Thursday
October 2, 2014

Posts by JEFF


Total # Posts: 595

Chemistry
What volume of 0.5 N nitric acid would be required to completely neutralize 300 ml of 1.0 N sodium hydroxide?
October 6, 2010

Chemistry
If you had one gallon of concentrated hydrochloric acid (12 N) and added water to make dilute hydrochloric acid (6 N), how much dilute hydrochloric acid would you have?
October 6, 2010

physics
thank you !
October 5, 2010

chem
In the explosion of a hydrogen-filled balloon, 0.54 g of hydrogen reacted with 6.6 g of oxygen to form how many grams of water vapor?
October 4, 2010

marketing
Your team has been hired by ABC company’s senior management to conduct a research project. The company has 40 employees and has been in business for 25 years. The company offers sales & service on all sizes of new Xerox copiers. The company has been faced with decreasing ...
October 3, 2010

chemistry
Calculate the volume of 1.80 M \rm Na_3PO_4 in milliliters that contains 6.00 g of solute.
October 3, 2010

math figuire
Volts divided by the amount of resistance will give you the amps.
September 27, 2010

Biochem
The conc is 6.0M HCL
September 13, 2010

Physics
Two motorcycles are traveling due east with different velocities. However, 2.16 seconds later, they have the same velocity. During this 2.16-second interval, motorcycle A has an average acceleration of 1.30 m/s2 due east, while motorcycle B has an average acceleration of 19.4 ...
September 13, 2010

Pre Calc
From a committee of 6 people how many sub-committees of 3 can be formed, and with 7 people and with 8 people and with n people?
September 12, 2010

Pre Calc
How many triangle are determind by the vertices of a hexagon, heptagon, octagon, and n-gon?
September 12, 2010

Math
in salem, 42% of the registered voters are republicans and 44% are democrats. the other 217 are independents. how many registered voters are there in salem?
September 6, 2010

math
During a football game, two players try to tackle another play. One player applies a force of 50.0 N to the east. A second player applies a force of 120.0 N to the north. What is the total applied force? (Since force is a vector, you must give both the magnitude and direction...
September 5, 2010

Chemistry
A 4.50 g sample of LiCl at 250 C dissolves in 25.0 ml of water also at 25.0 C.? The final equilibrium temp of the resulting solution is 60.8 C. What is the enthalpy of solution, deltaHs, of LiCl expressed in kilojoules per mole.
September 5, 2010

CHEMISTRY
Explain why it is quantitatively not acceptable to titrate each of the vinegar samples with the NaOH titrant to the same dark pink endpoint?
August 27, 2010

algebra
The perimeter of a rectangle is 128m the length is 4m more than twice the width
August 23, 2010

statistics
which of the following statements are correct? a. a normal distribuiton is any distribution that is not unusual. b. the graph of a normal distribution is bell-shaped. c. if a population has a normal distribution, the mean and the median are not equal. d. the graph of a normal ...
August 16, 2010

statistics
indicate whether the given statement could apply to a data set consisting of 1,000 vlaues that are all differnt. a. the 29th percentile is greater thatn the 30th percentile b. the median is greater thatn the first quartile c. the third quartile is greater than the first ...
August 13, 2010

12th grade
The area of a circle is 28.26 square centimeters. What is its diameter (use 3.14 for ð)?
July 20, 2010

physics
A big yo-yo(radius .2m, mass 20kg) has a string wrapped about its circumference. If yo-yo falls, how far does it fall in 2 seconds? (The yo-yo is shaped like a disk)
June 29, 2010

chemistry
100 million automobiles contains 1.1 kg of CFC-12 and leaks 25% of its CFC-12(CF2Cl2) into the atmosphere per year, how much Chlorine in kilograms is added to the atmosphere each year due to auto air conditioners?
June 28, 2010

economics
By 2008 the US trade deficit was still very large (roughly 5% of gross income) and our net debt position was around $5 trillion (over 1/3 of gross income). Unfortunately, it also appears that we have fallen into a major recession of uncertain duration and depth. Discuss the ...
June 23, 2010

Accounting
Imagine you have been selected by your manager to present a training session to a group of new employees. The new hires do not have accounting backgrounds and have little or no work history in a responsibility center. The purpose of this training session is to explain the ...
June 7, 2010

Physics
A hunter aims directly at a target (on the same level) 125m away. If the bullet leaves the gun at a speed of 227 m/s, by how much will it miss the target? I'm not sure how to approach this problem. I know I need to find the horizontal distance traveled, probably by finding...
June 3, 2010

Algebra 2
I meant to type this one: If the sine of an acute angle is 0.8, what is the sine of twice that angle? 1.60 or .64? Thanks
May 28, 2010

Algebra2
I got it, .5
May 28, 2010

Algebra2
Help How do I figure out: (cos 40)(cos20) - (sin 40)(Sin 20) Thank you
May 28, 2010

Right Hand Rule
a) west b) zero deflection c) up d) down
May 21, 2010

algebra 2
I am taking an online class, and cant understand why when I calculate ona ti84 plus an answer I get decimal answer and my teachers answer is sq root, is there something I am not doing on my calculator? How do I convert. Example, teachers answer to the following was sin 315deg...
May 16, 2010

algebra2
Example, teachers answer to the following was sin 315deg = -sin 45deg = -sqrt2/2 I got a decimal answer.
May 15, 2010

algebra2
I am taking an online class, and cant understand why when I calculate ona ti84 plus an answer I get decimal answer and my teachers answer is sq root, is there something I am not doing on my calculator? How do I convert.
May 15, 2010

Chemistry
902 mL
May 15, 2010

statistics
The first class in a relative frequency table is 50–59 and the corresponding relative frequency is 0.2. What does the 0.2 value indicate?
May 14, 2010

Science
what is the relative location of the marine biome, specifically the ice cap biome?
May 13, 2010

chemistry
6) How many grams of copper (II) fluoride, CuF2, are needed to make 6.7 liters of a 1.2 M solution?
May 11, 2010

calculus
sum_(n=-1)^infinity(-1)^(n+1) (1/3)^n = 9/4~~2.25... How do you find that out? Is there a formula?
April 27, 2010

chemistry
Write a net equation for the reaction between aqueous solutions of HBr and NH3.
April 26, 2010

Finance
7.90%
April 21, 2010

math
Evaluate f(x)= 4x^2 - 2 for f(1/2)
April 19, 2010

managerial economics
a) Given total cost function as C=160+16Q+0.1Q(2){squared} and price equation P=96-0.4Q. Total Revenue function is R=PQ=96Q-0.4Q(2). The profit function is F=R-C=(96Q-0.4Q(2))-(160+16Q+0.1Q(2))=80Q-0.5Q(2)-160. Profit attains maximum when and is negative dF/dQ=0 and d(2)F/dQ(2...
April 11, 2010

chemistry
How many grams of oxygen are required to react with 0.128 lead(II) sulfide?
April 8, 2010

algebra
x – 2y = 6
April 8, 2010

Chemistry
This question is: How many orbitals are there in each of the following energy levels.. a) 1s b) 6p c) 10f d) 7d e) 5s Now.. do i use n^2 for the number of orbitals in each energy level? Ex. b) would be 36 OR can i state the number of orbitals in each sublevel using the shape? ...
April 4, 2010

Chemistry
Why do atoms display spectra?
April 3, 2010

chemistry
how did you get that?
March 21, 2010

Calculus
An isosceles triangle has a vertex at the origin. Determine the area of the largest such triangle that is bound by the function x^2 + 6y = 48. So, y=8 when x=0 making a vertical side equal to 8. I also determined that there is a zero at =/- the square root of 48, or ...
March 20, 2010

Calculus
The radius of a tank can not exceed 5m, and the height can not exceed 12 m. Is it possible to construct a tank with a volume of 900m^3? If it is possible, determine the minimum amount of material required to make the tank. When i solve it, the radius exceeds the restrictions...
March 19, 2010

physics
Evidence suggests that there are trillions of dollars' worth of minerals and metals buried in Near Earth Asteroids (the ones that come close to the Earth, not the ones in the asteroid belt between Mars and Jupiter). Many scientists think an asteroid mining mission is ...
March 18, 2010

Chemistry
I've been asked to find the IUPAC name for polyvinyl acetate. when i type it in google i keep getting butan-2-yl acetate. but isn't the IUPAC name for acetate ethanoate ..? so would the proper IUPAC name for PVA be butan-2-yl ethanoate?
March 9, 2010

Physics
What is the equation for work?
March 9, 2010

Middle school Math
Graph 3y-4=11 by finding intercept(s) How do you do this... Thanks
March 6, 2010

Math
Stop cheating. gtfo. (Like Kevin, there is no doubt in my mind that you will be victorious.)
March 6, 2010

Chemistry
I'm doing an intro to organic chem, and i'm looking at the functional groups of organic compounds. More specifically, I am looking at melting/boiling points. I keep reading that one has a greater m/b pt. than another, but another one has a greater m/b pt. that one but ...
March 6, 2010

French
I need help with grammar, can someone check it out for me? 1. Une valeur mobilière est un fongibles, un instrument négociable représentant une valeur financière. Les deux types de valeurs mobilières sont les actions et les obligations. 2. Une...
March 3, 2010

electric potential
Given a square of side length a = 6 cm. We place a charged particle at each corner, three of them carry +7 nC of charge and one carries the same amount of negative charge. What is the electric potential at the center of the square? Choose V = 0 V for a position very far from ...
February 24, 2010

Chemistry
What are the products when you add water to 2-methyl-2-pentene?
February 15, 2010

calculus
dh/dx x = 7 , h (x) = (x^-1/2 + 8x)(4 - x^-1)
February 8, 2010

Personal Finance
The Lees, a family of two adults and two dependent children under age 16, had a gross annual income of $68,000 for 2007. Determine their standard deductions, exemption, and child tax credit amounts, as well as their marginal and average tax rates assuming their filing status ...
January 28, 2010

10th grade
I need to unscramble the letters to this word from the renaissance. The letters are NWIHZGLCIRULI
January 27, 2010

science
An athlete throws a basketball through a hoop. The ball leaves his hands at a height of 2.5 m with a speed of 9.0 m/s. Calculate the speed of the ball when it “swishes” through the hoop. The hoop is at a height of 3.0 m and it is 5.0 m along the court from the ...
January 22, 2010

Math
Yes. X=2-2t y=3t
January 18, 2010

Physics
Two events that are simultaneous in one frame of reference will be: A) simultaneous in all frames of reference B) simultaneous in another frame that is moving in the opposite direction C) simultaneous in another frame of reference that is moving in the same direction D) ...
January 12, 2010

Math
If the digits 1 through 9 are written in order, it is possible to place plus and minus signs between the numbers or to use no operation symbol at all to obtain a total of 100. For example,1 + 2 + 3 + -4 + 5 + 6 + 78 + 9 = 100 Can you obtain a total of 100 using fewer plus or ...
January 11, 2010

Algebra
Let U = {u, n, i, t, e} A = {n, i, t} B = {n, e} C = {u, n, i, t, e} D = {u, e} Find each of the following: (a) A ¡ä B (b) C ¡å D (c) ¡ÂD¡Â (d) ¡ÂA ¡å D¡Â (e) B ¡ä ¡ÂC&...
January 11, 2010

Algebra
Given the following function rules and domains, find the associated ranges. (a) f(x) = 2x +3, Domain = {0, 1, 2} (b) f(x) = 0, Domain = {0, 1, 2} (c) f(x) = 2x + x2, Domain = {1, 0, 2}
January 11, 2010

Algebra
16
January 11, 2010

statistics
Question 1 Question 1 1. Question 1 text The head of the History Department wants to compare the averages of 2 different instructor’s to see if they differ. A sample of 15 students in Instructor A’s class has average of 74 with a standard ...
January 9, 2010

math
estimate 4/5of 49
January 6, 2010

math
6/11x32 by using estimating product
January 6, 2010

math
2/3x35 by using estimating product
January 6, 2010

math
3/4x35 by using estimating product
January 6, 2010

math
7/8x30 by using estimating product
January 6, 2010

math
5/8x41 by using estimating product
January 6, 2010

math
2/9x26 by using estimating product
January 6, 2010

math
2/9x26 by using estimating product
January 6, 2010

math
3/7x29 by using estimating product
January 6, 2010

math
1/2x17 by using estimating product
January 6, 2010

math
1/5x26 by using estimating product
January 6, 2010

math
3/8x17 by using estimating product
January 6, 2010

math
5/8x19 by using estimating product
January 6, 2010

math
4/7x20 by using estimating product
January 6, 2010

math
what is 1/5x24 by using estimating product
January 6, 2010

chemistry
51.4
December 15, 2009

math
Find the mean of the following set of numbers.7, 10, 9, 13, 6
December 13, 2009

math
hockey teams receive 2 points for every game won and i point for every tie. One year a team won a championship with 66 points. They won 12 more games than they tied, how many wins and how many ties did the team receive?
December 11, 2009

Science
You are floating motionless in outer space. Your mass is 70 kg. Your 70 kg transporter floats by and you attempt to bring in closer by flexing your right arm. Are you more likely to produce an isotonic or isometric contraction? Explain.
December 10, 2009

Science
You are floating motionless in outer space. Your mass is 70 kg. Your 70 kg transporter floats by and you attempt to bring in closer by flexing your right arm. Are you more likely to produce an isotonic or isometric contraction? Explain.
December 10, 2009

physics
1100g of ice at -50C is mixed with 100g of steam at 120C. Find out how much ice melts? The implied final temperature is 0C. Cice=0.5 Csteam=0.46 Hv=539 Hf =80 here is my work 1100(0.5)(0+50)+80m = 100(0.46)(120-0)+540(100) i am not getting the right answer
December 5, 2009

math
write an equation of the line containing the given point and parallel to the given line (-2,3)2x=7y+9
December 5, 2009

FINANCE
Collins Office Supplies is considering a more liberal credit policy to increase sales, but expects that 9 percent of the new accounts will be uncollectible. Collection costs are 5 percent of new sales, production and selling costs are 78 percent, and accounts receivable ...
December 3, 2009

College Math
Write the Unit price for the following item. $5.16 for a dozen oranges?
November 28, 2009

chemistry
At atmospheric pressure, a sample of O2 gas has a volume of 55mL at 27 degrees celcius. What volume in mL will the O2 gas occupy if the temperature is decreased 0 degrees C and the pressure is held constant?
November 24, 2009

programming
I got the the LineScrabble class: import java.io.*; public class LineScrabble extends Echo{ int max = 0; String bestLine = ""; public LineScrabble(String f) throws IOException { super(f); } int[] scrabbles = {1,3,3,2,1,4,2,4,1,8,5,1,3,1,1,3,10,1,1,1,1,4,4,8,4,10}; ...
November 24, 2009

programming
Can anyone help me with this really confusing programming problem? The board game scrabble works by assigning points to wooden tiles arranged in cells on a board. We'll simplify this considerably, and consider the following question. We begin with the letter-scoring scheme...
November 24, 2009

physics
A children's merry-go-round in a park consists of a uniform 200kg disk rotating about a vertical axis. the radius of the disk is 6 m and a 100kg man is standing on the outer edge when the disk is rotating at a speed of 0.20rev/s. how fast will the disk be rotating if the ...
November 21, 2009

physics
a uniform disk and a uniform sphere are rolled down an incline plane from the same point and intially they are at rest. Find the difference in time they arrive at a mark on the plane which is 6 meters from the starting point. The sphere has twice the mass and the same radius ...
November 21, 2009

physics
a uniform disk and a uniform sphere are rolled down an incline plane from the same point and intially they are at rest. Find the difference in time they arrive at a mark on the plane which is 6 meters from the starting point. The sphere has twice the mass and the same radius ...
November 21, 2009

AP Physics B
The college board website only has exams from 1999 to last years. Some how my teach has gotten ahold of the free response questions from like 1980 and he said that they are open to the public and can be found on the internet. I can't seem to find were they are all the ...
November 17, 2009

PreCalculus
why is -sin(380)/cos (380) equal to -tan(200) I don't see how it's 200 wouldn't it be -tan 380
November 15, 2009

calculus
calculate the lim as x-> pi (cos(x)+1)/(x-pi) using the special limit lim x->0 sinx/x
November 13, 2009

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