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Chemistry
Page 75
Questions (96,696)
what is the symbol of the element with 4d^4?
1 answer
asked by
Jazmin
347 views
Determine the concentration of a dioxin solution whose percent absorbance is 0.40%
1 answer
asked by
Stacey
349 views
How many moles are there in a 4.3 mole of tungsten?
1 answer
asked by
Chelly
344 views
How many moles are there in a 4.3 mole of tungsten?
1 answer
asked by
Chelly
347 views
Are Lewis acids and bases defined using dissociation, electron pairs, hydrogen ions, or hydroxide ions?
1 answer
asked by
tori
373 views
Why is there no reaction between Cr2(SO4)3 and Na2SO4?
1 answer
asked by
Sarah
362 views
I need to find the rate constant.
I know that it takes 2A to make B, but I am mixed up on how to figure out how to find the
1 answer
asked by
Val
368 views
The half-life for the second-order reaction of a substance A is 55.8 s when concentration of initial A = 0.69 M. Calculate the
4 answers
asked by
Val
428 views
Can you please someone check my answer for me? I don't know how to start thses answer. Chemistry is not my things. Please give
1 answer
asked by
Anonymous
449 views
Why is it important to use liquids with relatively lower boiling points when using the Dumas method?
1 answer
asked by
Jen
402 views
Why do atoms display spectra?
1 answer
asked by
Jeff
273 views
I need help on a complex ion equation. I am not sure what the products are. Please help.
Fe(OH)2 (s) + NaOH(aq)-->
1 answer
asked by
Anonymous
395 views
What's the highest occupied molecular orbital of I-?
I'm really confused here, I thought you could only find for the first two
1 answer
asked by
echem
354 views
If 27.5 mL of 5.7 multiplied by 10-2 M HNO3 is added to 20.0 mL of 2.2 multiplied by 10-2 M HNO3, what is the pH of the
3 answers
asked by
Jenny
330 views
Naming compounds
SF(sub)2 would if be just sulfur fluoride same goes with SF (sub)6 Sulfur Fluoride?
4 answers
asked by
Anonymous
348 views
I havent been at school for 8 days due to somthing wrong with my heart, but the teachers gave me work. I have no clue how to do
6 answers
asked by
Help please
408 views
Why do we have these two equations:
ΔH° = ΣD (bond broken) – ΣD (bond formed) and ΔH = Σ ΔHf products - Σ ΔHf reactant
5 answers
asked by
Tom
369 views
Have I balanced this equation correctly
CN + NaOCL---OCN + NaCl
3 answers
asked by
Mel
341 views
2. [4 points] Serum cholesterol levels were monitored to investigate the effect of physical training. Prior to this training,
1 answer
asked by
Alex
387 views
[4 points] In a recent poll, 10 local students were asked how many beers they drink in a typical week. The responses, in no
1 answer
asked by
Alex
331 views
Calculate the concentration of SO2(ppm) that must be reached in polluted air (in ppm) if the dissolved gas is to produce a pH of
1 answer
asked by
Laura
397 views
How much Fe++ could be present in water containing 1 x 1e-02 M HCO3- (bicarbonate) without causing the precipitation of FeCO3
1 answer
asked by
Laura
423 views
What mass (in grams)of mercury will fit into a 2 L bottle?
M= DV V= 2L= 2,00o mL D= 13.6 g/ mL Mass= 27, 200 grams??
4 answers
asked by
Amy
409 views
In the neutralization of HCl and NaOH i was instructed to measure the temperature of the acid HCl prior to mixing the reaction
1 answer
asked by
Jane
408 views
What will be the final temperature of a 22.0 g piece of iron (Cp = 25.09 J/K • mol), initially at 25°C, if it is supplied
1 answer
asked by
Stephen
389 views
An alcohol will form an alkoxide ion when reacted with what?
1 answer
asked by
Deirdre
346 views
does oxyanion contain oxygen?
I think it contains oxide, but I'm not sure about oxygen. Thanks in advance!
1 answer
asked by
Carla
331 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 answer
asked by
Trixie
420 views
why shold you heat the evaporating dish containing the contents to fume hood. Why should the content be heated in the fume hood.
1 answer
asked by
Sarah
303 views
What is the calculated value of the partial pressure (atm) of O2 in acid mine water of pH 2.500, in which [Fe3+] = [Fe2+]?
1 answer
asked by
Laura
361 views
Ok so you have 50mL of sucrose and 977mL of buffer solution - after equilibrium the concentration of sucrose is 0.48M - what is
1 answer
asked by
Sarah
421 views
Which will produce a decrease in entropy?
dissolving sodium chloride in water dissolving oxygen in water sublimation of
1 answer
asked by
Anonymous
423 views
which produces the greatest entropy increase?
melting the solid heating the solid heating the liquid heating the gas vaporizing
2 answers
asked by
Anonymous
800 views
Calculate the temp at which DG for a reaction (with/ DH= -19.9 kJ/mol and DS= -55.5 J/k-mol) will be equal to 0.
Is the correct
1 answer
asked by
Anonymous
300 views
What is the pH of a solution in which 25 mL of .10 M NaOH is added to 15 mL of .10 M HCl?
I have calculated the amount of moles
1 answer
asked by
Hannah
335 views
If you heat a mixture of Zn and HCl,and
heat them together until all liguid has evaporated because excess HCl will be given off.
4 answers
asked by
Edina
373 views
I am having trouble with how to approach this problem. I have the solution but can't figure out how to get it.
How many moles of
1 answer
asked by
Larry
399 views
The Ksp for PbF2 is 7.1 x 10 to the(-7). The Kb for the F- anion is 1.4 x 10 to the(-11). A student weighs out 2.5 g of PbF2,
1 answer
asked by
Anmol
316 views
The Ksp for PbF2 is 7.1 x 10 to the(-7). The Kb for the F- anion is 1.4 x 10 to the(-11). A student weighs out 2.5 g of PbF2,
1 answer
asked by
Anmol
394 views
The average pH of precipitation in rural areas is 5.70. Assuming that the pH is controlled by the carbonate system, i.e., no
1 answer
asked by
Anonymous
401 views
Distinguish between efflorescent and hygroscopic substances.
1 answer
asked by
Keith
395 views
the student stopped the first careful titration when a deep pink color was obtained in the flask. On the second trial, the
1 answer
asked by
Jay
405 views
question from my previous post answered by DrBob - is this because this acts as a polyprotic acid, or because the ratio in the
1 answer
asked by
HELP
337 views
What happens to the temperature of a gas when it is compressed?
3 answers
asked by
Megan
394 views
Hi, I was just wondering how you would calculate how much gas would dissolve into 500ml of water and if there was 0.1% of the
1 answer
asked by
John C
386 views
Need a single reagent that I could use to distinguish NaI from NaNO3. NaOH, HCl, NH4Br, or Pb(NO3)2??
3 answers
asked by
Nick Bones
412 views
Is xylose a pentose or a hexose?
3 answers
asked by
Holly
367 views
Can you draw a structural formula illustrating the complete combustion of ethanol? Please...It is confusing to me!
3 answers
asked by
Stacey
411 views
If you have to write the products of the chemical reaction Fe+O*2( asterisk means subscript),how would you know the charge of Fe
1 answer
asked by
Emily
431 views
0.05 mole of HCL is added to a liter of buffer containing 0.04 mole of NH3 and 0.03 mole of NH4CL. What is the ph? Kb= 1.8X10^-5
1 answer
asked by
Cathy
410 views
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