Recent Homework Questions About Substance Abuse
I think you mean "methane"? If it is... Methane's chemical formula is CH4. To get the moles of methane, we first get its molar mass by adding the masses of C and H. There are C atoms and 4 H atom: CH4 = 12 + 4*1 = 16 g/mol Then we divide the given mass by the ...
Monday, August 12, 2013 at 8:03pm
A radioactive substance decays from 2.0kg to 1.6kg in 156 days. How long would it take to decay to 1.1kg?
Wednesday, August 7, 2013 at 9:46am
A radioactive substance decays from 2.0kg to 1.6kg in 156 days. How much will be left after 201 days?
Wednesday, August 7, 2013 at 9:45am
A radioactive substance decays from 2.0kg to 1.6kg in 156 days. What is the decay constant and the half life of the substance?
Tuesday, August 6, 2013 at 11:28pm
Oxidation is the loss of electrons and the substance oxidized is the reducing agent. Reduction is the gain of electrons and the substance reduced is the oxidizing agent. For example, look at answer A. Cl in HOCl has oxidation state of +1. It goes to Cl^- on the right where it ...
Tuesday, July 30, 2013 at 10:56pm
Oxidation is the loss of electrons; that substance is the reducing agent. Reduction is the gain of electrons; that substance is the oxidizing agent.
Friday, July 26, 2013 at 11:21am
Two bars of identical mass are at 30 °C. One is made from glass and the other from another substance. The specific heat capacity of glass is 840 J/(kg · C°). When identical amounts of heat are supplied to each, the glass bar reaches a temperature of 95 °C, ...
Thursday, July 25, 2013 at 1:59pm
a substance was found to have a renal clearance that was lower than the glomerular filtration rate. In reguards to this substance what major processes of urine formation are certain to have occured. Explain 3 major urine formation processes either occurred or not
Tuesday, July 23, 2013 at 4:55pm
Okay guys, this problem is really bugging me. I initially saw it and declined to try and solve it. However, after Nancy reposted the question, I thought that I would see if I could take a stab at it. I did back calculations and obtained 0.55 moles, but I could not figure out ...
Tuesday, July 23, 2013 at 1:52am
The size, mass, and arrangement of atoms affect the density of a substance. If a substance has a low density, what can you guess about the size, mass and arrangement of the atoms that make up that substance?
Tuesday, July 16, 2013 at 8:46pm
Sunday, July 14, 2013 at 6:58am
Will you please check my answers? 1. Single-celled organisms that do not have a membrane-bound nucleus are called A. organelles. B. prokaryotes. C. Golgi bodies. D. eukaryotes. 2. In cells, a form of active transport is A. a sodium-potassium pump. B. osmosis. C. facilitated ...
Friday, July 12, 2013 at 6:40pm
a substance going into solution has no effect on the weight the weight of the solution is the weight of the solvent plus the weight of the solute
Monday, July 8, 2013 at 10:01am
1.The psychology of children coping with sexual abuse 2.Adolescents who commit suicide 3.Self-inflicted pain as a response to grief/abuse Throughout the years, many young women have always struggled for freedom to deal with the problems they have. Such difficulties, including ...
Friday, July 5, 2013 at 8:27pm
1.)The silica that makes up the stationary phase in TLC chromatophraphy is more polar than the mobile phase. What then might the relative positions of the analgesics on the developed TLC plate tell you about the polarity of these molecules? Does this match the expectations ...
Monday, July 1, 2013 at 10:33am
The half-life for the second-order reaction of a substance A is 58.2 s when A0 = 0.63 mol L-1 Calculate the time needed for the concentration of A to decrease to the following values. (a) one-third of its original value (b) one-sixth of its original value (c) one-seventh of ...
Friday, June 28, 2013 at 4:30pm
A researchr assistant made 160mg of a radioactive, and found that there was only 20mg left after 45hours. a) What is the half-life of this substance? b) Write a function to represent the amount of substance left after x hours c) If the researcher kew he needed 100mg of the ...
Sunday, June 23, 2013 at 12:30pm
A total charge of 96.5 kC is passed through an electrolytic cell. Determine the quantity of substance produced in each of the following cases. (a) the mass (in grams) of silver metal from a silver nitrate solution (b) the volume (in liters at 273 K and 1.00 atm) of chlorine ...
Friday, June 21, 2013 at 8:59pm
SECOND the illigal drugs causes the gang violence because it identifies tha a number of factors that put youth at risk of gang involvement is poverty, school failure, substance abuse, family dysfunction, and domestic and societal violence. Illegal drugs are very harmful ...
Tuesday, March 23, 2010 at 12:23pm