Posts by Christine

Total # Posts: 556

Chemistry
student perform 2 melting point determinations on a crystalline product. In one determination, the tube contained a sample 1 - 2 mm in height, and the melting point was 141 - 142 ¢ªC. In the second determination, the sample hight was 4 - 5 mm and the melting range ...

Chemistry
Student in O-Chem Lab conducts a melting point experiment with an unknown compound and observes a melting range of 210 – 218C. Is this a typical range for a melting point? If not, what range would be typical? For this question, does it mean an unknown compound in general...

O-Chem
Yea my prof was not very clear or did not clarify what hot water would be. Thanks for the help.

O-Chem
Then the minimum volume of hot water then is 2.70mL

O-Chem
Find the minimum volume of hot water needed to dissolve 100 mg of salicylic acid. Can someone help me how to start this out? I would greatly appreciate it. The data is [temp] [amount of salicylic acid per 100 ml water, g] 0 0.10 10 0.13 25 0.23 50 0.63 75 1.8 90 3.7

integration
please help emergency. find double integral of x times y time e to the <x plus y> . bounded from <0,1> x <0,1>

Math
Can someone please check my answers below for accurateness? The instructions are: Differentiate and simplify. 1) y=(2x^2+3x-1)(3x^2-5x-3) y'=(4x+3)(3x^2-5x-3)+(2x^2+3x-1)(6x-5) 2) y=(5x^2+3x-1)(3x^2-5x-3) y'=(10x+3)(4x^2-3)+(5x^2+3x-1)(8x) 3)y=6x^3-7x^2+5x-7+x^(5/3)-7...

Math
a) determine the equation of the line that is perpendicular to the tangent to y=5x^2 at (1,5). b) determine the equation of the line that passes through (2,2) and is parallel to the line tangent to y=-3x^3-2x at (-1,5).

Health
AIDS/HIV funding and Research

English
his melancholy state of mind or his melancholy state-of-mind

English

English
loved-one or loved one

English
so age-group or no ?

English
Occur age group after age group and repeat time after time Should there by any dashes or hyphens here? should it be like: occur age-group after age-group and repeat time-after-time ???

algebra 2
x-1/x^2-x-20 Give the equivalent numerator if the denominator is (x - 5)(x + 4)(x + 3).

Math
A) A rectangle has perimeter 64 cm and area 23 cm^2. Solve the following system of equations to find the rectangle's dimensions. length=23/width length + width = 32 B) Solve the system of equations x^2+y^2=1 xy=0.5

Math
The dimensions of a gift box are consecutive positive integers such that the height is the least integer and the length is the greatest integer. If the height is increased by 1 cm, the width is increased by 2 cm, and the length is increased by 3 cm, then a larger box is ...

Math
I just have a quick question regarding this question: Simplify. State any restrictions on the variables. log(x^2+7x+12)-log(x^2-9) my answer is log[(x+4)/(x-3)] which is correct. However, for the restrictions, I believe that they are: x>3 and x<-4.. But the back of the ...

pre-calc
How bright a star appears can depend on how much light the star actually emits and how far away it is. The stellar magnitude scale can be adjusted to account for distance as follows: m_2 - m_1 = log (b_1/b_2) Here, M refers to a star's absolute magnitude, that is, how ...

The path around a square flower bed is 3 feet wide. If the area of the flower bed is equal to the area of the path, find the dimensions of the flower bed.

government
in a political party, what is the job of precinct captain?

government
the trying of impeachments is done by who?

government
who solves the disputes over issues in congress? the correspondence committe, the committee of conference, or the core committee.

Science
What are ten scientific facts found in Jurassic park? Include page numbers for reference.

what are the consequences if payroll information is not entered precisely?

uite rate
unit rate of 250 miles in 4hrs

s.s
Did the Constitution resolve the weaknesses in the Articles of Confederation?

s.s
What was the debate between North and South over counting slave populations?

college chemistry
How much heat is needed to melt 50.0g of ice at 0 degree celcius and then heat the water to 25 degree celcius?

physics!
vf2=v02+2ax then solve for vf the vf would then be used as v0 for the 2nd half of the projectile. then you use the same equation to solve for vf.

algebra, equations
y=mx+b slope is m y intercept is b so in this problem the slope is -2/3 the y intercept is -12

phys
A long distance swimmer is able to swim through still water at 4km/hr. She wishes to swim from Port Angeles, WA due north to Victoria, B.C., a distance of 50km. An ocean current flows through the Strait of Juan de Fuca from west to east at 3km/hr. In what direction should she ...

Federal court system
The role of the federal court system is to?

world history
I am a 10th grader and I need to know how to write an essay for world history. I don't get it. Could you email me a sample essay so that I know where things go, such as conclusion, etc.

chemistry
How much heat in kilojoules is required to warm 10.0 of ice, initially at -10.0, to steam at 120. The heat capacity of ice is 2.09 and that of steam is 1.84 .

Ethnic Diversity
I'm very confused with this question and check point•According to current (within the past two years) research and news reports, what are some of the changes the United States has made to policies concerning the treatment of Muslim and Arabic members of society?

Ethnic Diversity
I'm very confused with this question and check point

Why isnt an ant suture not a good idea?

Statistics
Does the null hypothesis for a nondirectional alternative hypothesis differ from the null hypothesis for a directional alternative hypothesis? Explain. I have no idea how to state the answer for this.

Nursing education
I disagree with you bob, many Master's prepared nurses make less money than those who have ADN's. Since I am an ADN nurse who is now one class short of a BSN, I think I know who makes the most money. If you are a hospital nurse with good differentials and base pay ...

Stats
Thanks, I think that is very good. I will add that to my answer.

Stats
Why is it important to know the possible errors we might make when rejecting or failing to reject the null hypothesis?

health care
A doctor needs to sit down, ask open ended questions (not ones that can be answered with a yes or a no) spend enough time with the patient to allow him/her to ask questions and often times it is best to have the patient repeat back the instructions so as to assess the ...

how to write a check
No need to write the word "dollars" as it is usually on the check already.

chemistry homework
In the preparation of sulfuric acid, sulfur dioxide must be catalytically oxidized to sulfur trioxide. How much oxygen must be available to convert 50.0 L of sulfur dioxide according to this process?

Statistics
A student is taking a multiple-choice exam with 16 questions. Each question has five alternatives. If the student guesses on 12 of the questions, what is the probability she will guess at least 8 correct? Assume all of the alternatives are equally likely for each question on ...

general question
Ok this is probably a stupid question but a hospital pharmacist works at a hospital right?

HIPPA
To answer why, it is used to protect consumers from others obtaining information that is not for public information.

I thought I was understanding this but I am really not sure about the symbols. Does the 3*(13/20)^2*(7/20) translate to 3 times 13/20 times 2 times 7/20? Sorry I am not up on the symbols... I will keep trying.

statistics
That is even more confusing. I am totally lost on this problem. I know that I have to multiply the three possibilities, so (7/20)(7/20)(13/20) three times (same numbers, different order) and I get 0.07963. I thought I would add those three numbers or essentially multiply that ...

statistics
I thought I was understanding this but I am really not sure about the symbols. Does the 3*(13/20)^2*(7/20) translate to 3 times 13/20 times 2 times 7/20? Sorry I am not up on the symbols... I will keep trying.

statistics
you have 8 blue marbles, 7 red marbles, and 5 green marbles. What is the probability of obtaining at least 2 red marbles in three draws with replacements? I have the answer, just can't figure out how to get it. Thanks!

calculus
solve the following differential equation: y' + (y)tanh(x) - 2e^x = 0

english
If you have Microsoft 2007 you can try copying and pasteing the speech into the word document. Then click the review tab, then the translator tab next to the spelling and grammar checker under the thesaurus tab,then select which language to which language, and then press the ...

engl - citing
Is this individual someone you know personally? If it is someone you know personally you can just put what she said in quotations and not worry about citing what she said. You do not need to cite that type of information. On the other hand, if you received the information from...

Eth 125
Sam, I am currently in my eigth week of this class. This was my response to the discussion question. I hope this answer helps you. The ones that are most difficult to overcome are health care, housing, criminal justice, and education. These four societal challenges are ...

research writing
Use sources provided by the university library, your local library, peer- reviewed articles, and sites ending with gov and/or org. Wikipedia is useful but the information needs to be double- checked and researched. Some instructors will not all information from wikipedia ...

crit thinking
Guzy, I just finished that course in October. The whole point of the class is for you to think critically. I know the assignment was a bit of pain but without learning to think critically on your own, the rest of your upcoming classes will become difficult if you cannot.Best ...

math
8(5-n)=2n

jj pearce
8(5-n)=2n

SCI
Should we eliminate fats from our diets altogether and increase proteins? 2. What are some of the benefits that unsaturated fats provide when included in a balanced diet.

statistics
What is the median in the following set of values? 4, 7, 19, 22, 27, 39, 47

math
UMBRELLAS White = 6 Blue = x Red = 5x Green = 3x Black = x + 9 Purple = x + 2 The equation... 6 + x + 5x + 3x + x + 9 + x + 2 = 50 We know that purple is 5 so... x + 2 = 5 x = 5 - 2 x = 3 Now we know that x = 3. This is the problem we started off with 6 + x + 5x + 3x + x + 9...

health
the office hires an employee who's deaf, but who can lip read. what will the employer have to do in terms of this employee's job duties to comply with the americans with disabilities act?

statistics
Can you tell me the z score for the following numbers? 10, 12, 16, 18, 19, 21. Thanks, I am getting the wrong answer each time I do it.

music
how can i write really good song lyrics? i suck at writing! can someone help or better yet, give me a verse to work with? thnaks

Statistics
When calculating percentiles, ie the 33rd percentile, do you use the lower limit of the group that contains the 33rd percentile? as in this case: 70-79 11 46 80.7 60-69 9 35 61.4 50-59 8 26 45.61 40-49 7 18 31.58 Would you use the number 49.5??

Math
thanx

Math

Math
What is the vertical asymptote of the function: f(x)= (X+5)/((X^2)-12X+36)

Physics
A fisherman notices that his boat is moving up and down periodically, owing to waves on the surface of the water. It takes 2.90 s for the boat to travel from its highest point to its lowest, a total distance of 0.640 m. The fisherman sees that the wave crests are spaced 7.60 m...

Physics Problem
The portion of string between the bridge and upper end of the fingerboard (the part of the string that is free to vibrate) of a certain musical instrument is 60.0 cm long [.6m] and has a mass of 2.23 g [.00223kg]. The string sounds an A4 note (440 Hz) when played. Where must ...

chemistry
im given the refractive index values of two - isobutyl bromide (1.3785) and isobutyl chloride (2.4368). the solution's refractive index is 1.3931. determine the molar composition (%). im not sure how to get the concentrations of Br and Cl. i have this so far- 100 * 1.3931...

ochem lab
this deals with TLC chromatography: if 2 compounds have same Rf under identical conditions, does it show that they have identical structures? i think it does. but im not sure why. thanks mucho.

Science
What processes must a stone undergo if it is to be made ready for use in jewelry?

Science
I need help writing a procedure for my Earth Science class. Our teacher gave us 5 minerals and told us 5 mineral names, but we have to figure out which is which. We could do tests like specific gravity, luster, streak, and hardness. I decided to do hardness and streak. I wrote...

social studies
the early bstone age people had to learn to adapt to their what?

Math
yes

Written communication
How can I re-write this sentence? Each advisor was contacted by his students. Assignment: Inclusive Language:Making Language Nonsexist http://www.jiskha.com/search/search.cgi?query=Each+advisor+was+contacted+by+his+students All advisors were contacted by their students.

Accounting1 - ethical issue
Discount Hardware Wishes to expand its business and has borrowed \$200,000 from the Toronto Dominion Bank. As a condition for making this loan, the bank required discount hardware to maintain a current ratio of atleast 1.50 and a debt ratio of no more than 0.50, and to submit ...

Accounting1 - ethical issue
Gorries Bearing Company makes all sales of industrial bearings under terms of FOB shipping point. The Company usually receives orders for sales approximately one week before shipping inventories to customers. For orders received late in december Bob Gorries, the owner, decides...

Accounting1 - ethical issue
On a recent trip to Brazil, Carlo degas, sales manager of cyber systems, took his along for a vacation and included her airfare and meals on his expense report, which he submitted for reimbursement. Chelsea Brindley, vice president of sales and Degas boss thought his total ...

Accounting
John Sullivan owns appartments buildings in Nova Scotia, New Brunswick, and Quebec. Each property has a manager who collects rent, arranges for reparis, and runs advertisements in the local newpaper. the property managers transfer cash to Sullivan monthly and prepare their own...

dilution
a 46.2 mL, .568 M calcium nitrate soln is mixed w/ 80.5 mL of 1.396 M calcium nitrate soln. whats the concentration of final soln? mols 1 + mols 2 = total mols mols/volume in L = M OH! thanks! i got the right answer, 1.09 M.

algebra
4x+2(250-x)=740 4x+500-2x=740 4x-2x=740-500 2x=240 x=120

chem 2
what is the mass of F in grams in 24.6 grams of SnF2? Convert 24.6 g SnF2 to mols SnF2. Convert mols SnF2 to mols F atoms. Convert mols F atoms to grams F atoms. 24.6 g SnF2*(1 mol SnF2/molar mass SnF2)*(2 mols F/1 mol SnF2)*(atomic mass F/1 mol F Atoms) = ?? Check my thinking...

chem
how many grams of sulfur are needed to react w/ 246 grams of mercury to form HgS? Hg + S ==> HgS unless your instructor insists on writing S as S8, in which case it will be 8Hg + S8 ==> 8HgS. The answer will be the same no matter which way the equation is written. I ...

Geography

pH
im trying to calculate the pH of a 1.0L soln containing 53.8 g of completely dissociated Mg(CN)2. is this the diss. equation? Mg(CN)2 + water --> MgOH + 2CN^- i don't think i did the problem rite b/c i got 15.7 for the pH. i got 53.8M Mg(CN)2 for the initial conc. or i ...

balanced equation
? MnO4– + ?H+ + ?C2O42– --> ?Mn2+ + ?H2O + ?CO2 what's the balanced equation? correct coefficients? is it 1MnO4- + 2H+ + 1C2O42- --> 1Mn2+ + 1H20 + 2CO2 ? c2042..? are you missing parenthesis somewhere? oh i see, no i believe this is correct: MnO4- + 8h+ + ...

chemistry
Write a net ionic equation for the reaction of the aqueous species ammonia and hydrofluoric acid. I don't think mine is coming out right- I don't know how NH3 reacts with other species, because I end up getting hydrogen as both an anion and a cation in the same species...

chemistry
How many electrons are transferred in the reaction of hydrogen peroxide with iron (II) ion in acidic solution to form iron (III) ion and water? i'm not sure if iposted this already... sorry if i did :) Fe^+2 ==> Fe^+3 + e 2e + 2H^+ + H2O2 ==> 2H2O Multiply equation 1...

oxidation
In the reaction of hydrogen peroxide with iron (II) ion in acidic solution to form iron (III) ion and water, the oxidizing agent is... ? Fe(II) ==> Fe(III) H2O2 ==> H2O. Fe goes from +2 to +3, that is a loss of electrons, so it is oxidized (by definition, oxidation is ...

pH- from saturday
i posted this question previously and got help however im still having some confusion. can u clarify ? what's the pH of the acid HC2H3O2 with concentration of .15? Bob Pursley worked that problem for you and gave it as [x^2/0.15] = Ka. What is it you don't understand? ...

pH- really hard one
What is the pH of the solution created by combining 1.00 mL of the 0.10 M NaOH(aq) with 8.00 mL of the 0.10 M HCl(aq)? with 8.00 mL of the 0.10 M HC2H3O2(aq)? NaOH + HCl ==> NaCl + H2O So all the NaOH is neutralized leaving NaCl, which will not affect the pH either way, ...

pH- part 2
how much .10M Base (in mL) is needed to neutralize 8.00mL of .10M Acid? base- NaOH, acid- HCl, base volume (mL)- ? base- NaOH, acid- HC2H3O2, base volume (mL)- ? VaNa=VbNb Vb= 8ml*.10N/.10N= 8m.

pH
what's the pH of the acid HCl with concentration of .15? the acid HC2H3O2 with concentration of .15? I figured out the pH of HCl, but I'm still not sure how to find the other one... What is the dissociation constant for acetic acid? K= [H+][ace-]/.15 pH= -log sqrt (.15...

Sales tax
650

equilibrium constant
find eq constant at 910K. CCl4 (g)--> <--CCl4(l) given: Gf CCl4(g)= -53.7 Gf CCl4(l)= -68.6 G Products - G reactants = Delta G. Delta G = -RT ln Keq

English/Grammar/Appositives
Are the commas a correctly placed? 1. The term hardware refers to the computing equipment, itself. 2. The year, 1975, marked the arrival of the microcomputer Neither of those sentences needs any commas. =) Can u give me 3 examples of similies, metaphors and personification in ...

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