<p>hmmm. are you sure ionic is stronger than covalent?</p>
<p>in fact on a practice test i took, i could have sworn it said covalent bonds are usually stronger than ionic (cuz ionics dissociate)</p>
<p>i wasnt sure on this. maybe it all depends, and can't be a straight answer.</p>
<p>finally, then im going to be bed</p>
<p>explain lattice energy (cuz i cant :))</p>
<p>it really depends doesn't it?
lattice energy : energy to dissociate and bond and melt it into liquid and reform it into a solid i think</p>
<p>Hmmm... can you please explain how the bond strenghts "depend"? I don't understand why the strongest ionic could be stronger than the weakest covalent. Or am I confusing between intermolecular and intramolecular?</p>
<p>o, sorry, i confused what the test question asked and what i am talking about.</p>
<p>i was talking about intermolecular forces (cracks open book..)</p>
<p>ok: weakest are van der waals, then hydrogen bonding</p>
<p>then GENERALLY, covalent bonding (as found in network covalents and mettalic crystals) are stronger than ionic bonding. but its general, cuz different crystals in each group have different properties.</p>
<p>and the book says lattice enery is like the ''intermolecular'' bonding of ionic crystals.</p>
<p>now, intramolecullary (sp?), whats stronger, ionic or covalent????</p>
<p>actually, you know what? i dont think i understnad what the book is saying. unless the ionic crystals are held by ''lattice enery attractions'' which count as ionic intermolecular bonding. ahhh, whatever. im gunna go to sleep. you guys can figure it out.</p>
<p>intramolecularly, ionic bonds are slightly weaker than covalent bonds. I think the general rule is that the smaller the electronegativity difference, the stronger the intramolecular bond.</p>
<p>lol good night.</p>
<p>Good night everyone. I hope someone clarifies lattice energy. Bye :)</p>
<p>Van der Waal's forces are ONLY London Dispersion Forces.</p>
<p>Lattice energy is the energy when gaseous ions form an ionic solid.</p>
<p>How do you plot a 2nd order reaction such that the graph will be linear?</p>
<p>Uhh, pretty sure Vand der waals is london and dipole-dipole. At least thats what i was taught and what the text says.</p>
<p>@nd order: time versus 1/concentration. i believe.</p>
<p>GAH! Practice AP Exam tomorrow... anyone have the 2002 or 1999 AP chem MC???</p>
<p>i have 1999 and will post some hard ones(I think as hard).</p>
<p>C2H4+3O2 -> 2CO2 + 2H2O(g)
For the reaction delta H is -1323 KJ. What is the value of delta H if the conmbustion produced liquid water instead of gas? (delta H for H2O(g) -> H2O(l) is -44KJ)</p>
<p>-1367 (?) can you give me some choices?</p>
<p>oh sorry it's -44KJ/mol</p>
<p>-1411 Kj ??</p>
<p>yeah
-1323-88=-1411</p>
<p>Nice... some more please when you feel like it.</p>
<p>which is the most ideal liquids?
C8H8 H20
CH3CH2CH2OH H2O
Ch3CH2CH@OH C8H18
C6H14 C8H18
H2SO4 H2O</p>
<p>hold on... i don't really understand what they mean by "the most ideal liquids" and what symbol is between the hydrocarbon/organic functional groups and Water/hydrocarbon. does the H2O at the end means that they are not anhydrides??</p>
<p>according to rauolts law. don't be intimidated by the questions I give you. I only give you the hard ones.</p>