<p>oh and thanks @dianazhao! what did you put for phenolphthalein in neutral solution? I put a pink, colorless solution forms</p>
<p>Complex ion was the copper-ammonia reaction</p>
<p>@moscow997 yeah that’s what I put too, because salt is soluble.</p>
<p>@SameerHussain There was an answer choice of a barium chloride and sulfuric acid reaction (I think). Was that an answer to anything?</p>
<p>Do you guys remember a question about 3 M HCl and 2 mol NaOH mixing. and then it asked for the final conditions or sth. and NaCl forms. was the answer to that sth like A or B? </p>
<p>The answer to the question where you heat copper wire and sulfur together was that copper loses to electrons. </p>
<p>CuS is formed in that reaction, and every answer choice listed is correct in that it would happen. However, the question asks for which cannot be experimentally observed, and while it is true that copper loses 2 electrons in the process (oxidation state from 0 to +2), that cannot be experimentally observed. Notice that every other answer choice was something that the experimenter could easily see (copper is gone, black solid, weighs more than copper wire) </p>
<p>for the one about enthalpy. you use hess’s law which is deta H of product - delta H of reactant then get -85 as the answer.</p>
<p>What is the strongest bronsted Lowry base? I put OH-</p>
<p>And what should be put into NH4Cl solution to change the ph to the same direction?</p>
<p>This test has just affirmed the fact that I am terrible at chemistry.</p>
<p>@HughHuang96824. I think the answer was C2O3- since H2CO3 is a weak acid and C2O3- is its conjugate base.The conjugate base of a weak acid is a strong base. OH- is the conjugate base of H2O, which is not considered a weak acid nor a strong acid. Does anyone agree with me or am I wrong?</p>
<p>I thought OH- was an arrhenius base?</p>
<p>I didn’t put OH- because I thought it was an Arrhenius base, but I guess it technically is a proton acceptor, in which case I’m pretty sure it’s the strongest, since all strong bases dissociate into OH-</p>
<p>@dianazhao I think OH- is both an arrhenius and bronsted lowry base because it does donate OH- to the solution and it ALSO accepts protons. I guess I overthought the question </p>
<p>Yeah, I think its OH-.</p>
<p>I do not think that C2O3 is the conjugate base of neither H2CO3 nor HCO3- since the difference between a conjugate base and acid should be an H＋ only. I chose OH- because it is a strong arrhenius base. I guess every kind of acid-base definition led to a similar result.</p>
<p>Wait… Was the question asking for Lewis base? I do not remember, but the answer should be the same.</p>
<p>@HughHuang96824 the question asked for a bronsted lowry base :)</p>
<p>is there a google doc for this?</p>
<p>What about the one with plant fertilizer? And with the emitted gas in the eudiometer?</p>