June 2009 - Chemistry

<p>I can’t remember the exact reaction, but H20 (l) was formed, so that doesn’t dissociate when writing the net ionic equation. Only Na+ and Cl- were the same on both sides, so they didn’t change during the reaction, making them spectator ions.</p>

<p>101 one was TTCE.</p>

<p>sorry for retouching, but the final answer for the ‘2p orbitals’ is what? 3 or 6?</p>

<p>yay :slight_smile: and the covalent bonds was it 3</p>

<p>in the beginning, the one about the oxidation state change of Nitrogen?</p>

<p>I was confused, because in NO3- isn’t it’s state 7+? </p>

<p>I ended up puting +1 -> -1 just because I saw that it gained two electrons.</p>

<p>3 UNPAIRED electrons. I misunderstood as just electrons.</p>

<p>No, I believe 101 was T/F because the speed doesn’t increase; the collision frequency only increases because of the reduced volume.</p>

<p>which question was the covalent bond one?</p>

<p>for the oxidation was it something like +5 to -3?</p>

<p>Nitrogen went from +5 to -3 </p>

<p>NO3 -, +5 - 6 = -1
NH4+, +4 - 3 = +1</p>

<p>what was the answer to the covalent bonds was it 3
and how about the temperture question?
I put density but was tempted to put deviation from ideal gas, but remembered that only HIGH temperture gases can be ideal gases so density just had to be the answer.</p>

<p>If 101 is the one I’m thinking over</p>

<p>I. Pressure increase = volume decrease (true because of Boyle)
because
II. Lower volume = faster speed (false, speed is proportional to T not V)</p>

<p>Propane has 10 covalent bonds</p>

<p>Low temp = unideal gases, so temp definitely affects the deviation from ideal gas</p>

<p>yea but D=MP/RT so density is a function of temperature</p>

<p>what was the answer to the covalent bonds was it 3</p>

<p>was Rb the most reactive with water? i guessed that from common sense but i dunno if thats right</p>

<p>i think density was the best answer
cuz ideal gas laws is definetley related to temperature</p>

<p>what is exactly question 101 about? how come so many people get confused over this question?
and what is the ‘covalent bonds’ question that shaheruddin is talking about?</p>

<p>yea, Rb is the most reactive compared to the rest</p>

<p>Yeah; Rb is an alkali metal.</p>

<p>Also, what covalent bond problem are you talking about? The one in the beginning had 10 bonds.</p>

<p>and PV=NRT is the ideal gas law formula which includes tempertture
so density has to be the answer</p>

<p>Is this the temp question?</p>

<p>Which isn’t affected by T

  • avg kinetic energy
  • deviation from ideal gas behavior
  • pressure
  • volume
  • density</p>