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Questions (32)
Use this of velocity vs. time for two objects to answer the question.
A velocity versus time graph shows two lines sloping upward
9 answers
77 views
Why does a rechargable battery loss charge after every charge?
1 answer
215 views
titration of sodium hydroxide with tetraoxosulphate4 acid.
0 answers
424 views
Which one of the following complex ions has an optical isomer?
a. [Zn(phen)2]2+ b. [Cu(CN)4]2– c. [Co(H2O)4en]2+ d.
2 answers
926 views
How much pure calcium carbonate (100.09 g/mol) is required to produce 40.0 mL carbon dioxide gas according to the reaction used
1 answer
892 views
0.947 moles of NaC2H3O2 dissolved in 100 mL solution
1 answer
482 views
Assume that 29.7 g of Al react with HCl
according to the equation Al(s) + HCl(aq) −→ AlCl3(aq) + H2(g) at STP. How many moles
3 answers
725 views
20.0 L of methane (CH4) undergoes complete
combustion at 0.961 atm and 20◦C. How much CO2 is formed? Answer in units of L.
2 answers
838 views
Nitric acid can be produced by the reaction of
gaseous nitrogen dioxide with water. 3 NO2(g) + H2O(ℓ) −→ 2 HNO3(ℓ) +
1 answer
920 views
Assuming all volume measurements are made
at the same temperature and pressure, what volume of hydrogen gas is needed to react
1 answer
677 views
Zinc reacts with 18.0 mL of 6.00 M cold, aqueous
sulfuric acid through single replacement. a. How much zinc sulfate is produced?
1 answer
635 views
An aqueous solution contains 0.445 M ethylamine (C2H5NH2). How many mL of 0.226 M hydrochloric acid would have to be added to
1 answer
706 views
Which of the following statements describes why ion exchange of 99% SiO2 - 1% B2O3 in a salt bath of molten postassium chloride
0 answers
621 views
How to find the %(W/V) of 134mL of a 0.610 M solution of Mg(OH)2
1 answer
929 views
How much energy (in kilojoules) is released when 21.0 of ethanol vapor at 94.5 is cooled to -19.0?
1 answer
687 views
Suggest structures for C10H14O; C10H16; C10H18; C10H16O3; C10H16O2 ; C12H22O2 in the following reaction schema:
The UV/Visible
0 answers
425 views
The UV/Visible spectrum for C10H14O exhibits a at 244 nm
C10H16 + hot KMnO4 + H2SO4 → C10H16O3 C10H16O3 + Zn(Hg)/conc HCl →
0 answers
508 views
Calculate the volume of 0.200 M acetic acid and the volume of 0.100 M sodium acetate required to make 200.0 mL of a buffer
5 answers
855 views
An excess of aluminum metal is added to 200.0 mL of 0.025 M solution of CuCl2, reducing the Cu+2 ions to metallic Cu. If the
2 answers
619 views
At a certain temperature, 2.00 moles of phosphorus(V) chloride, PCl5, was placed in a 1.0 L vessel and permitted to react as
0 answers
628 views
On complete oxidation, one mole of an organic compound produced four moles of water. Which one of the following substances could
2 answers
1,320 views
im supposed to find the
slope= -EA/R = triangle y/triangle x = (y2-y1) ________/(x2-x1)____________ how do i do this? is it the
2 answers
580 views
hi im doing a post lab sheet for chem class. and im having a little trouble.
i have: temperature 12.6 C -> 285.6 K Time 816 sec
1 answer
532 views
hi im doing a post lab sheet for chem class. and im having a little trouble.
we did an experiment where we put a mixture into a
1 answer
549 views
Give the oxidation sate for the monoatomic cobalt species whose electron configuration is the following:[Ar]4s0 3d6
Is the answer
1 answer
390 views
I am reviewing my test and I having trouble figuring out the answer to the following question:
List the following element symbols
2 answers
865 views
Ammonia,is a weak base with a Ka value of 1.8x10^-5 .What is the pH of a 0.22M ammonia solution?
4 answers
875 views
You need to produce a buffer solution that has a pH of 5.08. You already have a solution that contains 10 mmol (millimoles) of
2 answers
1,119 views
Does the element sodium have properties in common with NaCl? Explain
1 answer
410 views
Which of the following subshells is correctly designated?
a. 1f5 b. 3s3 c. 6f12 d. 4d11 e. 1p2
1 answer
1,246 views
Which of the following subshells is correctly designated?
a. 1f5 b. 3s3 c. 6f12 d. 4d11 e. 1p2
1 answer
541 views
whats relationship between temp and kinetic energy
http://www.google.com/search?as_q=temperature+kinetic+energy+&hl=en&num=10&btn
0 answers
599 views
Answers (20)
A object travels at constant negative acceleration. What does the graph of the object's velocity as a function of time look like?(1 point) Responses a straight line with positive slope a straight line with positive slope a curved line decreasing from left
The graph of an object's position over time is a horizontal line and y is not equal to 0. What must be true about the object's motion?(1 point) Responses The velocity is constant and non-zero. The velocity is constant and non-zero. The acceleration is
Use the equation for motion to answer the question. x=x0+v0t+12at2 An object has a starting position of 2 m, a starting velocity of 15 m/s, and is moving at a constant speed. Which option shows the final position of the object after 1 s? (1 point)
Use the graph of velocity vs. time for an object to answer the question. An illustration shows the velocity versus time graph. The vertical axis of the graph is labeled negative at the bottom and positive at the top. A line parallel to the horizontal axis
im not to sure what phen and en are short for. but im thinking the answers maybe d) if zinc is bonded to 2 (NH3) and if en means the rest of atoms its bonded to are the same.??
Determine the mass of 3.18 ×1023 atoms Cl.
so, I guess the question is "m of AgCl produced"???
[base] > [acid] so your pH should be larger than pka. check DrBob's answer :)
10.4 grams
cadaverine is AKA pentane-1,5-diamine
Sarah, 4.70 is what you get when you do the -log (Ka)
Thank you
C3H7OH right?
he gave us an example of what the slope might be in class and it was -1.3x10^2 but my slop is completely different, was i supposed to do calculations? or just get the one from excel? what do i put in the 2 blanks?
if im missing any information, please let me know. just simple steps would be really helpful!
Thank you, I guess I got confused with Al and As :)
thanx a tons =)
ok thanks alot... the PartB asks for: What is the percent ionization of ammonia at this concentration?
sorry the 2nd question is the right one
Ammonia,is a weak base with a Kb value of 1.8x10^-5 .What is the pH of a 0.22M ammonia solution?
