Need help FAST! got a chem test in a couple hours!?
in which at 298 K ΔHrxn∘ = −2256 kJ ΔSrxn∘ = −549.1 J/K (change this to -0.5491 kJ/K) Part A What is the standard Gibbs free energy for this reaction? Assume the commonly used standard reference temperature of 298 K. Use ΔG = ΔH - TΔS note that ΔS is negative so the term (-TΔS) will be positive I get -2092 kJ Part B What is the Gibbs free energy for this reaction at 4717K ? Assume that ΔH and ΔS do not change with temperature. same equation as above, just change T I get +334 kJ Part C At what temperature, Teq, do the forward and reverse corrosion reactions occur in equilibrium? set ΔG to 0 and solve for T I get 4109 K
Chemistry help, fast?
(1)... you are actually correct, but I suspect that the answer being sought is (C) - ionic, as the compound titanium(IV) bromide, TiBr4, notionally has Ti^4+ cations and Br^- anions. In fact, its melting point of ~ 40 °C and boiling point of 230 °C indicate that TiBr4 is essentially molecular in nature, with Ti-Br covalent bonds. As the electronegative of Ti is 1.54 and the electronegativity of Br is 2.96, the Ti-Br bond is predicted to be covalent with a high degree of polarity. As a rule of thumb, cases where the electronegativity difference is less than 1.5 (as is the case here: 2.96 - 1.54 = 1.42, which is an overestimate given the high oxidation state of titanium) are classified as covalent rather than ionic. (Note: The data used in this answer is from Wikipedia, but the explanation is not.) (2)... XeBr4 is a square planar molecule - Xe in the centre of the square, Br atoms at the four corners, with two lone pair of electons on the Xe, one above the XeBr4 plane, the other below, and the Xe to lone pair directions are normal to the XeBr4 plane. The geometry of the six electron groups is octahedral about the Xe atom. It is very similar to xenon tetrafluoride, XeF4, illustrated in the Wikipedia link below. XeBr4 can be drawn (within Yahoo! Answers) as follows - bearing in mind that the Br - Xe - Br bond angles are 90° for adjacent Br atoms, even though that is hard to draw here unless you leave out the lone pairs: With lone pairs... ·· ·· : Br Br : ·· \ / ·· \ ·· / Xe / ·· \ ·· / \ ·· : Br Br : ·· ·· Without lone pairs... Br | Br − Xe − Br | Br
Do you need to fast for blood tests?
It depends on what the blood test is for. I had to fast when I was getting blood work done to see if I was hypoglycemic. Your doctor will let you know of any special instructions before the test is done.
I have one day to pass a drug test HELP?
I have to pass a drug screen every week. I smoke once or twice a week and i smoke a lot every time i do smoke. All that i do is drink about six glasses of water/cranberry juice and use the restroom a couple of times before leaving. If you dilute your urine enough your cool. If you have to do a mouth swab for your jobs, which is common you should be fine. I and a few ppl i know have passed these test easily as long as you havent smoked within 24-48 hours. Most of the time you have to be eighteen to buy drinks that cleanse your system. & Your job cannot tell your parents even if youre underage you'll just not get the job.
Blood Glucose fasting test: I fasted for 18 hours. Will my results still be accurate?
My Doctor ordered a blood glucose fasting test for me a couple of days ago. 3 months ago, I was diagnosed with Pre-diabetes, or "Insulin Resistant". I can't remember how long I fasted for last time. At least 12 hours. This time, I ate my last meal and had my last coffee at 7:00pm. I was just so tired and exhausted. I had my blood taken at 1:00pm today. That means I have fasted for 18 hours. It was not on purpose and I drank alot of water. In addition to the Fasting Glucose test, I also had blood taken for full blood count, liver, kidney, iron studies, and cholesterol. My question is: Will all of my blood test results still be accurate, having fasted for 18 hours? They say not to fast any more than 12 hours. I'd like to know what you think.
Chemistry help for few chem problems!?
I have a couple of chemistry questions I need help on. Please explain too! It's pretty simple but I get really confused with some things haha. Here they are 1. What is the wavelength of sound waves having a frequency of 256 sec^-1. at 20 Degrees C? (Speed of sound = 340 m/sec) 2. For each of the following wavelengths of visible light, determine the frequency and identify the region of the electromagnetic spectrum to which it belongs. a. 2.0x10^-14 meter b. 4.0x10^-9 c. 6.0x10^-7 meter d. 1.00 meter 3.Use Plank's constant (6.63 x 10^-34 J sec) to determine the energy which corresponds to the following frequencies of the values by 6.022 x 10^23 photons/mole. a. 4.567x10^14 hertz b. 6.165x10^14 hertz c. 6.905 x10^14 hertz d. 7.307x10^14 hertz e. 7.550x10^14 hertz Best answer and simple explanation will get 10 points :) Please no rude comments. Thank you