Total # Posts: 1,446
"Find the pH of the solution obtained when 32 mL of 0.087 M ethylamine is titrated to the equivalence point with 0.15 M HCl? Do I need to do a rice table for this problem? I'm having difficulty starting this problem... Thanks!
May 21, 2007
how do you calculate metric surfaces? not sure what you mean. are you finding areas of surfaces that have metric units? are you converting between units of area in the metric system? give a specific example or problem.
May 18, 2007
What is the relationship between the word assignment and the following sentence? "The noble elephant marched near Goshen, Indiana," said Sam's aunt. Please rephrase and repost. Your question is not clear. Thanks. =)
May 14, 2007
Child Develpoment-- Question
Can you help with this question? As a caregiver of an infant, meaningful communication between you and the parent, gently introducing new parenting techniques, can sometimes be done lightly by which? A. "talking through the baby." B. waiting until the mother is ...
May 8, 2007
Hi, I would like to know if I did this problem correctly. Your help would be greatly appreciated! "Chlorine, Cl2, is produced commercially by the electrolysis of aqueous sodium chloride. The anode reaction is 2Cl-(aq)---> Cl2(g) + 2e- How long will it take to produce 2...
April 30, 2007
LORD OF THE FLIES
at the end of the novel Ralph cries. what is he crying about? I take you didn't read the book. http://www.freeonlineresearchpapers.com/lord-flies-summary-by-william-golding Check this site... it explains it carefully. See top quote. http://www.sparknotes.com/lit/flies/...
April 24, 2007
I am having trouble with the balancing the oxidation-reduction equations that are in a basic solution. This is the first one that I'm doing that's in a basic solution, and I can't get it! I get everything right except I get 2H2O instead of one on the left. MnO4- + ...
April 22, 2007
Hi, I posted yesterday with this lab question. "Calculate the molar amounts of NaOH used in the reaction with the HCl solution and with the HC2H3O2. I think I got the answer to that with the help that I received. I had 5 mL of HCl, and I was using .100 M NaOH, so I got ...
April 22, 2007
We did a lab for acid-base titrations, and I'm having trouble with my post lab questions because I had trouble with acid-base reactions and titrations in the first place! "Calculate the molar amounts of NaOH used in the reaction with the HCl solution and with the ...
April 21, 2007
Use these answers for questions 4 - 7. (A) 1s2 2s22p5 3s23p5 (B) 1s2 2s22p6 3s23p6 (C) 1s2 2s22p62d10 3s23p6 (D) 1s2 2s22p6 3s23p63d5 (E) 1s2 2s22p6 3s23p63d3 4s2 4. An impossible electronic configuration 5. The ground-state configuration for the atoms of a transition element ...
April 12, 2007
Use the following answers for questions 1 - 3. (A) F (B) S (C) Mg (D) Ar (E) Mn 3. Forms oxides that are common air pollutants and that yield acidic solution in water I think the answer to this one is B, but why is it B? I see how it would yield an acidic solution, but what ...
April 12, 2007
Teacher observation and subjective analysis of children are: 1.similar and done in the same way. 2.different and should be done separately. 3.Easiest to do while supervising. I vote for # 2.
April 10, 2007
I need major help with this problem! especially with the first equation that is used... A buffer is prepared by adding 115 mL of 0.20M NH3 to 145 mL of .15M NH4NO3. What is the pH of the final solution? Use the Henderson-Hasslebalch equation.
March 28, 2007
f=p(c-1)-c(p-1) sOLVE FOR p f=pc-p-cp+c pc - cp = 0 So now we have f = -p+c Move "p" by itself. f-c = -p Now we multiply each side by -1 p = c-f Let's plug in values for f and c to check. We'll say: f=2 c=3 p=3-2 p=1 in this case. Now, let's plug in the ...
March 20, 2007
What are 3 alternate sources of cleaner electricity? cleaner than what? i think you speak from alternative, renewable energy sources. examples are wind, photovoltaic, biomass or water. the advantage of these is that they do not emit greenhouse gases (ghg). to see how bad ...
March 12, 2007
Chemistry Science Project
I need some ideas for high school science projects. It doesnt really matter what field of science, but i would prefer chemistry, biology, or physics. Really Urgent! Thanks! What about a project on osmotic pressure. Put a salt solution inside a thistle tube, place a membrane ...
March 8, 2007
Simplify: 3/5 x 13.65 - 2/9 x 1.307 When I work this problem I get: 7.899555556 _ Would that be: 7.89 (or) _ 7.8995 The answer depends upon the order of operations, which must be clarified with parentheses and brackets. What you calculated is [(3/5) x 13.65)] - [(2/9) x 1.307...
February 24, 2007
I have this question on a homework assignment and I am confused! It is not wise to rely on the__________ to determine whether a stereotype exsists in a book. (Here are the choices the assignment gives me to complete the sentence) A. title B. illustrations C. book's format ...
February 4, 2007
help me unscramble this word
ok can you help me unscramble this word "ANLDEGN".When it is unscrambled it its either the name of an ocean, country, state, city, or animal. Try these: http://www.ssynth.co.uk/~gay/anagram.html http://www.unscramble.net =) Thank you for using the Jiskha Homework ...
January 25, 2007
I am interested in doing a science project on the math and science of different snowboarding tricks and techniques. Does anyone have advice and suggestions about how to do a project like this?? Please help! Very Urgent! Well you could do a nu,ber of different things. You could...
January 23, 2007
A bungee jumper leaps from the top of a building that is 420 feet tall and falls at an average rate of 95 feet per second. at the time of the jump, the elevator is at a height of 130 feet and rising at a rate of 3.6 feet per second. about how many seconds will pass until the ...
January 7, 2007
Hello! I need help with knowing how to find certain data in the L3 and L4 columns using my calculator and plotting the graph to know which order the reaction is. I know you go to stats then to edit, and you put in the given info into L1 and L2. After that, you scroll up to L3 ...
January 7, 2007
I know how to find half-lives, but I have trouble finding the length of time it would take for the concrentration of X to decrease to Y% of its initial value. For example, this is one of the problems: Methyl isocyanide, CH3NC, isomerizes when heated to give acetonitrile (...
December 16, 2006
Not sure if anyone can help, since it's due todayy, but I need a term. What is the term for this? A biologist who desribes, names and classifies organisms? Help would be great. Taxonomist
December 15, 2006
Chemistry - Explain...
Hello! I'm hoping you can please help me with this! I left my book at school (I thought I'd left it in my backpack all day to bring home), and I'm in desperate need of your help because I have a test tomorrow. "Answer the following questions, which refer to ...
November 28, 2006
"Given Molality, calculate..."
"Given: An aqueous solution of C6H12O6 with a density of 1.18 g/ml" I) Calculate Molarity 1) It firsts asks me to, "State the moles of solute" 2) Calculate the mass of the solute in grams - I think I can do this if I know how to get #1 3) Later it also asks...
November 19, 2006
2. The line y = 4x - 7 crosses the y axis at: a.(4, 0) b.(0, 4) c.(-7, 0) d.(0, -7) Set y=0 and solve for x You can automaticallly elimintae b. and d. because y has to be 0 when the line crosses the y-axis. Something seems to be wrong with your other choices too, recheck them...
October 23, 2006
Hi I was wondering if anybody could explain what "winged words" are in terms of the Odyssey? Thanks. Thank you for using the Jiskha Homework Help Forum. Here is the definition from allwords.com Definitions winged words plural noun 1. literary: Meaningful words spoken...
September 14, 2006
I'm stuck and am hoping you can help. Here is the problem: You react 7.92 grams of silver nitrate, AgNO3(aq), with an excess of sodium chloride, NaCl(aq). How many grams of silver chloride, AgCl(s), will precipitate from the solution? Any help would be appreciated. Most of...
September 9, 2006
Quadrilateral JKLM is a rhombus. If mangleLMK = 36, find mangleKJM In the right triangle ABC, mangleB = 90, AB = 5, and AC= 12. Find BC. Round to the nearest tenth, if necessary. Help? Is AB a side and AC a side? I can't tell from your description which are sides and which...
August 21, 2006
Fellow AXIA student here as well. This is so funny that this post has been going for 3 years. I am going to reread chapter 2 to see if I had missed something. Thanks for everyone's input.
July 20, 2006
Please Help Me On This GCSE Higher Question
Can anyone answer this question which is in a form of a fraction? Simplify: 8x^2+20x-12/8x^2-2 Thanks What does this expression equal? What do you mean by the word "answer"? Did you mean to type 8x^2+20x-12/(8x^2-2)=0 ? the answer is: 2(x+3)/2x+1 ) In an election ...
June 23, 2006
For summer work i have to make a notes summary of each required book ive read..the problem is ive never heard or even seen a notes summary before and i am a visual learner can someone please send me an example of one or at least a format of how its done? There are several ways...
July 16, 2005