Sunday

November 29, 2015
Total # Posts: 3,222

**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*

**Chemistry**

A weather balloon is inflated to a volume of 29.6 L at a pressure of 734 mmHg and a temperature of 27.0 C. The balloon rises in the atmosphere to an altitude, where the pressure is 360 mmHg and the temperature is -13.6 C.
*November 8, 2010*