Questions About: Chemistry
I'm a junior in high school.
i don't go to a public school, not even private. I take an online school (you think it would be easier right?) I've already finished my math and chemistry or the entire year and i'm now working on english.
i've failed my math class, and i'm currently failing english as well. It's difficult since i don't have a teacher that's helping me, i have a text book and the books i have to read, and my parents are no help.
i have to repeat a year or am i just going to have to repeat the class?
i don't go to a public school, not even private. I take an online school (you think it would be easier right?) I've already finished my math and chemistry or the entire year and i'm now working on english.
i've failed my math class, and i'm currently failing english as well. It's difficult since i don't have a teacher that's helping me, i have a text book and the books i have to read, and my parents are no help.
i have to repeat a year or am i just going to have to repeat the class?
Tue, 09 Mar 2010 17:07:49 GMT
A scientist is studying the rate of a reaction 2A->B and has obtained concentration measurements of A at times (t) 100, 200, 300, 1000 seconds from the beginning of the reaction. Carefully describe how they would plot a graph and use it to: a.
that the reaction is second-order with respect to A. b. determine the second-order rate constant (k) I need to do both of them and are unclear how.
that the reaction is second-order with respect to A. b. determine the second-order rate constant (k) I need to do both of them and are unclear how.
Tue, 09 Mar 2010 17:06:49 GMT
If you know how many moles of an element is present, can you find out other physical properties about the element? If so, which?
Tue, 09 Mar 2010 17:03:39 GMT
Calculate the masses of the reactants and products of the following equation.
show work. 2K(s) 2H2O(l) 2KOH (aq) H2(g) chemistry homework, i am a little confused with this so any help would be awsome! thanks.
show work. 2K(s) 2H2O(l) 2KOH (aq) H2(g) chemistry homework, i am a little confused with this so any help would be awsome! thanks.
Tue, 09 Mar 2010 17:00:58 GMT
In the introduction to this experiment it states that "the solubility of a salt in water represents the amount of solute necessary to reach a state of equilibrium between saturated solution and undissolved additional solute." Explain
Tue, 09 Mar 2010 16:59:08 GMT
I am stuck on this chemistry problem and would be incredibly appreciative if someone could help me out with an explanation and insight as to how to solve this problem, I am stumped: If a person is on Oxygen in the hospital and breaths .5 L/min, (4% of which is removed in lungs as oxygen), and has a tank with a volume of .5 L at 1,000 psi, how long will the tank last? ____Hours Please Help! Thank so Much!
Tue, 09 Mar 2010 16:35:35 GMT
1. Which of the following are true statements about the best Lewis structure that can be drawn for the H-C-N moleule ? a) There is a triple bond between the carbon and nitrogen atoms. b) There is a single bond between the carbon and the hydrogen atoms. c) There is a positive charge on the nitrogen atoms. d) There is a double bond between the carbon and nitrogen atoms. e) There are a total of ten valence electrons. 2.
of the following are true statements about the Lewis structure drawing for the [S2O8]2− ion ? HINT start with the skeleton structure S-O-O-S a) The two central oxygen atoms have a formal charge of −2. b) There is more than one contributing structure for this ion. c) Both of the sulfur atoms have a formal charge of zero. d) All the atoms in the structure have an octet of electrons. e) Six of the oxygen atoms have a formal charge of zero. 3.
of the following compounds have two or more significant contributing Lewis structures a) OF2 b) N3- c) NO2- d) IF5 e) O3 There can be more than one answer for each question
of the following are true statements about the Lewis structure drawing for the [S2O8]2− ion ? HINT start with the skeleton structure S-O-O-S a) The two central oxygen atoms have a formal charge of −2. b) There is more than one contributing structure for this ion. c) Both of the sulfur atoms have a formal charge of zero. d) All the atoms in the structure have an octet of electrons. e) Six of the oxygen atoms have a formal charge of zero. 3.
of the following compounds have two or more significant contributing Lewis structures a) OF2 b) N3- c) NO2- d) IF5 e) O3 There can be more than one answer for each question
Tue, 09 Mar 2010 16:27:08 GMT
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