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Posts by kelsy

Total # Posts: 39

Chemistry
Yes. Thank you. I totally forgot to multiply the half reactions after balancing them. Lame. I appreciate the help.

Chemistry
We overlapped. Yes I got it. Thank you.

Chemistry
Ooops I left some out: 16H+ + 2MnO4- + 10 Br- ---> 5 Br2 + 2Mn 2+ + 8H2O :) Is this it???

Chemistry
I think I have it... 10e- + 16H+ + 2MnO4- + 10 Br- ---> 5 Br2 + 8H2O + 10 e- Now remove the 10e- from both sides: 16H+ + 2MnO4- + 10 Br- ---> 5 Br2 + 8H2O

Chemistry
I'm lost. I really don't see what I am missing in this.

Chemistry
No, that won't work.

Chemistry
Should I use H3O+ rather than H+?

Chemistry
Thanks on the arrow. I don't know. In acid solutions I need the H+ ions. Charges have to balance. I balanced using the oxidation states of each species. I did half reactions. Perhaps the water is messing me up.

Chemistry
I would like to check my answer to the following question: The permanganate ion oxidizes bromide in acidic conditions to form bromine, manganese(II) ion and water. Give the balanced equation of the reaction. My answer: 3e- + 8H+ (aq) + MnO4- (aq) + 2Br- (aq)  Br2 (aq...

Chemistry
Could you show me how you got it? I'm not sure what I did wrong.

Chemistry
Can you suggest a different pka or what I might have done wrong? I got a pka of 7.2 by using pKa = -log(Ka) and Ka for H2PO4- is 6.3e10^-8. I know that a pKa of 7 will yield a buffer in the range of 6.2 to 8.2. I calculated I needed 6.1 g of the NaH2PO4 and 7 ml of the 1.00M ...

Chemistry
Hmmm, ok. True. Ok I will try again. Thank you.

Chemistry
7.21

Chemistry
I need to calculate the amount of NaH2PO4 (in grams) and 1.00M NaOH solution (in ml) needed to make 250 ml of 0.20M H2PO4- at pH 8.00. My work is lengthy and involved but the answer I got was 7.00 ml of the NaOH and 0.0070 moles of the NaH2PO4 needed. Can you tell me if I am ...

Chemistry
I need to calculate the amount of NaH2PO4 (in grams) and 1.00M NaOH solution (in ml) needed to make 250 ml of 0.20M H2PO4- at pH 8.00. My work is lengthy and involved but the answer I got was 7.00 ml of the NaOH and 0.0070 moles of the NaH2PO4 needed. Can you tell me if I am ...

biology
There are several reasons that experiments with faulty designs or with inconsistent data are problematic for scientists. A person can make one of those problems if he or she were to poorly measure what they are studying. For example, someone measured the mass of a book ...

english
In which sentence are the conjunctions used correctly? A. The top award was given to neither Steve or Jim. B. Either Fred nor John knew about the accident. C. Mary enjoyed neither roller skating or ice skating. D. Neither beauty nor popularity was considered in the contest. I ...

Physics
Light travels approximately 982,080,000 ft/s, and one year has approximately 32,000,000 seconds. A light year is the distance light travels in one year. State the speed in mi/s, using scientific notation. (1 mile = 5280 feet exactly, by definition; i.e., this is not a ...

pyshc101
It sounds to me like the calming reaction would be due to her parasympathetic nervous system, as she was originally in fight or flight mode and had a sympathetic nervous system reaction.

science
What force is needed to move a 200.00 neuton chair 1.7 meter?

Algebra
x=-7 and x=-4 x+7=0 and x+4=0 (x+7)(x+4) = x^2 + 4x + 7x +28 the equation would be x^2 + 11x + 28

Science
This would be the cell membrane or in a plant cell, the cell wall.

Math
y= 587,000(0.88)^x so.. y= 587,000(0.88)^10 y=587000 x 0.278500976 y=163480.0729

English- Figurative Language
It seems to me that it is a hyperbole (exaggeration )

english
edit the following sentence with pronoun case:"the shower of sinking bricks caused he and his diving partner to race away from the collapsing seawell."

chemistry-bond energies
Octane (C8H18) is the main hydrocarbon in gasoline. Using bond energies, calculate the amount of energy produced from 2.5 kilograms of octane. I know how to do bond energies, but If someone could tell me what to do with the 2.5 kg in this case and possibly tell me what answer ...

chemistry
Are molecules with double bonds hard to break apart? if so why/why not

CHEMISTRY
How do you balance this equation? does the dot before the 6 mean something MgSO4˙6H2O = MgSO4 + H2O

geometry
State the negation of the following statement: The sun is not shining.

factor label method (chem)
The density of mercury metal is 13.6 g/mL. what is the mass of 3.55 mL of the metal? i don't know where to begin on this question

math
Tanyas heart beats 68 times per minute how many times does it beat in one hour

Chemistry
based on differences in their boiling points.

math
i need to factor 2x²-x-6

math
Find the perimeter of a right triangle with legs of 20 cm, and 21 cm. a.882 b.82 c.70 d.47 I have no clue what to do. Can somebody help me with this please?

chemistry
No Sir, thank you :)

chemistry
Hy Dr Bob222 this will be the last time I will bother you about this type of question. Can you please tell what I am doing wrong? This is the best answer I could come up with: Question: Strychnine, C21H22N2O2(aq) is a weak base but a powerful poison. Calculate the pH of a 0....

chemistry
If 1.00 mol of iodine and 0.50 mol of chlorine are initially placed into a 2.00 L reaction vessel at 25 degrees celsius, find the concentrations of all entities at equilibrium

chemistry
I get 4.0 x 10^-3 but im incorrect

math
ms.smith has a new fish aquarium that measures 45.3 cm long, 23.4 cm wide and 28 cm high. She has had a problem with the fish jumping out of the tank. today she is cleaning and decides to fill the tank to a level that is 4cm from the top to see if that will help. how mmany ...

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