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1. Calculate the heat (calories) produced by the solution of 3.75 g of NaOH
Hint: Remember that the reaction is exothermic. 2.
1 answer
asked by
Maria
1,252 views
I have a few questions.
1. write the net ionic equation for a precipitate when solutions of magnesium nitrate and potassium
1 answer
asked by
Christine
916 views
Was Mercury the first superconductor?
No. http://www.jiskha.com/display.cgi?id=1161728962 see what happened in 1962 Thanks for
1 answer
asked by
maria
360 views
assuming you have o.4g of Y(OH)3, calculate the mass of Ba)2 required to produce YBa2Cu3O7.
Is that BaO2 for Ba)2? Is that really
1 answer
asked by
nick
542 views
assuming you have o.4g of Y(OH)3, calculate the mass of BaO2 required to react stoichiometrically to produce YBa2Cu3O7. Now
1 answer
asked by
nick
1,104 views
I have a few questions on how to do a few problems that I got wrong for homework.
1. If 5.28 g of tin reacted with fluorine to
3 answers
asked by
Chris
568 views
Assuming that you have 0.4g of Y(OH)3, calculate the mass of of BaO2 required to react stoichiometrically (1Y:2Ba:3Cu) to
3 answers
asked by
mary
1,038 views
The specific heat of silver is 0.237 J/goC
Its melting point is 961oC . Its heat of fusion is 11 J/g. How much heat (in J) is
1 answer
asked by
mary
762 views
What is the arrangement of particles for a liquid? A gas?
Thanks in advance. http://en.wikipedia.org/wiki/Phase_(matter)
1 answer
asked by
Damien
452 views
Indicate which is lower in energy in a many-electron atom:
3d or 4s Would it be 4s [because it fills before 3d]? That is correct
1 answer
asked by
Alyssa
418 views
The chemical method of analysis in determination of the blood alcohol content %BAC is:
K2Cr2O7 + H2SO4 + C2H5OH ---> Cr2(SO4)3 +
1 answer
asked by
nick
879 views
What is the role of energy in physical changes?
http://www.chem4kids.com/files/matter_chemphys.html Thank you.
1 answer
asked by
Lulu
410 views
if ferric chloride was added to an unknown which happened to be benzophenone to identify if it has the phenol functional
3 answers
asked by
kim
1,463 views
There are several exceptions to the octet rule found along the transition and rare earth metal sections. These exceptions are
1 answer
asked by
Alexa
549 views
posted this question before and wanted to know if I had gotten the right answers.
We have to identify the five compunds of H, N,
1 answer
asked by
Sam
532 views
why do good oxidizing agents easily reduce?
Good (strong) oxidizing agents are easily reduced. What you said I think differs
1 answer
asked by
Tanya
503 views
What type of hybridization corresponds to what type of bond?
numerous kinds. sp3 is tetrahedral, sp2 is trigonal planar, sp is
1 answer
asked by
john
450 views
I have a really urgent question. I am wondering wheter or not esters are polar and what types of intermolular forces they have.
c
1 answer
asked by
steff
456 views
what kind of intermol forces can be seen in this molecule CH3COOCH2C6H5
is it only dispersion? If you mean BETWEEN molecules,
1 answer
asked by
steff
462 views
if a 10cm cube pipette were not available, which one of the following would be the best way of measuring a 10cm cube portion of
1 answer
asked by
minerva
519 views
trighloroethane is a slvent used to remove grease from clothings. how, after use, is the solvent separated form the grease?
a,
1 answer
asked by
minerva
506 views
Can someone please help me with the following questions?
1:Suppose you were given an ancient wooden box. If you analyze the box
3 answers
asked by
Margaret
1,149 views
At what temperature will a molecule of UF6 have the same average speed as a molecule of hydrogen gas at 37 degrees C?
I was
1 answer
asked by
Cuzzy
830 views
One atmospheric pressure is that which will support a column of mercury 760.0 mm high. Show that 1 atm equals 1.013 x 10^5
1 answer
asked by
Chris
506 views
Can someone help me with these please?
1) Use water as an example to contrast the properties of a compound with the elements from
1 answer
asked by
June
937 views
Does the mass of an object changes with location?
No. Weight depends upon location; mass does not. According to the theory of
1 answer
asked by
Dennis
407 views
The volume of any solid, liquid, or gas will change with _________.
temperature and pressure.
1 answer
asked by
Dennis
359 views
I need help balancing this redox equation:
H2O2 + Ni+2 --> H2O + Ni+3 in basic solution. Here's what I have so far: Ni+2 --> Ni+3
4 answers
asked by
Chris
2,261 views
If a thermometer is calibrated to the nearset degree, what part of a degree can you estimate the temperature it measures?
Doesn't
1 answer
asked by
Anonymous
579 views
what does coefficients in equations mean, in chemical terms?
2NaCl means we have two molecules or 2 mols of NaCl. Most texts
1 answer
asked by
luke
491 views
how is the oxide of arsenic worked out when its in its gas state
please help im flumuxed Please clarify your question? What do
1 answer
asked by
donald
389 views
Are aspirin, starch and dextrose covalent or ionic?
Do aspirin and or epsom salt conduct electricity? Any help with these
4 answers
asked by
Fidelia
1,046 views
hi can anyone help
how do i determine the molecular formular of the oxide of arsenic in its in its gaseous state the answer i got
1 answer
asked by
bex
613 views
could anyone tell me why the molecular formula of agas is not always the same as the empirical formula
tnx It may be a dimer or a
1 answer
asked by
bex
503 views
C2H4Br2 + 3 I- -> C2H4 + 2Br- + I3-
[C2H4Br2]M [I1]M Initial Rate (M/s) 1 0.127 0.102 6.45 x 10-5 2 0.343 0.102 1.74 x 10-4 3
1 answer
asked by
kim
498 views
The (aq) solution with the lowest freezing temperature would be which of the following:
0.010M NaCl 0.020M NaCl 0.030M C6H1206
2 answers
asked by
anonymous
615 views
The activation energy of a certain reaction is 30.3 kJ/mol. At 20 C, the rate constant is 0.0130 s^{-1}. At what temperature
1 answer
asked by
kim
535 views
copper has two naturally occurring isotopes. Cu-63 has a mass of 62.939 amu and relative abundance of 69.17%. Use the atomic
1 answer
asked by
Jill
1,270 views
Hi the following comes from my first homework assignment in AP Chemistry. I am totally lost on this question and don't know
2 answers
asked by
manny
655 views
An automobile burns 65 grams of gasoline over 20 minutes. The gasoline combines with 100 grams of oxygen in this reaction, to
1 answer
asked by
tina
685 views
PLEEEZE help
name the type of reaction K + MgBr -> Not enough information is provided. And not magnesium bromide is MgBr2. Is
1 answer
asked by
key
897 views
which of the following is a chemical reaction?
A) propane forms a flame and emits heat as it burns. B) Acetone feels cold as it
4 answers
asked by
Jenn
2,882 views
For the reaction 3NO2 + H2O � 2HNO3 + NO, how many grams of HNO3 can form when 1.00 g of NO2 and 2.25 g of H2O are allowed to
4 answers
asked by
meghan
4,528 views
oh thanks
If you have CH4, does the 4 apply to both the C and H or only to the H? It is the H that is four. only the H
1 answer
asked by
Lydia
265 views
I can't seem to figure this out!
I know I have to use mass to mass conversions though. Can someone help me out? Hydrochloric acid
3 answers
asked by
Abby
2,759 views
Consider the following reaction:
2 CH3OH + 3O2 to form 2 CO2 + 4 H20 Each of the following molecular diagrams represents an
3 answers
asked by
david
1,883 views
can anyone help me with this question
what is the advantages and disadvantages of hydrogen power as opposed to hydrogen fuel,
2 answers
asked by
ana
701 views
Can someone please help me balance this equation?
CH3OH + O2 ===> CO2 + H20 Thank you! CH3OH + O2 ===> CO2 + H2O To balance the
1 answer
asked by
Abby
656 views
Can someone check this for me?
Predict which reactions are spontaneous: a) Zn(s) + 2H+(aq) --> Zn+2(aq) + H2(g) b) CaCO3(s) +
1 answer
asked by
Chris
891 views
Consider a Carnot engine operating between the temperatures of 300. K and 189 K. Find the efficiency of this engine. Assume,
1 answer
asked by
Chris
570 views
I have to balance an equation and I had to make the equation from an experiment we did.
So far, my equation looks like this and I
1 answer
asked by
Abby
598 views
If an ideal gas is allowed to expand into a vacuum, this means that the external pressure is 0. This doesn't affect the internal
1 answer
asked by
Chris
596 views
can someone give me examples of the explanatory power of the quantum-mechanical model?
Power to explain what? The nature of the
1 answer
asked by
ashley
602 views
can someone tell me which of the following elements are expected to be the most easily reduced: Ca, Sr, P, or Cl?
thanks
1 answer
asked by
Donny
454 views
In Fe(NO3)3, how many Fe atoms are there?
One, three N, and 9 O. thank you
1 answer
asked by
Lydia
362 views
Methyl alcohol can be used as a fuel instead of, or combined with, gasoline. A sample of methyl alcohol, CH3OH, in a flask at
2 answers
asked by
Chris
1,407 views
Can someone glance over my work and see if it looks right? I'm certain about it because my units seem to be a little odd.
Chlorof
1 answer
asked by
Chris
496 views
How do these things shift the direction of a chemical reaction?:
-adding/removing reactants -adding/removing products
1 answer
asked by
Mira
771 views
how do u calulate percentage composition of NO2
[mass N/mass NO2] x 100 = %Nitrogen [mass O2/mass NO2] x 100 =%oxygen
1 answer
asked by
san
983 views
In the equation:
2Al+6HCl-->2AlCl3+3H2 Why is the hydrogen by itself instead of the chlorine? Al is above hydrogen in the
3 answers
asked by
Amie
1,730 views
For a double replacement reaction to occur, is it that one of the products must be insoluble and form a solid?
There has to be
1 answer
asked by
Amie
558 views
when a gas is collected over water, is the gas pure?
No. It has water vapor in it.
1 answer
asked by
david
335 views
State the type of reaction. Predict the products of the reactions. I have no clue how to do this any help?
C3H8 + O2 ---> Mg +
1 answer
asked by
Paul
778 views
are these already balanced?
CuSO4 + Zn ---> CuZn + SO4 AgNO3 + NaCl ---> AgCl + NaNO3 AgNO3 + NaCl ---> AgCl + NaNO3 CuSO4 + Zn
1 answer
asked by
Paul
750 views
Will someone help me with this problem, please?
Calculate the mass in grams of 1.20*10^24 molecules of CO2. Well, convert it to
3 answers
asked by
Annette
793 views
help me i hev a lab
You need to post a question with details about what yo don't understand.
1 answer
asked by
cool
468 views
For this problem, will someone please check my answer?
How many grams of oxygen are produced in the decomposition of 5.00g of
1 answer
asked by
Fiona
573 views
How do you balance this equation?:
(NH4)2SO4+Ca(OH)2==>CaSO4+NH3+H20 Thanks! 2 NH3 2H2O Others are ones. (NH)2SO4 + Ca(OH)2 -->
2 answers
asked by
Fidelia
1,565 views
hey guys I posted this awhile ago im not sure if anyone has read it or whatever but here it is again find the PH of a .00580 M
1 answer
asked by
chris
603 views
this is my question
Calculate the hydronium ion consentration and the hydroxide concentration in blood in which the PH is 7.3. I
2 answers
asked by
Jon
1,466 views
I am posed with a question which, in order to be solved, needs the Van't Hoff Factor of ethylene glycol. Some research has shown
1 answer
asked by
Jakob
558 views
Liquids A and B form an ideal solution. A certain solution contains 25 mole % of A, whereas the vapor in equilibrium with the
1 answer
asked by
Chris
1,066 views
confused about this one.
2 samples of water of equal volume are put into dishes and kept at room temp for several days. the water
1 answer
asked by
david
1,134 views
Forty miles above the earth's surface the temperature is 250 K and the pressure is only 0.20 mm Hg. What is the density of air
3 answers
asked by
Helpme
1,523 views
Consider the equation A <-> in a 1L container. At 7.57C, the molar concentrations of A and B are 7.228M and 1.976
1 answer
asked by
Marisol
460 views
A solution contains 32 g of KNO3 per 100g of water at 25 degree C. Is the solution unsaturated, saturated, or supersaturated?
I
3 answers
asked by
jake
1,118 views
a 45.8mL sample of a 5.8 M KNO3 solution is diluted to 1.00L. What volume of the diluted solution contains 15.0g KNO3?
how do you
1 answer
asked by
kyle
1,341 views
How does molar mass affect the boiling point of covalent substances?
The general rule is that heavier molecules boil at a higher
1 answer
asked by
Lydia
368 views
Barium nitrate is added to a solution of .025 M sodium fluoride.
a) At what concentration of Ba+2 does a precipitate start to
2 answers
asked by
chris
1,867 views
calculate the change in enthalpy when 1.00g of hydrogen peroxide decomposes. H2O2(l) yields H2O(l)+ 1/2O2(g) (traingle)H-
1 answer
asked by
crystine cole
846 views
Nitrosyl Bromide Decomposes according to:
2NOBr(g) <=> 2NO(g) + Br2(g) *<=> is an equilibrium arrow( 1 mole each of NO and BR2
1 answer
asked by
annonymous
690 views
45.0 grams of water vapor is cooled from 150 to 101 degrees celsius. How much heat energy was lost?
heat=
1 answer
asked by
jess
453 views
a test tube containing CaCo3 is heated until all the compound decomposes. If the test tube plus calcium carbonate originally
4 answers
asked by
laura
2,443 views
is it true that ethanol on skin feels cold due to the evaporation of the alcohol
yes. But any solvent with a decent vapor
1 answer
asked by
Anonymous
392 views
The equilibrium constant Kc equals 5.90 for the reaction
CH3COOH + C2H5OH <==> CH3COOC2H5 + H2O Find the molar concentrations of
1 answer
asked by
JP
816 views
can someone plz help me with this?
What mass of sucrose (C12H22O11) must be dissolved to make 460 mL of a 1.10M solution? thanks
1 answer
asked by
Mary
764 views
Ammonia is very soluble in water. Why?
NH3 has a pair of unpaired electrons to which a hydrogen ion can add.
1 answer
asked by
anees
377 views
plz help
If you carefully place a steel razor blade flat on the surface of water, the razor blade can be made to float. Explain
1 answer
asked by
Natalie
1,290 views
Rank these in order of increasing freezing points:
C2H6O, NaCl, NaSO4, C12H22O11 I suggest that you look them up. You will have
1 answer
asked by
Helen
575 views
Can someone help me please?
1)Calcium chloride is found in salt mixtures that are used to melt ice on the roads in winter. The
1 answer
asked by
Mary
584 views
thanks
Is sodium nitrate polar or nonpolar and how do I figure this out? thanks You need to consult your text or your notes to
3 answers
asked by
Filmore
2,116 views
Sorry about that. I don't know why it did that? I will try to recap the two or three sentences I read. The oxygen molecules
1 answer
asked by
DrBob222
1,010 views
a 10.0% sucrose solution has a density of 2.00 g/mL. what is the mass of sucrose dissolved in 1.00 liter of this solution?
thanks
3 answers
asked by
mary
1,252 views
frozen carbon dioxide, CO2.
what is dry ice
1 answer
asked by
DrBob222
1,123 views
how many ions do each produce when in a 1.0M solution
CH3COOH Ca(NO3)2 NaNO3 NaCl H2SO4 To figure out this you have to be able to
1 answer
asked by
kim
1,109 views
For which element would you expect isotope effects to be of the greatest importance in CHEMICAL processes?
a.H b.He c.Li d.B This
1 answer
asked by
nivi
441 views
Which of the following oxides is not highly ionic?
BeO MgO CaO SrO BaO I believe is BeO because is an amphoteric oxide...may be I
1 answer
asked by
nivi
647 views
The most poisonous ofthe chemical elements is...
A.Ar B.As C.Be D.Bi E.Pu I thought in the beggining it was As, but got it
1 answer
asked by
nivi
373 views
1.Which of the following elements has the largest known oxidation number (in magnitude)?
Pt Au Os Fe Ru 2.Which of the following
1 answer
asked by
nivi
490 views
for 2Al2O3----> 4Al(s) + 3O2
the question is what is the heat change for the formation of 1 mol of aluminum oxide from its
3 answers
asked by
sara
770 views
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