it was observed that when 4.00 g of aluminum reacted with excess HCl, exactly 30.0 kJ of heat were released. The delta H for this reaction is a) – 91.3 kJ b) – 120 kJ c) – 202 kJ d...
*January 23, 2012*

**chemistry**

For the reaction Al (s) + 3 HCl (aq) -> AlCl3 (s) + ₃/₂ H2 (g), it was observed that when 4.00 g of aluminum reacted with excess HCl, exactly 30.0 kJ of heat were released. The delta H for this reaction is a) – 91.3 kJ b) – 120 kJ c) – 202 kJ d...
*January 23, 2012*

**healthcare administration**

◦What do you feel are the biggest weaknesses of the health care plan, and why? ◦Be sure to provide 2–3 weaknesses for each group (i.e. providers and patients), and explain your rationale for choosing each by supporting your thoughts with properly cited ...
*November 22, 2011*

**math**

one side of a square is decreased by 20% while its adjecent side is increased by 10%% forming a new rectangle. the area of the new rectangle formed is what percentage of the area of the original square?
*October 18, 2011*

**Physics**

A small rock is thrown vertically upward with a speed of 13.0 m/s from the edge of the roof of a 20.0 m tall building. The rock doesn't hit the building on its way back down and lands in the street below. Air resistance can be neglected. A.) What is the speed of the rock ...
*September 10, 2011*

**American Government**

The answer is C. I just finished this course.
*July 11, 2011*

**modern physics - relativity**

A photon of energy E collides with a stationary particle of rest mass m0 and is absorbed by it . (A) what is the velocity of resulting composite particle ? (B) What is the mass of the resulting composite particle ? use conservasion of energy / momentum please show working
*June 7, 2011*

**relativity **

Show that the following process is dynamically inpossible: A single photon in empty space is transformed into an electron and a positron, each with rest mass m(e).Explain in detail, How can this this process be made possible? In this case, what is the minimum photon energy ...
*June 7, 2011*

**relativity **

A particle called neutral pi meson (or pion) decays into two photons (and nothing else).If the pion (whose rest mass is 135Mev) is initially at rest, What are the energies of the photons? How are they moving with respect to each other ?
*June 7, 2011*

**Life orientation**

Environmental problem
*May 12, 2011*

**SQL**

You are missing the Group by: See the explanation from the Book The GROUP BY clause is valid only when used in conjunction with one of the SQL aggregate functions, such as COUNT, MIN, MAX, AVG, and SUM. For example, as shown in the first command set in Figure 7.26, if you try ...
*March 1, 2011*

**Basic Math**

1/4 = 15/60 1/5 = 12/60 What do you think?
*February 14, 2011*

**Basic Math**

Okay, Now that the common demoninator is 60, I now multiply. But where do I start? for example, I just leave the 1 alone because its a whole number. So now I multiply the 1/2 to 1 * 30 = 30 and 2 * 30 = 60 Do I do the same for the 1/3 and so on?
*February 14, 2011*

**Basic Math**

I need help adding fractions with different denominators. Here is the problem... 1 - 1/2 + 1/3 - 1/4 + 1/5 - 1/6 I can see that the demoninators increase. Since they are both addition and subtraction, how do I do this problem? Thanks, Walter, New York.
*February 14, 2011*

**math**

the lengths of corresponding sides of similar rectangles have a ratio of 7:4 the perimeter of the smaller rectangle is 80 ft. what is the peremiter of the larger rectangle?
*February 4, 2011*

**science**

You are designing a scale model of the solar system mercury it is 4,878 km in diameter.using the following scale factor, how large does your model of mercury need to be? A. 160cm B. 16cm C.146cm D.30cm
*January 26, 2011*

**Math**

it has a 4 added to it every time. but it just doesnt sound right because 4+4 is 8 not 44 so what other word can i use? * sorry its *going and *each and d) is like 1*2=2, 2*3=6, 6*7=42, 42*43=1806, 1806*1807=3263442 but i do not know how to put it into words.
*December 17, 2010*

**Math**

ya i cant describ things very well and a) was easy i think i got c) c)starting with two and ging up by multiplying wach new # by 5 i cant figure out the rest
*December 17, 2010*

**Math**

can u just tell me in sentences? i do not know how to put them into words.
*December 17, 2010*

**Math**

make a conjecture (obsevations based on patterns) for each sequence below. a)7,10,13,16 b)4,44,444,4444,44444 c)2,10,50,250 d)1,2,6,42,1806,3263442
*December 17, 2010*

**Math**

start with the word RODE. change one letter at a time to form a new until u have the word FILM. the best solution has the fewest steps.
*December 16, 2010*

**Biomechanics**

A pitched ball with a mass of 1 kg reaches a catcher's glove traveling at a velocity of 28 m/s. How much momentum does the ball have? how much impulse is required to stop the ball? If the ball is in contact with the catcher's glove for 0.5 s during the catch, how much ...
*November 21, 2010*

**English**

Devil in the White City Chicago World's Fair benefits and downfalls... I need to write an essay on The Devil in the White City. I read the book and i have a pretty firm grasp on it, but im still having trouble finding events and ideas that occur that happen in the Gilded ...
*September 15, 2010*

**algebra**

thanks. i wasnt sure whether to divide n or divide the four, that's all. -walter
*September 6, 2010*

**algebra**

When the quotient of a certain number and 6 is decreased by 14, the result is 4 find the number.
*September 6, 2010*

**spanish**

ayer maria y Javier _______ a la playa con sus amigos.______ 2. La pelicula del sabado por la tarde __________ muy bonita.___________
*February 23, 2010*

**Algebra II**

Y=-16X^2+100X+6 where x is the time in seconds and Y is the height in feet. find the zeros of the function? What do the zeros represent and are they realistic? and about how high does the rocket fly before hitting the ground?
*February 14, 2010*

**Math-Fair Game question**

What is the answer of is finish first a fair game
*January 23, 2010*

**com 140 Contemporary Business Communication**

Characteristics of Interpersonal Communication Im having a little problem with this assignment not really sure what to do. There are 2 section on ths assignment 1 is Instructor message and 2 is Class mate message. In each section ther are 4 categories and the are. *PURPOSE *...
*April 8, 2009*

**arithmetic math**

For each of the following expressions, show each step a student would folow to mentally perform the calculations in the whole numbers. For each step, identify the law, definition , axiom ec that was used to roduce that step. 345+641+255+359
*January 25, 2009*

**basic math**

say i have something like (2/3)-(1/3) ---------------- 3 do i multiply the top this way (1/3)(3/1) by flipping the denominator or multiply it like this (1/3)(1/3)
*May 15, 2008*

**trig**

Work out the following identities a)sin pheta / cos pheta b)tan pheta cos pheta
*April 8, 2008*

**trig**

If a = 5 cm and b = 3cm, use the Pythagorean Theorem to find c
*April 8, 2008*

**chemistry**

Given the equilibrium system PCl5(g) <---> PCl3(g) + Cl2(g) K = 12.5 at 60 degrees Celsius. A 1.0-L reaction vessel is analyzed and found to contain 3.2 mol Cl2(g), 1.5 mol PCL3(g) and 3.0 mol PCl5(g). Show that the reaction mixture has not yet reached equilibrium
*April 8, 2008*

**Accounting question..**

Having trouble figuring out how to do this problem for my accounting homework.. any help would be greatly appreciated..the information given goes as follows.. On 1/1/08 you issue $400,000 of 7%, 10 year bonds that pay intrest semiannually. The Market intrest rate is 8% The ...
*November 27, 2007*

**maths**

solve for x 8=6^x using logs
*November 12, 2007*

**maths**

solve for x
*November 12, 2007*

**maths**

solve the following equation for x
*November 12, 2007*

**algebra**

can you show how to solve for x x+1/x + 6/2x-3 =0
*November 1, 2007*

**maths**

factorise the following equation 680x3-1407x2-614x+285 where x2 x3 mean x to the power of
*October 26, 2007*

**maths**

solve the following equation for x (x+1/x) + (6/2x-3)=0
*October 23, 2007*

**maths**

rearrange the following equation to find x in terms of y and t y(y-x)=3t(3t+x)
*October 23, 2007*

**algebra**

solve the following simultaneous equation algebraically,for a and b 8a+5b=23 12a+3b=12
*October 23, 2007*

**chemistry**

if you added sulfuric acid to calcium nitrate what products in addition to calcium sulphate would you get if any ? if you start with calcium nitrate mixed into H2SO4 (aq), wouldn't you get a solution of nitric acid? H2SO4 + Ca(NO3)2 >>> 2 HNO3(aq) + CaSO4(s)
*August 13, 2007*

**chemistry**

write a balanced chemical equation for calcium nitate plus sulfuric acid produces calcium sulphate and ? This is a metathetical reaction, I think more properly called a double displacement reaction now. Just change + and - partners. Ca(NO3)2 + H2SO4 ==> CaSO4 + HNO3. I will...
*August 9, 2007*

**chemistry**

Given a solution in moles per litre how would you convert to parts per million)ppm.) could you help,no other information given apart from solution contains a known concentation of aluminium mols/L. Convert mols to grams. That will be grams per 1000 mL. Convert that to mg/L. ...
*August 9, 2007*

**chemistry**

calcium nitrate + sulfuric acid =caso4+? write a balanced chemical equation for this reaction including states. Ca(NO3)2 + H2SO4 ==> CaSO4 + 2HNO3 You don't have enough information to provide states. CaSO4 will be a solid so you write CaSO4(s). H2SO4 will be (l) if it ...
*July 30, 2007*

**chemistry**

write a balanced chemical equation for the following reaction including states not complete; no question.
*July 30, 2007*