Wednesday
July 29, 2015

Posts by beth


Total # Posts: 689

chem
Calculate [H3O+] for each of the following solutions. a)pH = 8.59 i got 3.00e-9 but it said it was wrong. what am i doing wrong. im using the equation 10-ph = [H30+]
April 6, 2011

chem
Oh ok, thanks!
April 6, 2011

chem
Calculate the pH of each of the following solutions. (a) [H3O+] = 2.9 10-10 M- I got 9.5 but its wrong. I used the equation pH= -log[H3O+] Is this the wrong equation? (b) [H3O+] = 6.4 10-2 M thanks:)
April 6, 2011

chem
THANKS:)
April 3, 2011

chem
If 0.752 g of pure sodium carbonate was dissolved in water and the solution titrated with 25.90 mL of hydrochloric acid to a methyl orange end point, calculate the molarity of the hydrochloric acid solution. (Hint: This process takes the carbonate ion to carbon dioxide.) Do I ...
April 3, 2011

Calculus
Find the area of the region enclosed by one loop of the curve. r = sin(12θ)
April 3, 2011

hypothesis testing
No
March 26, 2011

algebra
how do I rewrite this 4ã20
March 24, 2011

algebra
divide 3z-18z z-6 10 55z
March 24, 2011

algebra
convert to decimal natation 8.93x10^7
March 24, 2011

Physics=Please check
Thank you for all your explanations-it really helped alot
March 22, 2011

Physics=Please check
I have an electrical circuit which has 20V shown on left side I=0.8A on top I = 0.3A on bottom I have to find the resistance Would I add 0.8 + 0.3 and then use the formula V = IR so it would look like this: 20V = 1.1A x R 20V x 1.1A = R
March 22, 2011

algerbra
how to solve 3a+2[2+3a(a-1)]=2(3a+4)
March 21, 2011

Spanish 7th grade-please check
How doyou ask if a friend if they are hungry? Tienes hambre? If they are thirsty Tienes sed? Both should have upside down question marks before question
March 21, 2011

physics
A rectangular container measuring 24 cm 48 cm 55 cm is filled with water. What is the mass of this volume of water in kilograms?
March 19, 2011

math
Your Porsche's gas mileage (in miles per gallon) is given as a function M(x) of speed x in miles per hour. It is found that M'(x) = 3,600x−2 − 1 (3,600x−1 + x)2 . Estimate M'(10), M'(60), and M'(110). (Round your answers to seven decimal ...
March 9, 2011

calc
Evaluate the given expression. d dx [2(x2 + 3|x|)] 1
March 7, 2011

calc
Calculate dy dx . You need not expand your answer. y = (9x2 + x)(x − x2)
March 7, 2011

calc
Compute the indicated derivative. q(p) = 2.5 p + 3.2; q'(5) 1
March 3, 2011

math
The function gives the cost to manufacture x items. C(x) = 20,000 + 5x − x2 20,000 ; x = 20,000 Find the average cost per unit of manufacturing h more items (i.e., the average rate of change of the total cost) at a production level of x, where x is as indicated and h = ...
March 3, 2011

math
thanks
March 3, 2011

maths
Make k the subject of the following two equations. 1) 8k+2=3(4k+t) 2)7k+11t=5-9kt
February 27, 2011

Discrete Math
f: A→B, g: B→A Is g ° f defined? If so, what is its domain and range?
February 16, 2011

Maths
Y is directly proportional to x If y= 10 when x=-5 what is the value of y when x =30. The answer should be a number.
February 9, 2011

chemistry
Calculate the mass for: A gold sample that absorbs 225 J to change its temperature form 15 degrees celsius to 47 degrees celsius.
January 31, 2011

maths
Suppose that y is directly proportional to x. If y = 10 when x = −5, what is the value of y when x = 30?
January 25, 2011

math
1 2 4 42 1882
January 24, 2011

Ogle
A string is cut in half, and one of the halves is used to bundle newspapers. Then one fifth of the remaining string is cut off. The piece left is 8 feet long. how long was the string originally.
January 12, 2011

chemistry
if you react magnesium solution and lead powder together is there a temperature change?
January 9, 2011

algebra
y>=1 x>=5
January 5, 2011

algebra
(0,4),(-1,-3)
January 5, 2011

algebra
8x-(6x+7)=3 x =
January 5, 2011

algebra
5/4x+1/8x=5/8+x
January 5, 2011

algebra
3r-5s=-14 3r+3s-56
January 5, 2011

maths
Use a factor tree to write 1575 as a product of prime factors. You should display your factor tree in your answer.
December 19, 2010

Maths
Solve the equation 2x-5=7-6x Enter your answer as a fraction in its lowest terms in the box below using / for division. For example, enter as 5/2.
December 18, 2010

com 155 week 6 help
Students are often confused about the use of the words good and well in their writing. Write a 100-word passage to Scott McLean, the author of the course’s textbook, in which you describe five details from her book that are good and five details about the book that are ...
December 12, 2010

physics
Consider a level flight turn of a propeller-driven airplane in which the airplane makes a complete circular turn in 1.6 min. If the plane's speed is 180 m/s, what is the radius of the circle? 1 m What is the centripetal acceleration of the plane? 2 m/s2
December 8, 2010

Chemistry-Help!!!
How many grams of chloride ions are in 2.5L of a 1.0 M calcium chloride solution?
December 7, 2010

math
Multiply and then simply by factoring (√2y)(√3)(√8y)
December 5, 2010

Chemistry-Emergency
What is the molarity of a 15% solution of Ni3Fe(CN)6?
November 30, 2010

Chemistry-confused
I have not idea how to work this problem without the grams or the ML of the solution!
November 30, 2010

Chemistry-confused
No, I'm having trouble figuring the molecular weight of it so I can then figure the molarity.
November 30, 2010

Chemistry-confused
What is the molarity of a 15%(w/v) solution of nickel (III) ferrocyanide? I can't figure out what nickel(III) ferrocynade is?
November 30, 2010

Chemistry-urgent!
Thanks!I get it now. Getting 250 mL just confused me because it was more than I started with, but that's what I want, just in a weaker concentration, right?
November 30, 2010

Chemistry
An aqueous mixture containing starch, NaCl, glucose and albumin is placed in a dialyzing bag and immersed in distilled water. Which of the following, correctly describes the location of the indicated substance after dialysis? A. albumin, inside B. starch outside C. albumin ...
November 29, 2010

physics
if the static coefficient of friction in the ice rink between the floor and the skater's shoes is .2, how much pushing force can he supply before his boots will begin to slide?(the skater's mass is 120kg)
November 28, 2010

chemistry
Ammonia gas and carbon dioxide gas react to form aqueous urea (NH2CoNH2) and water. What volume of ammonia at 25 degrees celcius and 1.5 atm pressure is needed to produce 500 g of urea?
November 24, 2010

history
Assess the presidency of Thomas Jefferson. Do his actions in office coincide with his political philosophy?
November 23, 2010

Physics
first part, use a=rw.. so a=9.8(.227)
November 18, 2010

chemistry
The following system is at equilibrium with [N2O4] = 0.55 M and [NO2] = 0.25 M. If an additional 0.10 M NO2 is added to the reaction mixture with no change in volume, what will be the new equilibrium concentration of N2O4? N2O4(g) 2 NO2(g)
November 15, 2010

physics
A block of mass 12.0 kg slides from rest down a frictionless 35.0° incline and is stopped by a strong spring with k = 1.50 104 N/m. The block slides 3.00 m from the point of release to the point where it comes to rest against the spring. When the block comes to rest, how ...
November 12, 2010

Chemistry
Does the aufbau principle apply to radioactive isotopes?
November 11, 2010

Chemistry
Would the molecular ratio of the equation 4Na + O2 = 2Na2O be 4:2?
November 11, 2010

Chemistry
What is the molecular ratio of the following equation? HNO3 + KOH = H2O + KNO3
November 11, 2010

Chemistry
What is the molecular ratio in the following equation:H2O + SO3 = H2SO4
November 11, 2010

6th grade
Hey how do you turn 5/8 into a decimal??
November 8, 2010

AP Chem
The energy change H associated with the reaction NBr3(g) + 3H2O(g) -> 3HOBr(g) + NH3(g) is +81 kJ/mol rxn. These bond energy values might be useful: O-H 459 kJ/mol; N-H 386 kJ/mol; O-Br 201 kJ/mol. The strength of the N Br bond is 1. 4 kJ/mol 2. 465 kJ/mol 3. 66 kJ/mol ...
November 7, 2010

AP Chem
Consider the reaction 2 Al2O3(s) -> 4 Al(s) + 3 O2(g) . H = +3339.6 kJ/mol What is the change in heat when 0.455 L of a 3.60 M Al solution reacts with excess O2 ? 1. -685 kJ 2. -21,962 kJ 3. -1368 kJ 4. -2738 kJ 5. -5477 kJ 6. -26,521 kJ 7. -424 kJ 8. -1695 kJ
November 7, 2010

AP Chem
A student conducts an experiments to determine the enthalpy of neutralization for phosphoric acid reacting with sodium hydroxide. The student combines 25.0 mL of equimolar solutions of acid and base, both having an initial temperature of 22.5 degree C, in an open polystrene ...
November 6, 2010

social studies
Does technology make it more or less likely that the U.S. will return to it's old policy of not taking part in world affairs?
October 28, 2010

social studies
why is the Northeast coast so crowded with cities?
October 24, 2010

8th grade
What is the meaning of seperation of powers
October 14, 2010

calculus
the graph of f(x) passes through the point (0,6). the slope of f at any point P is 2 times the y-coordinate of P. find f(1)
October 14, 2010

Math
-243/20 there is nothing more simple than that unless it's a decimal
October 14, 2010

Math
not sure about the question but maybe 9990 1 and 9990 5 and 1998 10 and 999 sorry if this was the wrong idea
October 14, 2010

Chem
If 20.0g acetylene is allowed to completeyl react with o@ how many g of O2 are reacted? 2C2H2 +5O2----4CO2 +2H20
October 13, 2010

Physics
How did you get that?
October 7, 2010

Chemistry
The Ksp of aluminum hydroxide is 5 x 10 -33.At what ph foes Al(OH)3 just begin to precipitate in a 0.15M solution of AlCl3?
October 7, 2010

math
how do i convert 0.79 to a fraction
September 22, 2010

Physics
Show that the pressure P of a gas can be written as: P= 1/3* p* v^2
September 21, 2010

6th grade social studies
need to find a place that has no culture so I can write an essay about it
September 12, 2010

General Chemistry
Given 115 grams of Na2SO4 find: a. the # of moles in sodium sulfate b. the # of moles in sodium ions Please explain all work and fully explain where each # came from. Thanks.
August 24, 2010

elementary math
What is half of one and a half cups?
August 16, 2010

history
what were the political and social outcomes of the end of the Vietnam War?
August 12, 2010

medicine
What is the main difference between a stem cell and a cancer cell? A. A stem cell grows at a faster rate than a cancer cell B. A stem cell obeys signals to stop growth, but a cancer cell doesn't C. A stem cell is usually external; a cancer cell is usually internal D. A ...
August 7, 2010

medicine
A patient was admitted in an alternating state of mania and despair. What diagnosis does this statement describe? A. Obsessive-compulsive disorder B. Bipolar disorder C. Posttraumatic stress disorder D. Anxiety I'm not sure if it's B or D
August 7, 2010

medicine
A patient has unrealistic thoughts and behaviors despite an awareness that they're inappropriate. She's experiencing A. Phobia B. paraphilia C. panic attack D. obsessive-compulsive disorder I think it's D
August 7, 2010

Chemistry
Ah, I see what you are talking about. OCH3 is above the CH ________________________ OH O is above the CH Also OH is under the CH ________________________ OH is under the C ___________________ CH3 O is above the CH ____________________ Br is above the C OH is under the C ...
July 26, 2010

Chemistry
I would appeciate any help with identifying the chiral carbons, if any, in each of the following compounds: OCH3 2. CH3--CH--CH3 OH O 11. CH3--CH--C--CH3 OH 12. CH3--C--CH3 OH CH3 O 15.CH3--CH--C--CH3 Br CH3--C--CH2--CH3 OH thank you.
July 26, 2010

Chemistry
yes, it is tetrahydrocannabinol. I had put because OH is acidic it would be an example of an aromatic alcohol.slightly acidic. also phenol and carbonic acid. Thank you for letting me know it is only an ether and a phenol.
July 26, 2010

Chemistry
I have a lot of questions on identify(ing) the functional groups in molecules. I am not sure how to go about finding these out.The first question is THC. How do I go about knowing the functional group of this molecule? Thank you.
July 26, 2010

Chemistry
Does anyone know the condensed structured formula in the following reaction: a.CH3--CH2--CH=CH2+HOH-->H+ Thank you.
July 26, 2010

Chemistry
Thank you. On the second one I forgot to put an O--CH3 over the CH O--CH3 CH3--CH2--CH--CH2--CH3 ___________________ Does anyone know the functional group of the following? Thank you. OH CH3 CH3--C--CH2--CH--CH3 CH3
July 26, 2010

Chemistry
Are these an alcohol, phenol, an ether or a thiol. CH3--CH2--CH2--SH CH3--CH2--CH--CH2--CH3 Any help is appreciated, I am trying to get the hang of this.If I know these two, I believe I will be able to do all the other ones I have to. Thanks.
July 26, 2010

Chemistry
I do not have any table of functional groups. I am out of the city w/o a textbook visiting an ill parent. I will look online. I think I have it though regarding functional group. Any OH-C bond is an alcohol. O would be ether due to C-0-C bond. C-SH bond would be thiol. But I ...
July 26, 2010

Chemistry
Ok, it looks good then? Thank you for looking it over. Do you know where I would be able to recieve online assistance with drawing structures? Thank you.
July 26, 2010

Chemistry
Draw the condensed structural formula for ethylbenzene, 1,3 dichlorobenzene,1,2 and 4-trimethylbenzene ? Any help would be appreciated, thank you I also was wondering if anyone could let me know if I am going in the correct direction with this question> Acetylene gas reacts...
July 26, 2010

chemistry
Using a value of Ksp = 1.8 x 10-2 for the reaction PbCl2(s) = Pb+2(aq) + 2Cl-(aq). If a solution has a current value of Keq of 1.2 x 10-2, which statement is true?
June 21, 2010

algebra
The answer is D. The sqrt of 16 is 4. The sqrt of 4 is 2.And just keep the sqrt of (2) the same.(:
June 21, 2010

math
64.93 You do pythagorean theorem. a2+b2=c2
June 21, 2010

Algebra
I need to make an algebra problem using a cake with the measurements 12 inches by 16 inches and 3 inches thick. There were also 30 guest there and half of the cake was left. I also need the concept being used.
May 10, 2010

Algebra
I need to make an algebra problem using a cake with the measurements 12 inches by 16 inches and 3 inches thick. There were also 30 guest there and half of the cake was left. I also need the concept being used.
May 10, 2010

chemistry
I don't understand how we can know the total moles of solution if the question doesn't specify what the aqueous solution is. Do we always assume its water??
May 2, 2010

grammar
The role of education plays a big part in financial planning. The role of education also helps you in learning basic math skills in order to better your finances. The whole idea is to help you in becoming a more responsible adult. With effective resource planning organizations...
April 28, 2010

college
FIND THE VERTEX THE LINE OF SYMMETRY THE MAX OR MIN VALUE OF THE FOLLOWING F(X)= -X^2+10X+5
April 25, 2010

chemistry
15.0g of each reactant is taken,determine which mass is limiting and calculate the mass of each product: Al(s)+HCl(aq)-->AlCl3(aq)+H2(g)
March 29, 2010

Conflict Management
Name at least 3 Passive aggressive groups and behaviors in society I was thinking the KKK, Civil Rights Movement, and disgruntled workers in the workplace. Any other thoughts would be greatly appreciated! Thanks :)
February 21, 2010

Reproduction
What would the biological effect of severing the portal blood vessels in the stalk of a pituitary gland? Would the release of hormones by the posterior pituitary gland be affected by severing the portal blood vessels?
February 13, 2010

Chemistry
Please heellppppppppp!!!! How do you expect the following series of compounds to compare in behavior in the two tests?(Sn1/Sn2 reaction) CH3-CH=CH-CH2-Br CH3-C=CH-CH3 ! Br CH3-CH2-CH2-CH2-Br Please help me answer this question, I really don't understand and don't know ...
February 9, 2010

  1. Pages:
  2. <<Prev
  3. 1
  4. 2
  5. 3
  6. 4
  7. 5
  8. 6
  9. 7
  10. Next>>

Members