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</p>
<p>Yes, this question was from page 27ish and I’m responding to it on page 35.</p>
<p>I’d say this was about average, not too hard (78/85 for 800, like last month) but not too easy (82/85 for 800, the released test). 80/85 would be a safe estimate.</p>
<p>Since the May 2008 test was exactly the same one (or so i keep on hearing), if anyone knows the ACTUAL ANSWERS from that test, could you post them? or a link to them?</p>
<p>mass post…</p>
<p>Does anyone remember the water question being discussed above, like what exactly was being asked? I remember that “Water is an electrolyte” is false. The dissociation constant for water is 1 x 10^-14, so it can’t be an electrolyte. &Was “water is amphoteric” really a statement? I don’t remember it >.<</p>
<p>I think 101 was T/F. It said something like “…BECAUSE…If temperature remains constant, then the average kinetic energy of the particles is greater when the volume is decreased.” Temperature IS the average kinetic energy of particles. If the temperature is constant, then the avg KE can’t be “greater,” right? Unless they mean the temperature stays constant after the volume is decreased…</p>
<p>And was the “function of temperature” question settled yet? I put density.
If anyone trusts wikipedia as a credible source they say [url=<a href=“Density - Wikipedia”>Density - Wikipedia]here[/url</a>], “In general density can be changed by changing either the pressure or the temperature. Increasing the pressure will always increase the density of a material. Increasing the temperature generally decreases the density, but there are notable exceptions to this generalisation.” So it isn’t ALWAYS a function of temperature…?</p>
<p>I got it wrong, but I’m pretty positive the CO2/Acid Rain question is TT, [url=<a href=“Acid rain - Wikipedia”>Acid rain - Wikipedia]if</a> you trust wikipedia.<a href=“&btw,%20it%20DEFINITELY%20said%20acid%20rain,%20not%20acidic%20solution,%20unless%20we%20had%20different%20tests”>/url</a> It’s not CE, because acid rain does not cause global warming…</p>
<hr>
<p>What was the answer to the Carbon forming CO2 question? Was it oxidation/reduction/sublimation or something else?</p>
<p>and for the question about electrons, are they released in nuclear rxn’s?</p>
<p>"a nd was the “function of temperature” question settled yet? I put density. "
Thats correct</p>
<p>I dont think electrons are released in nuclear reactions since nuclear reactions only involve the “nucleus”</p>
<p>Uhh… There was a question with Oxidation/Neutralization/Reduction/somethingsomething
What happens when acid rain or something reacts with limestone</p>
<p>Yes. Nuclear reactions emit e- in Beta Decay.</p>
<p>Also, I don’t think C->CO2 was a question… I don’t remember it.</p>
<p>Your temperature solution is correct.</p>
<p>Acid meets Calcium > Either oxidation or neutralization. I bet oxidation is it because that means that limestone corrodes. So there you go. I missed that question.</p>
<p>ohh. was the question about electrons about radioactive decay or nuclear reactions or something else? I can’t remember >.<</p>
<p>Acid Rain and Limestone is neutralization. Acid+Limestone (Ca(OH)2) –> H2O + etc.</p>
<p>Sorry, I meant to say: There was a question that was something like:
A) Oxidation
B) Neutralization
C) Reduction
D) Sublimation
E) Something else</p>
<p>Then they asked which of the above best describes the process in which C forms CO2? or something like that</p>
<p>A) Oxidation! I can’t believe you guys are having a discussion on that. C goes from 0 to +4.</p>
<p>When solid Carbon turns into Gas, it is known as sublimation (Solid to a Gas, no between)</p>
<p>IE: Dry Ice ._. EDIT: Wait, what the heck, cupnoodles?</p>
<p>Nuclear reactions include radioactive decay, because the decay can be written in form of a nuclear reaction
U238 -> something + beta (0, -1)</p>
<p>density, constant mass, constant volume (that was a given)</p>
<p>Carbon is NOT subliming. This is sublimation: CO2(s) -> CO2(g). This is not sublimation: C(s) + O2(g) -> CO2(g).</p>
<p>Whoa, okay, calm down. I get your point.</p>
<p>ahhh! you’re right, it’s oxidation. I changed my answer ;__;
thanks for the help</p>
<p>CO2 does not react to form acid rain. It creates H2CO3 which is not considered acid rain, but rather naturally acidic rain. Acid rain is solely sulfuric acid, I believe.</p>
<p>[Acid</a> rain - Wikipedia, the free encyclopedia](<a href=“Acid rain - Wikipedia”>Acid rain - Wikipedia)</p>
<p>when has anyone ever seen O2 collected by the dispacement of water…? H2, very commmonly, but I have never seen O2…</p>
<p>KClO3 –> KCL + O2</p>
<p>Also, I’ve seen a solubility curve for O2 and it’s pretty insoluble (meaning that it can be collected over water). </p>
<p>“It is possible to collect oxygen gas by this method as it is very slightly soluble in water.”
<a href=“http://sciencefairprojectssite.com/oxygen-from-potassium-permanganate.htm[/url]”>http://sciencefairprojectssite.com/oxygen-from-potassium-permanganate.htm</a></p>
<p>Oxygen is collected over water in this experiment procedure
<a href=“http://www.kingsborough.edu/academicDepartments/PHYSCI/science25/labs/Experiment_9_Properties_of_Oxygen.pdf[/url]”>http://www.kingsborough.edu/academicDepartments/PHYSCI/science25/labs/Experiment_9_Properties_of_Oxygen.pdf</a></p>
<p>That’s not what the question stated at all. Displacement means a reaction, such as:
K+H20–>K+ + OH- + H2. </p>
<p>Even if the term “over” was mentioned, displacement was the main part of the condition, thereby, for me at least, calling O2 into question.</p>
<p>You’re confusing chemical displacement with physical displacement. A displacement reaction is NOT the same thing as water being displaced to collect gases.</p>
<p>Look, if the gas is soluble enough it will be dissolved by water and cannot be collected in an experiment involving water. HCl is soluble in water and forms hydrochloric acid. H2 and O2 are not very soluble and hence can be collected in an experiment.</p>
<p>hm, im not saying im right, but the term diplacement in this context is quite esoteric to me. my book does not even use the term downward displacement when discussing collecting gasses over water. we’ll see, only -2 so far.</p>
<p>Still looking at a 79 raw score here…hmmph.</p>