Recent Homework Questions About Chemistry
The dosage of technetium-99m for a lung scan is 20 μCi/kg of body weight: Suppose a person absorbed 52mrads of alpha radiation. What would be the dose equivalent in mrems?
Friday, December 6, 2013 at 12:52pm
What volume of 5% vinegar solution is needed to neutralize 1.0g of baking soda if density is 1.01g/ml
Friday, December 6, 2013 at 11:55am
How does the C horizon form? A) color and chemistry B) texture and pure space C) decayed organic matter D) oil
Friday, December 6, 2013 at 9:33am
An aqueous solution containing 17.1 g of an unknown molecular compound ( nonelectrolyte) in 105.0g of water was found to have a freezing point of -1.8 degrees Celsius. What is the molar mass of the unknown compound?
Friday, December 6, 2013 at 4:35am
A reaction is first order in A. If the rate constant of the reaction is 3.45x10^-3 s-1, what is the half life of the reaction? a. 4.98x10^-3 s b. 200 s c. 3.45x10^-3 s d. 100 s e. 1.73x10^-3 s
Friday, December 6, 2013 at 1:17am
The half-life (t1/2) of a first order reaction is 0.100 s. What is the rate constant? a. 6.93 s-1 b. 0.693 s-1 c. 0.0693 s-1 d. 0.144 s-1 e. 3.01 s-1
Friday, December 6, 2013 at 1:14am
K+(aq) + Al3+(aq) + 2SO42-(aq) + 2H2O(l)→KAl (SO4)2 * 12H2O(s) Al is limiting and 1.007 g Find the theoretical yield and percent yield I think the answer is 17 and 40, respect. I just need help figuring it out
Thursday, December 5, 2013 at 11:20pm
Hello ellie again. I am still having trouble understanding bombardment. The question I'm working on says Complete the bombardment reaction ? + 40-18Ar → 43-19K + 1-1H
Thursday, December 5, 2013 at 10:34pm
20 uCi = 0.020 mCi 0.020 mCi/kg x 65 kg = ? mCi.
Thursday, December 5, 2013 at 10:21pm
This is a new one on me. If carbon phosphate exists I expect it would be covalent. What is the formula for this compound. Perhaps that will shed some light.
Thursday, December 5, 2013 at 9:05pm
Since we can't do subscripts and superscripts as we would like I do these so that the first number is the atomic number followed by the symbol of the element followed by the mass number. For example, 26Co60 is Co (element 26) with a mass number of 60. A positron is a ...
Thursday, December 5, 2013 at 5:08pm
Thursday, April 4, 2013 at 9:34pm
Mech. #3 The original and mech. #3 are both 2nd order and have the same rate law. Rate law= k[NO]^2[H2]
Tuesday, March 5, 2013 at 8:47pm
To the person who posted this question, did you get the right answer? I'm looking for the right answer as well. I'm assuming you were in CHMC11. Did you get the right answer in the quiz/midterm/final? Thanks!
Monday, October 8, 2012 at 10:24pm
Saturday, July 21, 2012 at 11:18pm
I want to know that too ^ That always stumps me on the hw!
Friday, March 9, 2012 at 8:06pm
Friday, November 11, 2011 at 12:09pm