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Trixie

Questions (48)

An object weighing 14N is swung at the end of the cord 0.80m long.the object makes 2.0 revolution per second.what is the
1. 0 answers
2. 149 views
A factory is to pack pencils in boxes of 8 and 10 pieces. What is the smallest number of pencils that can be packed using the
1. 6 answers
2. 8,308 views
I am doing the Character Analysis Portfolio, and need to make a thesis statement, answering the following questions:Why is this
1. 1 answer
2. 774 views
a menu which serves 4 people requires 3 cups of flour.how many cups of flour are needed for the menu to serve 12 people?
1. 2 answers
2. 1,197 views
a menu which serves 4 people requires 3 cups of flour.how many cups of flour are needed for the menu to serve 12 people?
1. 4 answers
2. 2,205 views
How do you find the points of intersection, if any, of the equations:x^2 + y^2 = 5 x - y = 1
1. 1 answer
2. 436 views
Q1. The blood volume in a cancer patient was measured by injecting 5.0 mL of Na2SO4(aq) labeled with 35S (t1/2 = 87.4 d). The
1. 2 answers
2. 1,216 views
One last question...even though no one seems to be willing to help me out without being rude.The blood volume in a cancer
1. 3 answers
2. 596 views
A radioactive sample contains 3.25 1018 atoms of a nuclide that decays at a rate of 3.4 1013 disintegrations per 26 min.(a) What
1. 5 answers
2. 1,418 views
A sample of pure cobalt-60 has an activity of 8 µCi.(t1/2 cobalt-60 = 5.26 a) (a) How many atoms of cobalt-60 are present in
1. 1 answer
2. 958 views
A certain Geiger counter is known to respond to only 1 of every 1000 radiation events from a sample. Calculate the activity of
1. 1 answer
2. 551 views
A certain Geiger counter is known to respond to only 1 of every 1000 radiation events from a sample. Calculate the activity of
1. 1 answer
2. 586 views
How much energy is emitted in each α decay of plutonium-234? (234Pu, 234.0433mu; 230U, 230.0339mu; 4He = 4.0026 mu).I tried
1. 3 answers
2. 1,309 views
for A, Z, and X I'm typing it in the form A,Z,X (or X as a particle) since I obviously can't do sub or superscript...1,1,H +
1. 8 answers
2. 643 views
How can you tell if [ MnCl6]4- or [ Mn(CN)6 ] 4- has the longer wavelength of light? and then how do you figure out how many
1. 0 answers
2. 524 views
Is Zn+2 diamagnetic or paramagnetic? I am a little confused on how to figure this out and I'm finding inconsistent answers when
1. 1 answer
2. 851 views
How can you tell if [ MnCl6]4- or [ Mn(CN)6 ] 4- has the longer wavelength of light? and then how do you figure out how many
1. 0 answers
2. 558 views
Trying to name this compound and figure out its oxidation state[ CoBr2(NH3)3(H2O) ]+ I came up with
1. 1 answer
2. 1,015 views
Which one of the following combinations of reagents will result in a spontaneous reaction?A) Al(s) + CuCl2(aq) B) Al(s) +
1. 1 answer
2. 846 views
A buffer solution of volume 100.0 mL is 0.150 M Na2HPO4(aq) and 0.100 M KH2PO4(aq). Refer to table 1.(a) What are the pH and the
1. 4 answers
2. 1,600 views
Calculate the pH of the solution that results from mixing the following reagents. Refer to table 1.mix 0.189 L of 0.019 M
1. 3 answers
2. 1,103 views
The pH of 0.50 M HBrO(aq) is 4.50. Calculate the change in pH when 6.50 g of sodium hypobromite is added to 110. mL of the
1. 5 answers
2. 1,462 views
1x10-2 mol of MgSO4 (Ksp = 9) is added to 1 L of water. Will 1x10-5 mol of CaSO4 (Ksp = 10-6) completely dissolve in the
1. 1 answer
2. 1,190 views
Asthma affects about seven percent of the population. During an asthma attack smooth muscle cells in the bronchi constrict, the
1. 1 answer
2. 565 views
100 mL of each of the following solutions is mixed; which one of the mixed solutions is a buffer?A) 1.0 M NH3(aq) + 0.6 M
1. 1 answer
2. 2,624 views
Which of the following systems could act as a buffer?A. HCl/Cl- B. NaOH/OH- C. HSO4-/SO4-2 D. H3O+/OH- E. All of the above my
1. 1 answer
2. 2,347 views
Given the equilibrium rxnCF4(g) + 2H2O(l) ⇔ CO2(g) + 4HF(g) ΔH < 0 if pressure is increased by adding argon gas to the
1. 1 answer
2. 733 views
If a weak acid is say only 5% ionized at equilibrium, then the ionization rxn would be reactant favored, correct? I am a little
1. 1 answer
2. 835 views
I am confused about why this is the answer to a practice problem I was given. (answer is c). Could someone explain why/why not
1. 3 answers
2. 786 views
Calculate the initial molarity of KNH2 and the molarities of K+, NH3, OH-, and H3O+ in an aqueous solution that contains 0.75 g
1. 4 answers
2. 1,463 views
Calculate the initial molarity of KNH2 and the molarities of K+, NH3, OH-, and H3O+ in an aqueous solution that contains 0.75 g
1. 2 answers
2. 1,021 views
In a .1M aq. soln of NaCN, how would you determine the major species (other than water)? And how would you determine the pH (not
1. 3 answers
2. 561 views
Calculate the equilibrium constant at 25°C and at 100.°C for each of the following reactions, using data available in Appendix
1. 2 answers
2. 764 views
When 1.00 g of gaseous I2 is heated to 1000. K in a 1.00 L sealed container, the resulting equilibrium mixture contains 0.830 g
1. 2 answers
2. 627 views
When 1.00 g of gaseous I2 is heated to 1000. K in a 1.00 L sealed container, the resulting equilibrium mixture contains 0.830 g
1. 0 answers
2. 1,242 views
A 1.00% by mass MgSO4(aq) solution has a freezing point of -0.192°C. Water has a kf of 1.86 (K·kg)/mol.(a) Estimate the van't
1. 6 answers
2. 1,015 views
I still need help with this problem...Calculate the concentration of the solution the molality of hydroxide ions in a solution
1. 1 answer
2. 1,028 views
Calculate the concentrations of each of the following solutions.(a) the molality of chloride ions in an aqueous solution of
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2. 1,082 views
Determine the temperature change when 18.0 g of the following salt is dissolved in 190. g of water. The specific heat capacity
1. 6 answers
2. 748 views
Solve the inequality:2x-1 / 3x-2 < 1 [the < is actually less than or equal to] I got one of the answers, x is less than or equal
1. 2 answers
2. 2,412 views
i need two examples of situations where you would think help/charity should be given but it didn't happen as you thought
1. 2 answers
2. 483 views
hi.i would like to know if someone can send me websites other than wikipedia that might be able to help me find out stories of
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2. 712 views
i have just finished reading "A Pair of Silk Stockings" by Kate Chopin and i do not get what the story is about.can someone
1. 6 answers
2. 1,198 views
if a doctor prescribes 30 units of insulin in 500 ml to be administered over 2 hours, how many drops per minute should be
1. 1 answer
2. 467 views
hii am doing a research report on proving that the animals from the past were different and more dangerous then they are now....
1. 15 answers
2. 736 views
Kirk and Montega mow the soccer playing fields. They must mow an area of 500 ft long and 400 feet wide. They agree that each
1. 3 answers
2. 930 views
MArta has $6000 to invest. She puts x dollars of this money into a savings account that earns 2% interest per year. With the
1. 2 answers
2. 643 views
the teacher accendentally reversed the digits if a test scored and shorted a student 36 points. SHe told the students that the
1. 4 answers
2. 476 views

Answers (52)

What grade? Lesson? Unit?
I would say research.
I figured out the first one...still struggling with the 2nd...
Could you please just explain what I am doing wrong so that I can know how to approach these problems? I appreciate the advice and am well aware I need to go to bed...but I have to get these finished and my professor is out of town attending a memorial
I also posted the above well before Dr. Bob had answered one of my other questions...
Sleep is a bit of a luxury.....unfortunately I'm one of those students that doesn't have an option of taking a lighter load or working less....luckily I graduate in a few weeks. In the meantime I need to finish these problems so that I can go to bed....but
I wasn't talking about DrBob being rude...that would be bobpursely...DrBob has been nothing but helpful while I have used this site as a resource.
Another attempt I made gave me relatively "reasonable" answers...but still doing something wrong. I converted the minutes to days and used that in the rate to find k via k= rate/N ; N being 3.25E18 atoms. this calculated k to be .00145. I plugged this into
Oh and when I try to put this into my calculator I get 0... sorry if I am not catching on fast enough for some....I worked graveyard last night and Haven't slept in over 35 hours...
Hmm...I don't know. My webassign is telling me it's not a neutron. Thanks
Oh i just realized how you typed the equation has the product flipped. so it's 1,1,H + 1,1P --> 2,1H + ? order is A,Z,X where A is mass and X is the particle or element
neutron was my first answer...i am using +1 e^0 to be a positron though, not electron.
Nevermind...I realized that the problem I was using as an example called for 1 g of the reactant used....this didn't....so I have my correct answer now. Thanks! Still stumped on my earlier question though...
no problem :)
Think of the equations you have learned and which variables you have been given. It helps to keep a list of them in front of you so you can quickly figure it out. Then just plug in. If you have P, V, mass, and T....you're going to use PV=nRT...just solve
I know they need to balance out on both sides. I am just confused because I am pretty sure it should be 0,+1, e ...e being X. Webassign is telling me this is wrong but if that's true I don't understand why and need that explained....
You know it's second order so your rate=k[NO2]^2 All you do is like you said, find moles, use that to find molarity (convert mL to L) and then plug the concentration into the equation. You're given the k. Same thing with part B, just changing the
All you have to do is find the concentration of OH- and solve for pH (pOH= -log [OH-] nad then 14-pOH=ph [OH-} = Ksp/[M+}
NVM i was using the pKA instead of pH....i had it right afterall...guess it's just time for bed....
I figured out the correct new pH for each respective part, but apparently the initial pH i found for the buffer solution is incorrect. I just need help in figuring that so I can calculate the change. I initially thought the buffer pH was 7.38. Thanks!
for part a I tried using the HH equation, found moles of NaOH and used that for [base] and moles Na2HPO4 as [acid]...i used pKa 7.21...that was incorrect. For part b I used a similar method...plugging in HNO3 as the [acid] and Na2HPO4 moles as [base] the
I'm confused how I would use the Ka equation in the HH equation??? I thought HH was just pH=pka + log([base]/[acid]) ...
Nevermind I got it...I just mixed up my variables a little. thanks!
I am pretty stuck...not sure if I used the Henderson-Hasselbach the right way and I'm a little confused on how to set up the Ka expression...
I am trying to use pH=pKa + log(acid/base) to see where that gets me...I'm attempting to find the [base] using the given pH and pKa of 8.69 (for HBrO)...then use the concentration to find the new pH...
I see how there are the numbers of particles in solution, I am a little confused on how that relates to these properties. My text is pretty brief over this section.
Right...I am confused on the solving for x part. Before when I have used this I have always been given ka or kb in order to solve for x. This time I'm not--so I don't know how to set up my equation to find x. Once I have x I know how to do everything else
Well I'm not actually making it in a lab...I just don't fully understand the concept of this
I figured out what I was doing...I ended up using the Van't Hoff Equation and the enthalpies of formation to solve for K at 100 C. This stuff is so time consuming...
nevermind--after 50 hours of pulling my hair out I finally arrived at the answer :)
I've heard this one before: "A meteor is a flash of light made by a falling meteorite"
And when solving for molality do I need to use the formula dT=Kf*molality? Or do I find it independently of this equation?
I am confused by the 1% by mass part...I don't understand what it really even means or if I am multiplying something by 1% or what? I did eventually realize I had to multiply by 3--I have never seen a problem like that before so I was slow to catch on.
the answer for a was actually incorrect
Got it. for A i was using molar mass for FeCl3 instead of water..oops. I solved C...but I am still confused with the second question of anyone can help me out... Thanks!
Just want to double check...so for KCl, because it is endothermic, my q should then be negative?
Ok, thanks for your help
no I didn't get that, but I was adding both 18g of the salt and 190 g of water for the m used in the equation. I'm still a little confused with the signs...I thought if it is releasing heat then q would be negative? I did manage to get the same value for q
I mean x is greater than or equal to, not less than. sorry.
oh ok...thank you very much
It seems hard to come up with a theme for this story and i am usually good at figuring out themes of stories
she starts off by buying a pair of silk stockings and then buys shoes and then gloves...and she ends up spending the money on herself... what would the theme of the story be though?
thank you very much
ok thank you...
ok...thank you... one more thing..do u have any good websites in which they include information about each type of animal???i would like them to explain maybe a brief thing about how that certain type of animal was different to the ones now
i have a lot of info. on different animals do u suggest including info. about reptiles, mammals, ect. [[in general]]???
yes...but...wat else other than information about da animals can i add???
the problem is that i have info on many animals because the report must be 4 to 5 pages long
thanks for the websites... how do u think i should split up my information though???
da animals i researched to provve how big they are existed millions of years ago...wat i am trying to prove is that if those animals were still alive...they would be very dangerous to have around...because of their size and stuff like that... i just need a

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