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October 23, 2014

Posts by Bob


Total # Posts: 2,436

math
Why couldn't the two elephants go swimming together?
March 17, 2009

Chemistry
A .405 g sample of gas contains .0050 moles. What is the molar mass of this gas? Please round your answer to the tenths place. I am confused by this. Molar mass = mass of sample/moles of sample The answer is either: molar mass = .405g/.0050 = 81 g/mol (I dividing mass by moles...
March 17, 2009

Chemistry
A 0.1300 g iron ore sample was dissolved in hydrochloric acid and the iron was obtained as Fe2+(aq). The iron solution was titrated with Ce4+ solution according to the balanced chemical reaction shown below. After calculation, it was found that 0.0259 g of iron from the ore ...
March 13, 2009

math
5/6=30/x You can see that 5 was multiplied by 6 to get 30. In order to keep the fraction the same, you'll also have to multiply the 6 in the denominator by 6 to get 36 as your value for x, which in this case represents the height of the tree in feet.
March 13, 2009

chem
Why do we use excess reactants in a chemical reaction? Why are percent yields usually less than 100%? Is it because we want to maximize the amount of products produced, and reactions usually end up in a loss of reactants to the air, etc?
March 13, 2009

Math
(2/9)(4/8)=1/9 ( Remember that when you take a marble out, the total goes from 9 to 8 )
March 11, 2009

math
You open the book to page 24 and 25. (They have to be consecutive integers like the pages in a book). 24*25=600.
March 11, 2009

Chemistry
An iron ore sample was dissolved in hydrochloric acid and the iron was obtained as Fe2+(aq). The iron solution was titrated with 38.54 mL of 0.471 M Ce4+ solution according to the balanced chemical equation below. Ce4+(aq) + Fe2+(aq) -> Ce3+(aq) + Fe3+(aq). Calculate the ...
March 11, 2009

math6
how do you know????????????????
March 9, 2009

math6
whats between 2 1/2 & 3 next questioned whats beetween 3 1/2 & 4
March 9, 2009

math6
whats between 2 & 2 1/2
March 9, 2009

Math
asdfghjkllqwertyuiopzxcvbnm
March 9, 2009

physics
55555577657374383284894270000000 N
March 9, 2009

Chem
Determine the number of moles of N atoms in 43.5 g of Mg(NO3)2. Textbook answer: 1.43 mol N My answer: 43.5 g Mg(NO3)x x (1 mol Mg(NO3)2/148.313 g Mg(NO3)2) x (2 mol N/1 mol Mg(NO3)2) = .293 Can tell me where i went wrong?
March 8, 2009

Another Chem Problem
Alright, now I am starting to understand. Thanks!
March 8, 2009

Another Chem Problem
Calculate the total number of F (Fluorine) atoms in 12.15 mol C2HBrClF3. The answer is 2.195 x 10^25 atoms, but I am not sure how they got there. Can anyone give me a hint how to get started? If needed (i'm not sure), the moleculatr mass of C2HBrClF3 is 197.381.
March 8, 2009

Chemistry
Calculate the total number of atoms in 0.00102 mol CH3(CH2)4CH2OH The answer in the back of my book says 1.29 x 10^22 but i do not understand how they got to that answer. Will someone please show me how they would set up the problem. I though all you had to do was calculate 0....
March 8, 2009

Math pizzazz worksheet answers
0mmmmmmmmmmmm
March 8, 2009

Operations Management
The maintenance department of a hospital uses 816 cases of liquid cleanser annually. Ordering costs are $12, carrying costs are $4 per case a year, and the new price schedule indicates that orders of less than 50 cases will cost $20 per case, 50 to 79 cases will cost $18 per ...
March 7, 2009

Math/ Algebra
That is the Pythagorean theorem, which states that: in any right triangle, the area of the square whose side is the hypotenuse is equal to the sum of the areas of the squares whose sides are the two legs.
March 7, 2009

Math/ Algebra
Then that should be your answer
March 7, 2009

Math/ Algebra
Are you solving for anything? You can rewrite that as: b^2/[(6a^5)(c^3)]
March 7, 2009

math
Is the second part of that 3^(-2c) or 3^(-2)c?
March 7, 2009

6th grade Math
Thanks Ms. Sue, you help everyone on everything, your a big help!
March 2, 2009

6th grade Math
I don't get this question, can someone please explain it, thanks. Heres the question: A lighthouse beacon can be seen 24 mi in all directions. What is the area over which the beacon can be seen? - I think it's circumfrence, but I don't really know what to do. ...
March 2, 2009

physics
A flight attendent pulls her 78.6 N flight bag a distance of 344 m along a level airport floor at a constant velocity. The force she exerts is 44.8 N at an angle of 64.2 degrees above the horizontal. Find the coefficient of kinetic friction between the flight bag and the floor...
March 1, 2009

math ws
Hey
March 1, 2009

Chemistry: Molarity
4.82 mL of a 0.262 M NaOH solution reacts completly with 4.79 mL of HCl solution according to the balanced chemical reaction shown below: HCl (aq) + NaOH (aq) -> NaCl*aq) + H2O (I) What is the molarity of the HCl solution? 4.82 x (1L/1000 mL) = .00482L 4.79 x (1L/1000 mL...
March 1, 2009

Chemistry
Alright, I see my error. I appreciate the help :)
February 28, 2009

Chemistry
Aren't you looking for the molarity in this equation. If so, the molarity equation is M = moles of solute / Liters of Solution
February 28, 2009

Chemistry
Use the dilution relationship (Mi x Vi = Mf x Vf) to calculate the volume of 0.500 M NaOH needed to prepare 500 mL of .250 M NaOH. This is my work ? L Solution = 500mL x (1L/1000mL) = .500L ? mol NaOH = .500 L Solution x (0.250 M NaOH/1 L Solution) = .125 mol NaOH ? L solution...
February 28, 2009

3rd grade math
the greens family they had 8 people plus 2 they r going to disenyland they have $3.40 and each person cost 38 cents will they hav enough money to go to thier destionation please explain
February 27, 2009

physics
A mass of .50 kg attached to a vertical spring stretches the spring 37 cm from its original position. The accel of gravity is 9.81 m/s2. What is the spring constant?? Answer in units of N/m
February 25, 2009

biology
a fatty acids is most closely associated with what?
February 25, 2009

6th grade Social Studies
Thanks.
February 24, 2009

6th grade Social Studies
Well, This is my box's [ ] [O] [ ] [ ] [S] [ ] I don't think its frozen. ~Thanks
February 24, 2009

6th grade Social Studies
Crossword- 3 DOWN The most common type of land in Russia. 6 (Six) boxs.
February 24, 2009

Physics
You dip your finger into a pan of water twice each second, producing waves with crests that are separated by 0.15 m. a) determine frequency of these water waves in units of Hz?? b) determine the period of these water waves in units of s. ?? c) determine the speed of these ...
February 24, 2009

Physics
When these two spheres come in contact, the stronger forces of repulsion on the second sphere will move two electrons onto the first sphere. When this occurs, the electrical forces will be in balance and there will be no further net movement of electrons.
February 24, 2009

Chemistry
What is the theoretical yield of calcium carbonate if 2.97 grams of calcium chloride dihydrate reacts with excess sodium carbonate according to the balanced chemical reaction shown below? CaCl2•2H20(aq)+Na2CO3(aq)->CaCO3(aq)+2NaCL(aq)+2H20(I) Please use molar mass ...
February 23, 2009

Chemistry
I apologize about the length of the message. This will be the last long one I post. To figure out the molar mass of CaCl2•H2O (rounding to the hundredths place), I did Ca = 40.08 Cl2 = (35.45) x 2 = 70.9 2H2O = (18.02) x 2 = 36.04 40.08 + 70.90 + 36.04 = 147.02 g/mol 2....
February 22, 2009

Chemistry
Hi, I have a few questions that I am struggling with. Any help would be greatly appreciated. Question 1 Calculate the molar mass of calcium chloride dihydrate, CaCl2 • 2H2O. Please use the Periodic Table values rounded to the hundredths place for your calculation and ...
February 22, 2009

SAT Essay
off topic. its not about failure its about expectations
February 18, 2009

math
First rearrange the equation into Y=mx+b form. where m represents the slope & y represents the Y intercept. The X & Y represent the two coordinates that you are solving for. When you rearrange it into y=mx+b form then the equation should read y=3x-5. 3 is your slope and -5 is ...
February 17, 2009

Math
francois is stokcing a new fish pond on his farm. The pond is filling slowly and the volume of water in it can support a certain number of fish,(variable-F). F=42m+250, where m is the number of months the pond has been filling. the pond was stocked initially with 110 fish, a ...
February 17, 2009

math
u first have to rearrange this equation so it is in y=mx+b form after u do that u first graph the y-intercept then depending on ur slope u grpah it if u slope is 2 that basically means 2 over 1. the rise is 2 and run 1. so u go up 2 from ur y-intercept and 1 right and u ...
February 17, 2009

physics
a 1600-kg vehicle moves with a velocity of 19.5 m/s. calculate the power required to reduce the velocity to 3.20 m/s in 11.0 s
February 16, 2009

Microeconomics
1. A country's consumption possibilities frontier can be outside its production possibilities frontier if a. the country engages in trade. b. the citizens of the country have a greater desire to consume goods and services than do the citizens of other countries. c. the ...
February 13, 2009

Microeconomics
1. A country's consumption possibilities frontier can be outside its production possibilities frontier if a. the country engages in trade. b. the citizens of the country have a greater desire to consume goods and services than do the citizens of other countries. c. the ...
February 13, 2009

sociology perspective
do your own homework
February 12, 2009

Physics
An engine has a hot reservoir of 520K and a low temperature reservoir of 330K. What is the theoretical efficiency of this engine? Answer in units of % I got 36.5% but the teacher is saying that's wrong!! Please help with calculation.
February 11, 2009

math
g(13)= 3(13)-2 =39-2 =37
February 10, 2009

physics
I used the theorem and got a answer of 37% but I don't think its right??
February 10, 2009

physics
An engine has a hot reservoir of 520K and a low temperature reservoir of 330K. What is the theoretical efficiency of this engine? Answer in units of %
February 10, 2009

math
1,000,000+245-4564+3984068568+45-21x75.5675x500,000 :]
February 10, 2009

calculus
Find a formula for the inverse of the function f(x) = (4 x-1)/(2x+3)
February 10, 2009

calculus
Find an equation of the tangent line to the following curve at the point (0, 4). xe^y+ye^x=4
February 10, 2009

physics
a 2390 kg car traveling to the west at 22.4 m/s slows down uniformly under a force of 8740 N to the east. (a) How much force would be required to cause the same acceleration on a car of mass 3140 kg? Answer in units N (b) How far would the car move before stopping? Answer in ...
February 9, 2009

Physics
A weight suspended from a spring is seen to bob up and down over a distance of 37 cm twice each second. What is frequency in units of Hz? What is the period in units of s.? What is the amplitude in units of cm?
February 9, 2009

U.S.History
in reference to your question about the Puritans. I believe the answer is B. The puritans came to America to set up a society without religious persecution
February 9, 2009

english
Excerpts from Walt Whitman’s Song of Myself Number 33 Space and Time! now I see it is true, what I guess'd at, What I guess'd when I loaf'd on the grass, What I guess'd while I lay alone in my bed, And again as I walk'd the beach under the paling stars...
February 9, 2009

chemistry help
how do you balance these chemical equations NH4)3PO4 + Mg (CH3COO)2 -> Mg3(PO4)2 + NH4CH3COO MoO3 + H2SO4 + Zn -> Mo2O3 + H2O + ZnSO4
February 8, 2009

chemistry need help asap
how do you balance these equations? Ag2O -> Ag + O2 C6H6 +O2 -> CO2 + H2O
February 8, 2009

algebra
5x=-2x-6
February 7, 2009

english paper
so basically i am "summarizing" all the different sources but i need to put it all at once...right?
February 6, 2009

english paper
Hello I have a quick question. I have to write an english paper on the recent issues in business. it says that "purpose in writing this report is to SYNTHESIZe current, reported information on a recent issue in bussiness" The reason why i have the work synthesize in ...
February 6, 2009

poop
i hate all of you
February 5, 2009

math
Farmer Brown had some animals. One-fourth were horses, one-half were cows, and the rest were pigs. He had 8 pigs. How many animals did he have altogether? I know you would get a common denominator for 1/4 and 1/2 which would be 4 so you would have 1/4+2/4= 3/4 and then take 4/...
February 4, 2009

algebra
Factor x^2+6x+5 and x^2+8x+15
February 3, 2009

algebra
Simplify x^2-16 and x^2-100
February 3, 2009

english
What information can you get from a poem?
February 2, 2009

algebra II
solve each equation. 5y-2(y+3)=4y
February 2, 2009

algebra II
Solve each a equation. 5x=-2x-6 -5y+7=-18
February 2, 2009

analogies
What is the analogy for South America: Brazil :: North America:
February 2, 2009

math
what is the greatest common factor of 106 and 320
February 1, 2009

chemistry
Hydrogen cyanide is produced industrially from the reaction of gaseous ammonia, oxygen, and methane. 2 NH3(g) + 3 O2(g) + 2 CH4(g) → 2 HCN(g) + 6 H2O(g) If 5.35 103 kg each of NH3, O2, and CH4 are reacted, what mass of HCN and of H2O will be produced, assuming 100% yield...
February 1, 2009

calculus
Compute the area of the region in the fi…rst quadrant bounded on the left by the curve y = sqrt(x), on the right by the curve y = 6 - x, and below by the curve y = 1.
January 31, 2009

calculus
Find the average value of the function on the given interval f(x) = 2x^3(1+x^2)^4, [0,2]
January 31, 2009

calculus
Consider the solid obtained by rotating the region bounded by the given curves about the line x = 6. y = sqrt(x), y = x Find the volume V of this solid.
January 31, 2009

calculus
Consider the solid obtained by rotating the region bounded by the given curves about the x-axis. y = 6 x^6 , y = 6 x , x >= 0 Find the volume V of this solid.
January 30, 2009

science245
In answer to your question yes these are some of the rudest people on the planet. I guess their brains are so huge with information that they do not have the capacity for compassion.
January 27, 2009

algebra
1. The time t that it takes for a salesman to drive a certain distance d varies inversely as the average speed r. It takes the salesman 4.75 h to travel between two cities at 50 mi/h. How long would the drive take at 50 mi/h?
January 27, 2009

algebra
The volume V of a gas varies inversely as the pressure P and directly as the temperature T. A certain gas has a volume of 20 L, and a temperature of 320 K, and a pressure of 1 atm. If the gas is compressed to a volume of 15 L and is heated to 330 K, what will the new pressure...
January 27, 2009

algebra
1. The time t that it takes for a salesman to drive a certain distance d varies inversely as the average speed r. It takes the salesman 4.75 h to travel between two cities at 50 mi/h. How long would the drive take at 50 mi/h?
January 27, 2009

algebra
Direct and Joint Variation 2. The volume V of a rectangular prism of a particular height varies jointly as the length l and the width w, and V = 224 ft when l = 8 ft and w = 4 ft. Find l when V = 210 ft and w = 5 ft.
January 26, 2009

math
Direct and Joint Variation 2. The volume V of a rectangular prism of a particular height varies jointly as the length l and the width w, and V = 224 ft when l = 8 ft and w = 4 ft. Find l when V = 210 ft and w = 5 ft.
January 26, 2009

U.S.History
yes that is the ansswer for sure. good job!
January 25, 2009

algebra
write in standard from: 8.36 x 10^5 and -6.43 x 10^-4
January 25, 2009

algebra II
f(x)=|x-2|-2
January 25, 2009

math
Can you tell me if this could be right? First take 10000x18=180,000 Second divide 180,000 by 12=15000 Third divide 15000by 5280= 2.84 which would round to 3 Please tell me if this could be right
January 25, 2009

math
would you not divide in the first step?
January 25, 2009

math
Suppose that humans walk about 10,000 steps perday on average. Your average step is probably about 18 inches. If so, how many inches per day do you walk? How many feet per day do you walk? How many miles per day do you walk, to the nearest whole mile?
January 25, 2009

math
(6) Which equation is equivalent to 4^-x=8? a. log8 4=x b. logx = -4 c. log -x 4=8 d. log 4 8= -x
January 23, 2009

algebra
i think it is d
January 23, 2009

algebra
Which best describes the following function? f(x)=2^3.5x-7 a. exponential b. linear c.cubic d. quadratic
January 23, 2009

math
What is $600 invested at 9% interest, compounded quarterly, worth in 3 years? a. $640.50 b. $641 c.$762 d.$784
January 23, 2009

algebra
Solve the equation 10 x = 20 for x. a. x=1/2 b.x=2 c.x=1.3 d.x=10
January 23, 2009

Math
Suppose that humans walk about 10,000 steps per day on average. Your average step is probably about 18 inches. If so, how many inches per day do you walk? How Many feet per day do you walk? How many miles per day do you walk, to the nearest whole number?
January 23, 2009

physics
How fast WAS it rolling on the table before it fell off. I don't think the height of the table (1.5m) or distance from table (.8m) are relavent to the problem. Is this a trick problem???
January 20, 2009

physics
A 72 g baseball rolls off a 1.5 m high table and strikes the floor a distance of .8 m away from table. How fast is it rolling on the table before it fell off?? Accel of gravity is 9.81 m/s2.
January 20, 2009

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