Monday
September 15, 2014

Posts by alex


Total # Posts: 2,556

chemistry
which one of the following is a direct result of "hard water"? a. formation of a bathtub ring b. discoloration of clothers c. water spots on dishes d. maeks your skin feel slipper to the touch. I think its A but just wanted to double check.
May 11, 2010

chemistry
in any experiment does water in a beaker absorb or release energy in the form of heat?
May 11, 2010

chemistry
the answer I got is 1027 J/g.. right??
May 10, 2010

nutritian
which of the following food items should have the highest energy content? a. nuts b. popcorn c. marshmallow d. apple
May 9, 2010

Chem 1LC
Could someone please help me with this problem!!?!? Thanks you so much!!! The reduction potentials for the species involved in an electrochemical cell are as follows: M+ + e– M is 0.50 V J+ + e– J is 1.20 V. All solutions are 1.00 M and J+ J is connected to M+ M. A) ...
May 3, 2010

math
Can someone please help me I can't figure this out Find the center and radius of the circle. (x - 4)2 + (y + 6)2 = 16
May 2, 2010

Algebra 2
a) A population of 460 animals that increases at an annual rate of 15%. Write an exponential function to model. b) Write an exponential function to model. Predict the value of the function after 5 years(nearest whole number). A population of 430 animals that decreases at ...
May 2, 2010

6th grade math
240
April 28, 2010

Chemistry
A pressurised can of whipped cream has an internal pressure of 1.33x105 Pa at 25.0 oC. If it is placed in a freezer at -15.0 oC, what is the new value for its internal pressure (in Pa)?
April 28, 2010

Algebra II
suppose you are biking down a hill at 24 mi/h. What is the angular speed, in radians per second, of your 27-inich-diameter bicycle wheel?
April 25, 2010

science gr.5
what 3 things would i miss the most if there were no pulleys and gears in the world?
April 25, 2010

math
The graph shows the y axis has a positive 5 on the top and a negative one the bottom. The X axis show the same the same thing
April 23, 2010

math
State the solutions, or estimated solutions, to each quadratic equation in Exercises 23–26 by examining the graph of the related quadratic function equation 2x2 - 3x - 4 = 0 and Graph:y=2x^2-3x-4 Can someone help me with this
April 23, 2010

math
Thank you so much
April 20, 2010

math
For which table(s) of values in Exercises 39–42 is the relationship linear? Tell how you decided. Write the equation for each linear relationship. x 5 10 15 20 25 30 y 20 30 40 50 50 50 I understand this is not linear function but what is it asking me to do next.
April 20, 2010

chemistry
Calculate enthalpy change of reaction for the combustion of gaseous ethanol. C2H5OH + 3O2 >> CO2 + 3H2O. Using standard molar enthalpies of formation. C2H5OH -235.3 ( it's negative sign) CO2 -393.5 H2O -241.8 (1) Calculate the enthalpy change of reaction per mole of ...
April 20, 2010

Chemistry
given the true molar masses of CuSO4 and H2O how could you find the exact formula of the hydraye from your experimental data. Find the Value of X in the Formula CuSO4x XH2O
April 20, 2010

Chmeistry
given the true molar masses of CuSO4 and H2O how could you find the exact formula of the hydraye from your experimental data. Find the Value of X in the Formula CuSO4x XH2O
April 19, 2010

5th grade math
thanks....I haven't even been shown that way to figure it out. Thanks so much!
April 19, 2010

5th grade math
two numbers are reciprocals of each other and one of them is four times as large as the other. what are the two numbers?
April 19, 2010

Math
Try doing it with casework. Case: 1 1,9 x2 2,8 x2 3,7 x2 4,6 x2 2+2+2+2=8. That's it for case one since Diane only has one stamp for each. Case: 2 1,2,7 x6 1,3,6 x6 1,4,5 x6 2,3,5 x6 6+6+6+6=24. Case: 3 1,2,3,4 x24 The total answer is 8+24+24=56.
April 15, 2010

math
use fraction bars to find the quotient 2/9 divided by 1/6
April 15, 2010

math
Solve 2cosx-sin^x +2 =0 for all real values of x
April 15, 2010

chemistry
which of these salts is least soluble in water? 1. LiCl 2. RbCl 3. FeCl2 4. PbCl2
April 14, 2010

7th grade
just roll it and through it away
April 14, 2010

english
In the space provided, write a paragraph of cause and effect. You may use one of the topics below or one of your own choosing. Mention at least three causes and their three effects. friendship as a two-way street television and preschoolers vitamin deficiency in teenagers the ...
April 14, 2010

college
Determine the flux through a circular coil (diameter = 8.2 cm) when the magnetic field is 1.5 T and is oriented at 32.6 degrees with respect to the coil's normal.
April 13, 2010

college
what is the most important element for creating a magnetic field.
April 12, 2010

physics
what is the most important element for creating a magnetic field. and why? Moving charges..... right?
April 11, 2010

Gen Chem
Ok, how about this one? A solution contains ammonium ions and calcium along with some anions, how would you separate the ammonium ions from the calcium??
April 11, 2010

General Chemistry
Thank you DrBob222!!!
April 11, 2010

General Chemistry
if lead nitrate was added to sodium nitrate, how could one get the lead ions out of the sodium nitrate?
April 11, 2010

Chemistry
Hey guys I was wondering if you guys know the answer to this: Which of the following is NOT true of colligative properties? Colligative properties are... A. independent of the chemical identity of the solute. B. responsible for lowering the vapor pressure of a solution versus ...
April 11, 2010

Chemistry
[4 points] In a recent poll, 10 local students were asked how many beers they drink in a typical week. The responses, in no particular order, were: 4, 10, 6, 14, 12, 17, 30, 15, 12, 0 At a 90% confidence level, is there an outlier in the data given above? At a 95% confidence ...
April 7, 2010

Chemistry
2. [4 points] Serum cholesterol levels were monitored to investigate the effect of physical training. Prior to this training, blood samples were acquired from each of the 12 subjects and were tested for cholesterol level. After a week-long training period of daily running, the...
April 7, 2010

Chemistry
[6 points] You need to make a solution of Ca(NO3)2 for a class demonstration. First, you measure a quantity of the solid Ca(NO3)2 by weighing the reagent container before obtaining the sample (4.2540 ± 0.0003 g) and after taking some reagent (3.9440 ± 0.0003 g...
April 7, 2010

English
I'm suppose to identify and label the Subject Compliments, Object Compliments, Direct Objects, and Indirect Objects in each of these sentences. I've got most of them already but I'm having trouble with just a couple. Please Help, 1. Accomplishments have no color. 2...
April 6, 2010

English
I'm suppose to identify and label the Subject Compliments, Object Compliments, Direct Objects, and Indirect Objects in each of these sentences. I've got most of them already but I'm having trouble with just a couple. Please Help, 1. Accomplishments have no color. 2...
April 6, 2010

English
I'm suppose to identify and label the Subject Compliments, Object Compliments, Direct Objects, and Indirect Objects in each of these sentences. I've got most of them already but I'm having trouble with just a couple. Please Help, 1. Accomplishments have no color. 2...
April 6, 2010

Math (fractions)
2 8/9 + 1 1/2 2 16/18 + 1 9/18 52/18 + 27/18 79/18
April 6, 2010

Calculus
You need to use the multiplication rule: y = 2 sinx cosx y' = 2 d/dx (sinx * cosx) y' = 2 [ (sinx * -sinx) + (cosx * cosx) ] y' = 2 [ -sin^2 x + cos^2 x ] y' = 2cos^2 x - 2sin^2 x
April 6, 2010

Math
A company is increasing production at the rate of 25 units per day. The daily demand function is determined by the fact that the price (in dollars) is a linear function of q. At a price of $70, the demand is 0, and 100 items will be demanded at a price of $60. Find the rate of...
April 6, 2010

ALGEBRA
3x + x(x-1)=0 3x + x^2 - x = 0 x^2 + 2x = 0 x (x - 2) = 0 x=0 x=2 There are two answers, x=0 and x=2 To find the y intercepts, set x = 0: y = 3x + x(x-1) y = 3(0) + 0(0-1) y = 0 + 0 y = 0 So the y intercept is at 0
April 6, 2010

math
Trapezoid?
April 6, 2010

math
a^2+k^2=j^2 a^2 = j^2 - k^2 a = square root ( j^2 - k^2 )
April 6, 2010

chemistry
I am using Na2S2O3.5H2O. By large amount i mean about 15 grams
April 3, 2010

chemistry
why is sodium thiosulfate readily soluble in water? how can a large amount of it be dissolved into only 3 ml of water?
April 3, 2010

Calc 2, Series/Sequences
Explain clearly in detail the difference of the summation of n=1 to infinity of 1/n^2; and the integral of 1/x^2dx with the limit of 1 to infinity, as well. Part 2: Explain the natures of the two expressions and explain why the summation is greater than the integral test. The ...
April 1, 2010

To Alex - re Math
thank you
March 31, 2010

Math
To measure the height of a building,two sightings are taken a distance of 50 feet apart. Of the first angle of elevation is 40 degrees and the second is 32 degrees, what is the height of the building?
March 30, 2010

math
A pendulum swings through an angle of 20 degrees each second. If the pendulum is 40 inches long, how far does its tip move each second?
March 30, 2010

math
what happens to the 16 inches and 14 inches.
March 30, 2010

math
The radius of each wheel of a car is 16 inches. At how many revolutions per minute should a spin balancer be set to balance the tires at a speed of 90 miles per hour? What is the setting for a wheel of radius 14 inches?
March 30, 2010

Trig.
The bearing would be 360-17.14= 342.86 due to the fact that the bearing scale is different than the unit circle.
March 30, 2010

Math
In each case, determine whether the situation calls for a discrete or continuous random variables and explain your answer.
March 30, 2010

Math
find each quotient, using long division (5x^4+14x^3+9x) / (x^2+3x+1)
March 24, 2010

4th grade math
got it. i just started mulitplying small numbers(like 3 & 4) by the numerator and denominator of 14/3(cause 14/3 is what you get when you turn mixed numders of 4 2/3 into improper fractions. so i got 42/9 & 56/12. correct?
March 23, 2010

4th grade math
ok but how do you get those?
March 23, 2010

4th grade math
write 3 different improper fractions that equal 4 2/3
March 23, 2010

chemistry
what is an example of autocatalysis? what will the graph of the rate of an autocatalytic reaction versus time look like?
March 23, 2010

physics
A series RLC circuit has a resonant frequency of 6.00 kHz. When it is driven at 8.00 kHz, it has an impedance of 1.00 k(ohm)and a phase constant of 45 degrees. What are the R (resistance), L (inductance), and C (capacitance) of the circuit?
March 18, 2010

Global History
Hitler translated his hatred into a program of genocide. How do ethnic, racial, and religious hatreds weaken society? is the answer because people believe race can create conflicts towards different gropus of race
March 17, 2010

Global History
Last question i promise. Describe Hitler's blitzkrieg tactics.
March 17, 2010

Global History
Why were Western democracies willing to give into Hitler's aggressive actions?
March 17, 2010

Global History
what was Adolf Hitler's goal during the National Socialist movement?
March 17, 2010

5th grade
To cause a commotion that could ruin a plan: rock_ _ _ _ _ _ _
March 15, 2010

probability
consider the experiment of selecting a card from an ordinary deck of 52 playing cards and determine the probability of the stated event. A card that is not a king and not a spade is drawn. I know there are 52 cards in a deck and there are 4 kings to a deck. And 13 spades in a ...
March 15, 2010

college
0 and 5 because 0 can't divide, nor be divided
March 15, 2010

biology
Why is cell culture one of the most valuable technical achievements in the entire study of biology?
March 11, 2010

Math - Calculus
Show that the equation log y = 1.54 - .008x - .658 log x is equivalent to y = 34.7 (1.0186)^(-x) * x^(-.658)
March 10, 2010

science
how long does it take to grow different fruits and vegetables? I need a chart! Please!!!
March 9, 2010

Physics
You raise a bucket of water from the bottom of a deep well. If your power output is 108 W, and the mass of the bucket and the water in it is 7.00 kg, with what speed can you raise the bucket? Ignore the weight of the rope.
March 9, 2010

Physics
Why is the centripetal force subtracted from the force of gravity? Aren't both going in the same direction (since centripetal force is always in the direction of the center of the circle)
March 7, 2010

Chemistry
I have a 1L solution of 0.02M sodium acetate and 0.02M acetic acid. What is the pH after the addition of 0.05 moles of hydrochloric acid? I know this is a buffer question but I have no idea how I am supposed to go about getting the answer... I know Ka values for acetic acid, ...
March 4, 2010

math
i'm supposed to come up with different questions for 11-12 year olds, 13-14 year olds, and 17 year olds. the topic is the triangular number sequence. any ideas for them?
March 4, 2010

science
what is the latin greek word for single PLZ HELP ME!!!
March 3, 2010

spanish
does "fin" have an accent?
March 3, 2010

Physics
Less than
March 2, 2010

Math
So the answer would be y=4x+2? Or would the 4 still be negative.
March 2, 2010

Math
Write a equation if a line through (0,2) that is perpendicular to y=-4x+6
March 2, 2010

Chemistry
.... try : .613g/136.23g/mol=.004999mol .959g/296.04g/mol=.003239mol Divide: .003239/.004999 then *100% = Percent yield =72% yield?
March 2, 2010

Chem
How us the speed of a chemical reaction related to the spontaneity of the reaction?
March 1, 2010

XACC 280 (accounting)
Nathan is a dix head.
February 28, 2010

biology
what will happen to a red blood cell placed in a solution of 99.3% water and 0.7% salt?
February 25, 2010

physics
In a rescue, the 80.0 police officer is suspended by two cables 35 degrees and 48 degrees. Find the tension in both cables?
February 24, 2010

biology
Will O2 passively diffuse and bind with hemoglobin that is less than 1mm from the surface of a blood sample? The percent of hemoglobin bound with O2 is different at high (10% CO2) and low (5% CO2) CO2 concentrations when the Po2 equals 0mmHg. Is that true?
February 24, 2010

biology
3/4
February 23, 2010

Biology
Will O2 passively diffuse and bind with hemoglobin that is less than 1mm from the surface of a blood sample? The percent of hemoglobin bound with O2 is different at high (10% CO2) and low (5% CO2) CO2 concentrations when the Po2 equals 0mmHg. Is that true?
February 23, 2010

physics
An eardrum can burst when the pressure exceeds one atmosphere and the pressure inside the ear fails to equalize. Determine the depth in seawater when this pressure would be reached. (pressure of ocean = 1.03*10^3 kg/m^3)
February 23, 2010

Chemistry 51LA
.... try : .613g/136.23g/mol=.004999mol .959g/296.04g/mol=.003239mol Divide: .003239/.004999 then *100% = Percent yield =72% yield?
February 23, 2010

Physics
When you push a 1.80-kg book resting on a tabletop, it takes 2.05 N to start the book sliding. What is the frictional force exerted on the book when you push on it with a force of 0.80 N?
February 22, 2010

PHYSICS
Consider a disk of radius 10 cm and positive surface charge density +3.7 mC/m2. A particle of charge -4.5 mC and mass 75. mg accelerates under the effects of the electric field caused by the disk, from a point at a perpendicular distance from the center of the disk. The final ...
February 22, 2010

Accounting
What is the effect on income before taxes if the aging category is changed on an accounts receivable by issuing a new invoice to customers with a revised date?
February 19, 2010

Biology
Find a recent (from 2009 June onwards) and interesting article from the mass media with a theme that is related to topics learnt in Cell Biology. So far I've learnt Membrane Structure & function,Organelles and their structure & function, as well as their membrane systems, ...
February 17, 2010

4th grade
i am a two-digit number over 50. when you put me in groups of seven, two are left over. the sum of my digits is 11. what number am i
February 11, 2010

chemistry
how do reciprocating heat engines work?
February 11, 2010

math
what is the domain, range, zeros, Initial value, sign, variation and extrema
February 10, 2010

french
Sportif
February 9, 2010

Finance
a car sells for $25000. if the rate depreciation is 15% what is the value of the car after 7 years
February 9, 2010

Grammar
Also, I'm not sure if the following sentences have run-on errors. "Houdini was born in Budapest, Hungary in 1874 when he was 4 his family immigrated to the United States." "Houdini made his name as an escape artist and magician at the turn of the century he ...
February 8, 2010

Pages: <<Prev | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | Next>>

Search
Members