Friday
October 24, 2014

Posts by Lisa


Total # Posts: 3,017

chemistry HELP!
Solve an equilibrium problem (using an ICE table) to calculate the pH of each solution: a solution that is 0.170 M in HC2H3O2 and 0.105 M in KC2H3O2
December 15, 2010

chemistry
Predict qualitatively whether the salts below dissolve to give solutions that are acidic, basic or neutral. what is the rule for figuring this out? a. KNO2 - basic b. Ng(NO3)2 - neutral c. NH4ClO2 - acidic d. NaHCO3 - basic
December 15, 2010

Chemistry
Calculate the pH of a solution at the endpoint of a titration involving 25.00 mL of CH3COOH at unknown concentration, and 21.40 mL of 0.100 M NaOH
December 15, 2010

Chemistry!
1. not sure where to find Kb as listed as 1.8E^-5? so is it 1.8E^-5= (NH4+)(NH3)/0.1-X (9.25)(4.75)/0.1-X = 439.375-X and how to I convert this to pOH and then to pH?
December 15, 2010

Chemistry!!
So is Ka water H2o? not sure where you got 7.20 in my chart 7.2 goes with H2PO4^- there is nothing for (H3O+) but I got 4.69 for CN- and 9.31 for HCN I am so lost...
December 15, 2010

Chemistry
Can the 5% approximation be used to determine the pH of the following solutions? How do I do this question? (A) 0.56 M hypochlorous acid - yes (B) 3.00 M nitrous acid - yes (C) 0.010 formic acid - no
December 15, 2010

CHEMISTRY TITRATION Q
because at end point the solution is neutral, so the # of moles are the same? No ...so what do I do differently??
December 15, 2010

CHEMISTRY TITRATION Q
The titration of 25.00mL of Ba(OH)2 solution with an aqueous solution of 0.500 M HCl reaches an end point when 30.20 mL of the HCl solution is added. Determine the concentration of M of the Ba(OH)2 solution. Soo 25.00mL=0.025L 30.20mL= 0.0302L moles= MxL (0.500M)(0.0302L)=0....
December 15, 2010

math
find the value of both percentages out of 100 and then add them together along with the $6.80
December 15, 2010

college maths
i was thinking abot 154.7 bt was not so sre and i did know it had to be less bt i didnt want to assme i wanted to know how i came up with the answer
December 15, 2010

college maths
One and one-half cups of native blueberries have 232 calories. How many calories does one cup of native blueberries have? (Points: 5) 233.5 calories per cup 232 calories per cup 154.7 calories per cup 0.006 Calories per cup Not sre how to calclate this one can i get some help ...
December 15, 2010

Science
I'm confused..What is the significance of a 1-1 line in regards to density?
December 14, 2010

college maths
81/800
December 14, 2010

college maths
some help wold really be appreciated please?
December 14, 2010

college maths
Write as a reduced fraction. 10 1/8% not sre how to work this one please help. 4/5 81/100 1/10 81/800
December 14, 2010

english/grammer/manners
Do you think us students should have to use yes or yes ma'am when answering teachers/ What do ya'pp prefer? And if so is there a comma between the words yes and ma'am/
December 14, 2010

math
which set is infinite? P = {positive numbers less than 60} Q = {whole numbers between 10 and 20} R = {intergers ge=reater than 18} S = {even numbers between 5 and 15}
December 13, 2010

college maths
subtract. 10 3/5-2 10/11= 8 38/55 7 743/55 7 38/55 Is D correct??
December 13, 2010

college maths
Simplify 5+1/3 1/3 1/3 {1/9+1/9} 4 1787/2187 4 1792/2187 4 1784/2187 4 22/27 Is D the best choice not sre for this one
December 13, 2010

college maths
wooooohooooooooo!!!!! thanks so mch
December 13, 2010

college maths
Translate and solve. A number n increased by 1/4 gives 1/9. Find n. (Points: 5) n=1/9 n= -5/36 n=1/36 n=1/18 is it B
December 13, 2010

college maths
thanks very much i now have a better understanding
December 13, 2010

college maths
Find the LCD and add the fractions. 1/125 + 4/50= 11/24 1/1250 1/35 551/6250 (Points: 5) im not getting the concept of this some help is really needed please
December 13, 2010

chemistry
10.2 g of Pb(NO3)2 are dissolved in 100 mL of water, and added to 250.0 mL of a 0.250 M solution of KI. Determine the mass in grams of Pbl2 produced, and find the number of moles of the excess reagent. PLZ explain
December 13, 2010

chemistry
Determine the molarity of nitrate ions in a solution prepared by mixing 25.0 mL of 0.50 M Fe(NO3)3 and 35.0 mL of 1.00 M Mg(NO3)2 Please explain fully do not know where to start?
December 13, 2010

college maths
??? any help
December 13, 2010

college maths
Ann and Grace mow the yard for $38 each mowing. During one summer they mowed 2 times and spent a total of $10 on gas. The girls split their earnings. How much did each girl receive? (Points: 5) $33 $38 $66 $76 this one is confusing its either C or D bt depends....Are they ...
December 13, 2010

college maths
no help??
December 13, 2010

college maths
its not allowing me to pt the square roots in......its someting like this 10X3X5 square root respectively 0, 3, 2
December 13, 2010

college maths
Write as a product of factors; then find the product. (Points: 5) 0 90 675 150 I think the answer is C but im confuse any other opinions please?
December 13, 2010

math
i dont know
December 8, 2010

math
A diameter of a circle is perpendicular to a chord whose length is 12 inches. If the length of the shorter segment of the diameter is 4 inches, what is the length of the longer segment of the diameter?
December 8, 2010

math 104
if a bussiness borrows $20,000 and repays $29,5000 in 5 years ,what is the simple interest rate?
December 6, 2010

Math
Fill in the blank so that the given statement is true. The median is 77 65,68,78,82,89,__
December 5, 2010

Math
Fill in the blank so that the given statement is true. The median is 77 65,68,78,82,89,__
December 5, 2010

Math
So false?
December 5, 2010

Math
A rectangular flowerpot is 20 inches long 8 inches wide and 6 inches high. true or false if andy fills the flowerpot 2/3 fullof potting soil the expression 2/3(20 + 8 + 6) could be used to find the amount of potting soil he needed
December 5, 2010

Exponents
GRE question - What is greater z or 60? z is the degrees of a one of the congruent sidesAn isoceles triangle
December 5, 2010

Business Communications
The interviewer wants to know why you got a "D" in all your English classes until this year, when you got a "B." Your best response is: (Points: 5) “I had problems writing and never thought it was important. Then, I realized that it is important, so I ...
December 4, 2010

Business Communications
Choose the best revision of this sentence: "I want an interview with you." (Points: 5) I anxiously await a phone call from you so that we can meet to discuss job opportunities. I can't wait to hear from you. Any time at all that you want to call and have me for ...
December 4, 2010

Business Communications
thank you sooo much
December 4, 2010

Business Communications
Which of the following is the BEST advice for increasing the number of "hits" on a scannable résumé? (Points: 5) Avoid jargon of any sort. Use a Keywords section under your name, address, and phone. Use more verbs than nouns. Use only one page. I think ...
December 4, 2010

geology
if the air temperature @ sea level were 23 C what would the air temperature be at a height of 2 km under avg conditions?
December 4, 2010

Business Communications
thank you very much really appreciate it this forum is a big help to me
December 3, 2010

Business Communications
Unsuccessful groups are more likely than successful groups to: (Points: 5) pay close attention to how something is said. rationalize criticism. deal directly with conflicts that emerge. make important decisions together. im not understanding this question...bt i suppose B is ...
December 3, 2010

Business Communications
In response to a compliment on his excellent oral presentation, a Japanese business executive replies, "No, it wasn't very good." Which of the following is the MOST likely explanation for this response? (Points: 5) He thought the person giving the compliment was ...
December 3, 2010

Math209
I am not understanding how to factor polynomials. Example: Factor 12y^6-40y^5+28y^4
December 3, 2010

Chemistry
2. Which bond is polar covalent? a) H2 b) Cl2 c) HCl d) O2
December 2, 2010

MATH
HOW MANY DIFFERENT WAYS COULD THE FOOTBALL TEAM SCORE 11 POINTS
December 2, 2010

Macro economics
if your agency hire a consultant to develop new software programs to lease at a constant cost of $ 1000 per year. the consultant say you can save $ 200 per year for every computer you purchase but you will be charged $ 100 for each harddrive you purchase . how many programs ...
December 2, 2010

physics
For B, the magnitude is simply the absolute value of what you got in part A.
November 30, 2010

chemistry
In propanol, cholesterol is 2.7 times more soluble at 43°C than at 20°C. If a saturated propanol solution is prepared at 43°C , what proportion of the cholesterol will crystallize upon cooling to 20°C?
November 30, 2010

math
how do i solve 8 times 493 using distributive property. then draw an array showing work
November 30, 2010

8th grade
Tom had scores of 78, 88, 94 and 79 on his first four science tests. What must he score on the next test to have an average of 88?
November 29, 2010

economic
Does diminishing marginal utility or indifference curve works for consumers? which of these concept works
November 29, 2010

Chemistry
write the formula for the following chemical compounds 1.Sodium sulfide 2.sulfur hexaflouride 3.Ammonium sulfate
November 28, 2010

College Algebra
Compounded semiannually. P dollars is invested at annual interest rate r for 1 year. If the interest is compounded semiannually, then the polynomial P(1+r/2)^2 represents the value of the investment after 1 year. Rewrite this expression without parentheses. Evaluate the ...
November 26, 2010

Statistics
The X2 goodness of fit can be used for both qualitative and quantitative data Is this true or false?
November 22, 2010

vocabulary skills
The correct answer is number 4. 100% sure that is correct answer.
November 22, 2010

physics
a football is kicked 40 meters. if the ball is in the air for four seconds what is the intial speed it was kicked
November 22, 2010

physics
a 1 kg dart moving horizntally at 10 m/s sticks to a wood block of mass 9 kg which slides across a friction free level surface. what is the speed of the block and dart after collision?
November 22, 2010

probability
1. A large video rental chain recently decided to change its rental policy, allowing an unlimited return date instead of requiring that movies be returned the next day. The marketing team reasoned that this would greatly increase the popularity of their stores, and also that ...
November 22, 2010

physics
At what temperature do the molecules of nitrogen gas have an rms speed of 34 m/s? 34 m/s is a typical highway speed for a car.
November 22, 2010

math
Robert Mason's account of $98.50 has been delinquent for three months. According to the office procedures manual, after 90 days a 2% service charge, compounded monthly, is added to future bills. What will be the amount owed after nine months?
November 22, 2010

Medical Assisting
Steri-strips cost $4.95 per box, there are 100 per box. If an orthopedic surgical group uses 200 Steri-strips a month, how much would be saved in a year by making a single purchase for a year's supply rather that 12 monthly purchases.If large lots of 1,000 or more, the ...
November 22, 2010

Business Communications
Im not sre of the answer
November 22, 2010

Business Communications
Which of the following would be an example of an emotional appeal that is part of a persuasive message? (Points: 5) "All of the ingredients we use are home-grown in the United States." "We can save 20% in labor costs if we relocate our plant to the Midwest."...
November 22, 2010

Business Communications
Which of the following is NOT a question you need to answer to choose a persuasive strategy? (Points: 5) What do you want readers to do? What points will the audience agree with? How strong a case can you make? What kind of persuasion does your organization value? IM CONFSE I ...
November 22, 2010

Business Communications
What is the BEST reason to omit the reason for the refusal in a negative message? (Points: 5) The reader may not think of the reason. The reason reflects poorly on the company. The reason benefits the reader, but not the writer. The reason is watertight. im not so sre of the ...
November 22, 2010

chemistry
i think I am not doing this part right (1/n5^2 - 1/n1^2)
November 21, 2010

math
donna runs 7 miles in 75 minutes. At the same rat, how many miles would she run in 45 minutes?
November 21, 2010

chemistry
i think I am not doing this part right (1/n5^2 - 1/n1^2)
November 21, 2010

chemistry
I think I am doing something wrong. I keep coming up with 8.72x10^17 and it is telling me I am wrong. I know D E=2.18x10^-18 x (1/1^2-1/5^2)
November 21, 2010

chemistry
calculate the energy of a photon emitted when an electron in a hydrogen atom undergoes a transition from n=5 to n=1 how do I do this?
November 21, 2010

chemistry
If 4.0 L of a 4.9 M SrCl2 solution is diluted to 40 L, what is the molarity of the diluted solution?
November 20, 2010

chemistry
A chemist wants to make 5.5 L of a 0.250 M CaCl2 solution, what mass of CaCl2 (in g) should the chemist use?
November 20, 2010

College Chem
How many mL of concentrated ammonia (14M) should be diluted to 250 mL to make a 0.75 M NH3 solution?
November 19, 2010

physics
Suppose I have a spring. I add a mass (m = 1.0 kg) and it is displaced by 15 cm. What is the spring constant k in units of (N/m)?
November 19, 2010

Chemistry
Explain, in terms of subatomic particles, the difference between S-32 and S-34
November 18, 2010

Physics
I have a spring on a horizontal frictionless surface. Initially it is un-stretched and at x = 0 cm. I then pull it back 10 cm and release it. What is the amplitude of the oscillations (the object has mass m)?
November 18, 2010

Organic Chemistry
why wash the organic layer with distilled water?
November 17, 2010

Statistics
Assume the body temperature of healthy adults are normally distributed with a mean of 98.2 degrees F and a standard deviation of .62 degrees F. If you have a temperature of 99.0 what is your percentile score?
November 16, 2010

Chemistry
Explain, in terms of subatomic particles, the difference between S-32 and S-34
November 15, 2010

english
Okay this is my Thesis:The Internet is better in terms of providing access journals, special collections and it is quicker when searching informations than Library.While in library resources can't be checked our or be available. Is my thesis good? And the four examples I ...
November 14, 2010

english
I have to wrtie a paragraph in which I make claim, state thesis, can not use "For instance or for example and support with 4 examples.I choose this prompt "The internet is a much better resource for students than a library" Please tell me how to start this ...
November 14, 2010

geology
what is the primary basis for differentiating the eras?
November 14, 2010

2 biology terms
Morphology refers to the structure of something : land masses, body parts, shells, etc. Anatomical refers to anatomy which is the structure of a body (be it human or otherwise). So morphology is a more general term. You could say that anatomy is the study of the morphology of ...
November 13, 2010

Physics
With the energy needed to warm up some amount of water from 40C to 64C, how high could you lift it?
November 12, 2010

college
A dog bites a large chunk of flesh from a man's leg. The large, open wound will likely heal by the process of?
November 12, 2010

Math
I have two different questions. what is the set built notation of -11x-24<27-10x and write the slope intercept equation for the line with slope -5/6 and y intercept (0,4)
November 10, 2010

Math
Write the slope intercept equation for the line that passes through (14,-2) and is perpendicular to 7x-10y=18
November 10, 2010

College Chemistry
I DO NOT understand the following! Please HELP :) 1st Part Substances A, B, and C can all act as oxidizing agents. In solution, A is green, B is yellow, and C is red. In the reactions in which they participate, they are reduced to A-, B-, and C- ions, all of which are ...
November 10, 2010

College Chemistry
Substances A, B, and C can all act as oxidizing agents. In solution, A is green, B is yellow, and C is red. In the reactions in which they participate, they are reduced to A-, B-, and C- ions, all of which are colorless. When a solution of C is mixed with one containing A- ...
November 10, 2010

Physics
change in pressure=density*length*gravity
November 10, 2010

anatomy and physiology
When you swallow a peanut, the peanut first comes in contact with the?
November 10, 2010

anatomy and physiology
what cellular process involves mitosis?
November 10, 2010

teacher aide
still need help..
November 10, 2010

Chemistry
What mass of H2O is required to form 1.2 L of O2 at a temperature of 310 K and a pressure of 0.950 atm? 2H2O (l) ---> 2H (g) + O2 (g)
November 9, 2010

math
What is the time to double when the initial investment is $1000 and the annual rate is 3.5%
November 9, 2010

Chemistry
A gas mixture with a total pressure of 750 mmHg contains each of the following gases at the indicated partial pressures: , 265 mmHg; Ar 134 mmHg; and ,O2 157 mmHg; The mixture also contains helium gas.
November 9, 2010

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