Thursday
May 5, 2016

# Posts by Johannie

Total # Posts: 25

calculus
Find the angle ABC, if A = (4, –3, –1), B = (0, 0, 0) and C = (–2, –3, 5) Could you lead me in the right direction I dont know where to start
June 19, 2011

Chemistry
A 500.0-mL buffer solution is 0.100 M in HNO2 and 0.150 M in KNO2. Determine whether or not each of the following additions would exceed the capacity of the buffer to neutralize it. a. 250 mg NaOH b. 350 mg KOH c. 1.25 g HBr d. 1.35 g HI Can you explain to me how to go about ...
October 31, 2010

Chemistry
A KCl solution containing 42g of KCl per 100.0 g of water is cooled from 60 C to 0 C . What will happen during cooling?
September 20, 2010

Chemistry
A KCl solution containing 42g of KCl per 100.0 g of water is cooled from 60 C to 0 C . What will happen during cooling?
September 20, 2010

Chemistry
Im still confused
September 20, 2010

Chemistry
A KCl solution containing 42g of KCl per 100.0 g of water is cooled from 60 C to 0 C . What will happen during cooling?
September 20, 2010

Chemistry
A solution containing 42 of per 100.0 of water is cooled from 60 to 0 . What will happen during cooling?
September 20, 2010

CHEM
Calculate the mass of nitrogen dissolved at room temperature in an 80L home aquarium. Assume total pressure of 1 atm and mole fraction of .78 for nitrogen
September 19, 2010

Chemistry
Calculate the mass of nitrogen dissolved at room temperature in an 80L home aquarium. Assume total pressure of 1 atm and mole fraction of .78 for nitrogen
September 19, 2010

Chem
The liquid in the stomach has a pH of approximately 2. What is the concentration of hydrogen ions in this liquid?
September 14, 2010

Chem
but when its hydrogen ions, do i use that second equation? ph+poh=14?
September 14, 2010

Chem
If the hydroxide ion concentration in a lake is 10‐10 M what is the lake’s pH?
September 14, 2010

Biology
If the hydroxide ion concentration in a lake is 10‐10 M what is the lake’s pH?
September 14, 2010

Chemistry
Formal charges are used as a bookkeeping to determine which resonance structure contribute the most to a molecules electron configuration. The resonance is sort of a measure of the stability. Is this correct?
April 11, 2010

Chemistry
for the first question, to be able to draw lewis structures correctly?
April 11, 2010

Chemistry
im just really confused on this topic, we havent gone over it in class yet and so i dont know much on it. for the first question i really dont know, but the second one im guessing that the opposite charges maybe?
April 11, 2010

Chemistry
What is the purpose in calculating formal charges? What physical forces create the three dimensional structure of a molecule?
April 11, 2010

Chemistry
so N20 is polar SO2 is polar and N3- is ionic ?
April 10, 2010

Chemistry
it tells me that it is incorrect..
April 10, 2010

Chemistry
SO2 polar N2O polar N3- non polar ?
April 10, 2010

Chemistry
SO2 polar N2O polar N3- non polar ?
April 10, 2010

Chemistry
Would the following structures be polar or nonpolar? (Not applicable if the structure is an ion. Pick "ionic" in that case). SO2 N2O N3−
April 10, 2010

science
so it would be 1/1953 = 5.12e-4 cm and then just convert that to nm?
April 1, 2010

science
One reason carbon monoxide (CO) is toxic in that it bind to the blood protein hemoglobin more strongly than oxygen does. The hemoglobin – CO bond absorbs radiation of 1953 cm–1, which are in units of wavenumbers. Wavenumber is defined as the reciprocal of wavelength...
April 1, 2010

science
One reason carbon monoxide (CO) is toxic in that it bind to the blood protein hemoglobin more strongly than oxygen does. The hemoglobin – CO bond absorbs radiation of 1953 cm–1, which are in units of wavenumbers. Wavenumber is defined as the reciprocal of wavelength...
April 1, 2010

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