<p>
Friend of mine says May was harder</p>
<p>The May exam was definitely more difficult. Call me biased due to sleep deprivation, but I omitted 8 questions on that test while I finished the June test with 8 minutes to spare.</p>
<p>hey guys, what were your answers to the KI + Pb(NO3)2?</p>
<p>If i remembered the situation correctly: 10 ml and .1 Molarity for both of them</p>
<p>I tried predicting the chem equation first and got: 2KI +Pb(NO3)2 —> 2KNO3 + PbI2</p>
<p>@Taberwable: Could you specify the exact question? What are we looking for?</p>
<p>There was a question that you had to use M1V1=M2V2 (titration equation)</p>
<p>What answer this you guys get?</p>
<p>I think I got 0.5 M or 0.5 mole… I don’t remember which one though</p>
<p>I don’t remember that question. However, the propane bonds question was 10, and the zinc question was 65 grams.</p>
<p>Here is a consolidated list that everyone on CC worked on.
[TypeWith.me:</a> chemistrydiscussion](<a href=“Essay Writer: Essay Writing Service | Write My Essay For Me”>Essay Writer: Essay Writing Service | Write My Essay For Me)</p>
<p>sup bro
Matching
Iron Fillings and Sulfur - Magnet
NaCl - Distillation
Blue Ink Thing - Chromotography
Solid in Solution - Filter and funnel
limestone and acid rain is a neutalization reaction
Purple vapors over solid iodine results in sublimation
C is oxidize to CO2
Chromium (IV) is reduced to Cr metal
Catalyst reduces the activation energy.
Ionization energy is removal of an electron
Isotopes table that had like 3 questions…
(2)Two of them were Ne
was one of them like, it has a -1 charge? has to be the one with 1 more electron
T/F/CE (four CEs in total)
T T for CO2 Green House + Acid Rain
T F for Lower BP at High Alt, but not true for higher pressure
T T CE for the Organic Isomer one with the C4H10 thing.
T T CE for the last one aobut polar CO2 and having polar bonds arranged in a linear fashion
F T for the endothermic question
T T CE for NaOH being a bse and producing OH- ions
T T CE Iron Mesh eing an isotope, but similar props.
F T for the Diamond/Graphite structure, but both are carbon based
F F for Sulfur better oSurface Area and Rust
F F for the S not oxidizing agent than CL , and Sulfur having more electrons than CL
FF volume something with temperature, and increase KE with increase temp (something like that)(I asked my chem tutor and he said that at constant pressure and volume is decreased, only temperature can increase/decrease average speed of molecules) –> but avg speed and KE are not the same thing so…?
T T for the Ag(NO3) + HCl precipitate (AgCl)what were the details of this quest? something that they from agcl and thl is an acid
T T for NaCl has lower freezing point than water, NaCl weighs more per mole than water
F F for CH4 is a bronsted base, because it has unshared pairs of electrons
Multiple Choice
CCl4 - tetrahedral
last q on test - heat of sublimation
Unsafe Laboratory is burning graduated cylinder
Density is not affected by temp<br>
H2O is not a strong electrolyte
I&II for the Equilibrium question
1 x 10^50 K value most likely to occur
H2 + O2 are produced, whereas HCL DOESNT<br>
The P4 balancing was 8…
VO2
0.5 mol for 2C+O2–> 2CO or whatever the reaction was…
Rb most likely to react with H20
Na isnt found in nature
555 kJ
65 grams for Zinc.
F- has the smallest atomic radius.
Cs has the least ionization energy
Cl has greatest electronegativity
Na+ and Cl- are spectators.
Ca2+ +HCO3- coefficient is 2.
1*10^-11 for H+?
HCL is pH of 2
Na+ and SO42- are most common ions what happens when Na2SO4 dissociates what are the most common product ions
1 x 10^-3 reverse reaction (inverse)
NaF highest metling point (most polar)
5 mol of ions created : Na3(PO4)2
Ionic solid is brittle and conducts electricity when in solution or melts
Indicator for relative pH detection or whatever.
C3H8 has 10 covalent bonds
O2 and O3 are allotropes.
+5 to -3 –> oxidation number change for N.
Electrons are transferred in reactions, and are radioactive decay, but not 1/3 of mass yeah it was Statement I and II
Al:S ratio: 2:3
an atom with 4s^2 4p^4 is in the oxygen family
A + B + heat -> C (increase heat/temp to shift equ to C)
elements woo? no it was 1/4 or .25 but for a diffrerent one yeah think it was .25 thenYep i think .025
2p group:3 UNPAIRED ELECTRONS
K + H2O -> K+ + OH- and H2
Half Pressure, Half Temperature > 8.0 L
22.4 L
11.2 Lith -3 oxidation is in nitrogen family
also .025 t</p>
<p>I agree with most of what altamash has said. But, for the unsafe laboratory practices, why isn’t “pouring acid onto water” the correct answer? I believe you have to add water to acid, not acid to water. I think that was the question… I think this answer is correct.</p>
<p>I could be wrong though.</p>
<p>@studyingforchem: You must add acid to water. It’s a basic safety rule.</p>
<p>Oh right! Acid to water, not water to acid. I’m so stupid. Oh well.</p>
<p>For the question that was asking about relationship of volume and pressure, and temp and average speed, isn’t that TT? Pressure increases when volume is decreased, and average speed increases as temperature increases.</p>
<p>I think the second part was about average speed, not average kinetic energy.</p>
<p>
This was definitely TF. It was something like “Pressure increases as volume decreases BECAUSE average speed of molecules increases as volume decreases.”</p>
<p>can anyone explain why blue ink thing is using chromotography? i remember my tutor once gave me something i forget that separates liquid using buret.
and does anybody remember the exact question of 65g zinc one? i got 6.5g but if it’s like what #367 says i couldnt get wrong for such easy question. Thanks</p>
<p>what do you guys think will be the cutoff for a -800?</p>
<p>
Does anyone remember what each of these two questions were asking? I know that they were both in the matching section about separating mixtures, but what was the actual description for both of these questions? Also, was the distillation choice distillation and evaporation or something like that (meaning not just distillation)? I’m worried that I may have swapped these two answers.</p>
<p>not 100% sure… the NaCl one is asking how to separate NaCl dissolved in water from its solvent. solid in solution is asking how to separate this insoluble solid with solvent.
its distillation im pretty sure</p>
<p>@IceyVeins:</p>
<p>what seriously?? lol lucky you</p>
<p>@Rorror45</p>
<p>yea we’re the same</p>
<p>it is letter e.</p>
<p>@ Chewydog</p>
<p>the i think it was the tritration question with the choices (how i remembered) </p>
<p>a. 0.030 M
b. 0.100 M
c.0.020 M
d.0.010 M
e.0.005 M</p>
<p>but i am pretty sure my answer is the one with the .5 or .050 or 0.005 M (something with the 5)</p>
<p>Should I send my score if it’s <750 >700??</p>
<p>who here took the AP chem and found this test quite “hard?”</p>