Monday

April 27, 2015

April 27, 2015

Total # Posts: 3,118

**Chemistry**

At a certain temperature, the equilibrium constant, Kc, for this reaction is 53.3. H2(g)+I2(g) <--> 2HI(g) Kc= 53.3 At this temperature, 0.300 mol of H2 and 0.300 mol of I2 were placed in a 1.00-L container to react. What concentration of HI is present at equilibrium? HI...
*March 8, 2013*

**physics**

A car with a weight of 5000.0 N is accelerated across a level surface at 2.5 m/s^2. What is the net force acts on the wagon? (g= 9.81 m/s^2)
*March 6, 2013*

**College Mathematics**

write the statement in symbolic form. Let p: the temperature is 90 degrees Let q: The air conditioner is working r: the apartment is hot. If the apartment is hot and the air conditioning is working, then the tempurature is 90 degrees.
*March 6, 2013*

**Chemistry 101**

2HCl(aq)+K2SO3(aq)➡️2KCl(aq)+SO2(g)+H2O(l) Is is a gas evolution reaction:)
*March 5, 2013*

**College Mathematics**

write the statement in symbolic form. Let p: The Temperatue is 90 degrees Let q: The air conditioner is working Let r: If the apartment is hot and the air conditioner is working, then the temperature is 90 degrees.
*March 5, 2013*

**College Mathematics**

write the statement in symbolic form. Let p: The Temperatue is 90 degrees Let q: The air conditioner is working Let r: If the apartment is hot and the air conditioner is working, then the temperature is 90 degrees.
*March 5, 2013*

**College Mathematics**

Construct a truth table for the statement (p<--->q)--->p
*March 5, 2013*

**math**

hi i wanted to know what is 1.8387 rounded three decimal places please im stuck
*March 4, 2013*

**calculus**

A cylindrical container is to hold 20π cm^3. The top and bottom are made of a material that costs $0.40 per cm^2. The material for the curved side costs $0.32 per cm^2. Find the height in centimeters of the most economical container.
*March 2, 2013*

**calculus**

Suppose you have 400 meters of fencing and you wish to enclose a rectangular space with two parallel partitions: What is the maximum total area of the enclosed space, in square meters?
*March 2, 2013*

**math**

Miss Ramirez has invested $6,000 at 5%. How much additional money must she invest at 8% so that her annual income from the two investments will be 6% of the total amount invested?
*March 2, 2013*

**AP Chem**

Is that because it's a solid and not a gas?
*February 26, 2013*

**AP Chem**

For the following equilibrium system, which of the following changes will form more CaCO3? CO2(g) + Ca(OH)2(s) <--> CaCO3(s) + H2O(l) deltaH(rxn) = -113 kJ My choices are: a) Decrease temperature at a constant pressure (no phase change) B) Increase volume at a constant ...
*February 26, 2013*

**6th grade math**

n/4+32=72 (sub. 32) n/4=40 (multiply by 4) n=160
*February 26, 2013*

**6th grade math**

Multiply both sides by 4
*February 26, 2013*

**Chem Help!!!!**

I balanced the equation and got 2Cr+3O2->2CrO3.. but I was informed that this is the incorrect answer
*February 25, 2013*

**Chem Help!!!!**

In an experiment, 0.771g Cr(s)reacts completely with 0.712g O2 to form a single solid compound. Write a balanced equation
*February 25, 2013*

**Chemistry Help!!!!!**

How many milliliters of 0.635M K2CrO4 are needed to precipitate all the silver in 410mL of 0.158M AgNO3 as AgCrO4 ?
*February 25, 2013*

**calculus**

At noon, you and I start at the same place, and then you head east at a speed of 5 kilometers per hour, and I head north at a speed of 4 kilometers per hour. After two hours, how fast are we moving apart, in kilometers per hour?
*February 23, 2013*

**Microeconomics**

Thanks, Anonymous...Although I understand the concept I need to actually see the formula. I am a visual kindda person.
*February 23, 2013*

**Microeconomics**

If fixed cost is $8,000, variable cost is $5,000 at an output of 2 and $9,000 at an output of 3, how much is marginal cost at an output of 3? Can someone show me how to do the formula step by step?
*February 23, 2013*

**reading **

Fill in the blank 1-2. Although Jenny chose the songs from her __ that she knew best, she wasn't complacent about being prepared. Afraid she would __ the night of the concert, she practiced the songs over and over. 3-4. The __ of the lecture was that although the United ...
*February 20, 2013*

**Intermediate reading**

Is this a correct sentence? The gist of the lecture was that although the United States encourages free trade, some other countries falter it
*February 20, 2013*

**Math help**

the answer is 40 years. Hope this helps
*February 20, 2013*

**Reading**

1. repertoire 2. hamper 3. gist 4. falter 5. variable 6. conducive 7. frenzy 8. paradox 9. bizarre 10. flaunt
*February 20, 2013*

**Reading**

Can you help me with the following sentences? 1-2. Although Jenny chose the songs from her __ that she knew best, she wasn't complacent about being prepared. Afraid she would __ the night of the concert, she practiced the song over and over. 3-4. The __ of the lecture was ...
*February 20, 2013*

**math**

Thank you c:
*February 20, 2013*

**math**

oh because i thought it was a negative and a positive so they cancel out but its 7x^2-6x-6? or...?
*February 20, 2013*

**math**

so would it be 7x^2-6??
*February 20, 2013*

**math**

what is the sum of (x^2-3x+2) and (5x^2-3x-8)? how would you solve this???? please help
*February 20, 2013*

**Chemistry**

Thank you
*February 20, 2013*

**Chemistry **

A thoroughly dried 1.281g sample of Na2SO4 is exposed to the atmosphere and found to gain 0.383g in mass. What is the percent, by mass, of Na2SO4*10 H2O in the resulting mixture of anhydrous Na2SO4 and the decahydrate
*February 20, 2013*

**Pre Cal**

Sec^2 2u-1/Sec^2 2u = Sin^2 2u
*February 19, 2013*

**MaTH**

the perpendicular line is -2 the parallel line is 3/2
*February 18, 2013*

**Chemistry**

A 62g piece of ice at 0 degrees celcius is added to a sample of water at 9 degrees celcius. All of the ice melts and the temperature of the water decreases to 0 degrees celcius. How many grams of water were in the sample
*February 17, 2013*

**English**

Are there cultures that should not be promoted in the early childhood education setting? Why or why not? Support your position.
*February 16, 2013*

**algebra**

Can you please help me with this problem? -7x-4x-5=9x
*February 14, 2013*

**math**

if the ratio of boys to girls is 3/4 and there are 49 students how many boys are there?
*February 14, 2013*

**Reading**

ok thanks
*February 13, 2013*

**Reading**

Is the correct answers 4. empathy 6. complacent 9. diligent 10. transcend
*February 13, 2013*

**Reading**

Is this the correct word for each sentence 1-2. Lynn begged the bank to __ the overdraft charge of thirty dollars, telling them that it would entirely __ her savings. 3-4. In high school, Julio was voted "Most Likely to Become a Psychologist." It was the __ of his ...
*February 13, 2013*

**Chem Help!!!!!**

Ha! I just saw your comment... I am indeed are you in his class or you've taken him before, Donovan?
*February 11, 2013*

**Chem Help!!!!!**

The angle iron pictured here is made of steel with a density of 7.78g/cm^3. (Figure 1) measurements are: 12.78cm 10.26cm 1.35cm 2.75cm 1.35cm
*February 11, 2013*

**College Physics 2**

A parallel-plate air capacitor is made from two plates 0.250 m square, spaced 0.70 cm apart. It is connected to a 140 V battery. a) What is the capacitance? C = 7.90×10−11 F b) What is the charge on each plate? Enter your answer as an absolute value of charge. Q = ...
*February 11, 2013*

**accounting**

Suppose that two years after the bonds were issued, the required interest rate fell to 7 percent. What would be the bonds’ value?
*February 11, 2013*

**business**

In portfolio analysis, the goal when purchasing leverage items is
*February 10, 2013*

**algebra**

8/3fg^2
*February 10, 2013*

**Chemistry**

I read this question wrong and posted it wrong...it should be which is incorrect? If this is the case shouldn't C be the correct one?
*February 10, 2013*

**Chemistry**

Consider the following equilibrium: NH4Cl(s)--->NH3(g) + HCl(g) Suppose a vessel containing NH4Cl(s), NH3(g) and HCl(g) is at equilibrium. If the volume of vessel is instantaneously doubled while keeping the temp constant when a new equilibrium is reacted, which of the ...
*February 10, 2013*

**Math**

x+ .76x =1.76x Or 1x+.76x=1.76x
*February 10, 2013*

**Math**

.76(.0200-x)=x .0152-.76x=x +.76x +.76x (x add to .76x = 1.76x) .0152=1.76x (divide by 1.76 to solve for x)
*February 10, 2013*

**math**

6x=-36 /6 /6 x =-6
*February 9, 2013*

**CHEM**

How many grams of magnesium chloride are needed to prepare 100ml of a 0.325 M MgCl2 solution?
*February 7, 2013*

**CHEM**

What is the molarity of potassium iodide solution prepared by adding 5.810g of KI to sufficient water to make a final solution volume of 250.0mL?
*February 7, 2013*

**CHEM**

What is the molarity of a calcium sulfate solution prepared by adding 27.89g of CaSo4 to sufficient water to make a final solution volume of 1.00L?
*February 7, 2013*

**CHEM**

How many grams of sodium chloride are required to prepare 1.00 liter of a 1.00M NaCl solution?
*February 7, 2013*

**math**

9*12=108 W+(w+44)=108 2w=64 W=32. -white roses
*February 7, 2013*

**math**

X+y=54 5x+20y=780 -5(x+y=54) -5x-5y=-270 5x+20y=780 15y=510 Y=34 X=20 5(20)+20(34)=780 Five dollars bills = 20
*February 7, 2013*

**Algebra 1- Math**

2x-3y =-3 -1(3x-3y=18) 2x-3y=-3 + -3x+3y=-18 (add two equations) -x = -21 x = 21 2(21)-3y =-3 42-3y=-3 -3y=-45 y=15
*February 7, 2013*

**math**

A man sells a nut mixture consisting of 1/3 pecans and 2/3 cashews. Pecans cost 3 times as much as cashews. if a pund of the mixture costs him $0.40, how much did he pay for a pond of cashews? a pound of pecans?
*February 7, 2013*

**Physics**

In a baseball a pitcher can accelerate a .15kg ball from rest to 98 mi/h in a distance of 1.7m a) what is the average force exerted on a ball during a pitch? b)If the mass of the ball is increased, is the force required of the pitcher increased, decreased or unchanged?
*February 7, 2013*

**MATH**

7s-5s+10<30 -10 -10 7s-5s < 20 2s < 20 \2. \2 S. < 10
*February 6, 2013*

**Math**

Tom spent 1/3 of his allowance at mall. Of the money he spent at the mall, he spent 3/5 of it on jeans. What fractions of his allowance did Tom spend on jeans?
*February 6, 2013*

**Algebra**

W(w+4)=77 W^2 + 4w - 77 = 0 (W-7)(w+11)=0 W-7=0 W=7 W+11=0 gives neg. ans. Length = 7+4=11 Width = 4
*February 6, 2013*

**physics**

a mass m=8 kg sits on top of an h=1.8 m high table. The angle of the ramp is theta= 35 degrees. What is the length of the ramp.
*February 5, 2013*

**Reading( Immediate)**

Thanks
*February 4, 2013*

**Reading( Immediate)**

Do you have a copy of the sentence check 2 questions for chapter 20 in the 4th edition of Improving Vocabulary Skill book by Sherrie L. Nist?
*February 4, 2013*

**CHem Help!!!!**

What Celsius temperature will the Fahrenheit thermometer be 4-times more than on the Celsius thermometer?
*February 4, 2013*

**Chem Help!!!!**

I just need a solution to the first half of the question I figured out the 2nd half
*February 4, 2013*

**Chem Help!!!!**

What Celsius temperature will the Fahrenheit thermometer be 4-times more than on the Celsius thermometer? At what Celsius temperature will the numerical reading on the Fahrenheit thermometer be 1/9 that on the Celsius thermometer?
*February 4, 2013*

**Chem Help!!**

thank you
*February 2, 2013*

**Chem Help!!**

A standard 1.000kg- mass is to be cut from a bar of steel having an equilateral triangular cross section with sides equal to 3.00in. The density of the steel is 7.70g/cm^3. How many inches long must the section of bar be?
*February 2, 2013*

**Chem Help!!**

ok cool thanks for your help
*February 2, 2013*

**Chem Help!!**

After I multiplied by 2 I got a final answer of 0.000556mm
*February 2, 2013*

**Chem Help!!**

When I converted with Devron method I got 27.8*10^-6mm When I did it Bob's way I got 27.8*10^-5 is this correct?
*February 2, 2013*

**Chem Help!!**

The volume of a red blood cell is about 90.0*10^-12cm^3 Assuming that the red blood cells are spherical, what is the diameter of a red blood cell in millimeters?
*February 2, 2013*

**Chemistry**

thank you
*February 2, 2013*

**Chemistry**

20.02cm*
*February 2, 2013*

**Chemistry**

The density of aluminum is 2.70 g/cm^3. A square piece of aluminum foil, 20.02 on a side is found to weigh 2.573g. What is the thickness of the foil, in millimeters?
*February 2, 2013*

**Chemistry**

when I was copying and pasting the problem the units and numbers did not transfer... I completely understand that you need these units
*February 2, 2013*

**Chemistry**

The density of aluminum is . A square piece of aluminum foil, 20.02 on a side is found to weigh 2.573 .What is the thickness of the foil, in millimeters?
*February 2, 2013*

**Chemistry**

1.006 g/ml 4.7% acetic acid by mass 3.00L
*February 2, 2013*

**Chemistry**

A vinegar sample is found to have a density of 1.006 and to contain 4.7 acetic acid by mass.How many grams of acetic acid are present in 3.00 of this vinegar?
*February 2, 2013*

**Chemistry**

Hey I tried that and still cant get the right answer. The answer that I got is 555.6 or 556 K and its not correct. What answer did you get?
*January 31, 2013*

**Chemistry**

At what temperature will the rate constant for the reaction have the value 6.5×10−3 M/s? (Assume k = 5.4 * 10^-4 M/s-1 at 599K and k = 2.8 * 10^-2 M/s at 683K .)
*January 31, 2013*

**Chemistry**

I am trying to determine which protein (in a given list) will stick most tightly to a cation exchange column at pH 7. I am unsure how to go about solving this.. We are given molecular weight, isoelectic point, and number of subunits for each protein. Where should I begin?
*January 31, 2013*

**Chemistry**

I am trying to determine which protein (in a given list) will stick most tightly to a cation exchange column at pH 7. I am unsure how to go about solving this.. We are given molecular weight, isoelectic point, and number of subunits for each protein. Where should I begin?
*January 31, 2013*

**goven**

Which one of the following is NOT widely regarded as a political ideal in America?
*January 29, 2013*

**Intermediate reading**

In questions 3 and 4 would the correct answer be: 3 prone , flippant 4. perception, impasse
*January 27, 2013*

**Intermediate reading**

Is question 3 and 4 correct
*January 27, 2013*

**Intermediate reading**

3.impasse, flippant 4. prone, perception
*January 27, 2013*

**Intermediate reading**

word choices: congenial, prone, flippant,rapport, impasse, rationale, perception, relentless, prompt, reprisal 1.Because Wade is so congenial and easy to talk to, we established a warm rapport the first day we met. 2. Although the company president explained rationale behind ...
*January 27, 2013*

**Intermediate reading**

Can you help me with the sentence check 2 Chapter 17 and 18 in the improving vocabulary skill workbook?
*January 27, 2013*

**math**

you fill up 40 gallon pool putting in 2 gallons water every minute, if someone scoops out 1 gallon every 8 minutes, how long would it take to fill the pool?
*January 24, 2013*

**science**

When you hit a nail into a board using a hammer, the head of the nail gets warm. In terms of kietic and thermal energy, describe why you think this happens.
*January 23, 2013*

**calculus**

Let f(x)=(2+x)2−4x. Note that f(x) is undefined at x=0. However, in this case, we can find a continuous function g(x) defined at x=0 that agrees with f(x) near x=0. Find the function g(x) that is equal to f(x) when x≠0 such that g(0)=limx→0f(x).
*January 19, 2013*

**calculus**

Let f(x)=x2+x−6x−2. Note that f(x) is undefined at x=2. However, in this case, we can find a continuous function g(x) defined at x=2 that agrees with f(x) near x=2. Find the function g(x) that is equal to f(x) when x≠2 such that g(2)=limx→2f(x).
*January 19, 2013*

**math**

A pattern for curtains calls for 2/3 of a yard of material. You want to shorten the curtains to2/3 of the height of the pattern. How much fabric is needed?
*January 18, 2013*

**Calculus**

Use a trig identity to combine two functions into one so you can solve for x. (The solution should be valid for any value of t). 3cos(t) + 3*sqrt(3)*sin(t)=6cos(t-x) I know that 6 cos(t-x) can be 6(cos(t)cosx(x)+sin(t)sin(x)) I dont know where to go from there though.
*January 15, 2013*