CHEMISTRY COMMUNITY

Nathan Danielsen 1G

In the C-C single bonds in cycloalkanes and cycloalkenes, the carbons are all sp3 hybridized. This means that all the carbons want to be 109.5 degrees away from each other. In cyclooctene, all the C-C single bonds are not 109.5 degrees, because if they were, the ends of the ring would overlap instea...

Nathan Danielsen 1G

When given the cell diagram for a reaction, the anode and oxidation reaction are always on the left, and the cathode and reduction reaction are always on the right. In part C of 14.37, you are given the H+ reaction on the right, and must treat it as the cathode. Even though the final answer means th...

Nathan Danielsen 1G

According to the noble gas equation, PV=nRT, pressure is the inverse of volume, all other things being held constant. Since those equations for entropy are derived from the noble gas equation, using P1/P2 will give you the correct value.

Nathan Danielsen 1G

When a reaction is efficient, all the heat produced by the reaction is used to do work. An irreversible reaction does less work because some of the heat produced by the reaction leaves the system. In a reversible reaction, all the energy produced by the reaction is used to do work, which is why they...

Nathan Danielsen 1G

Work is equal to -P*deltaV. The problem tells you that the pressure being applied to the system is 2 atm, so now you just need to find the change in volume. The volume of a cylinder is equal to the area of the base multiplied by the height. The diameter of the pump is 3, which means that the area of...

Nathan Danielsen 1G

I think you can do it like this. To find the work here you need to use the equation W=-P * deltaV. In the problem you are given the pressure, 1070 atm, so you just need to find the volume. The change in volume will be the final volume, minus the initial volume, so you will need to find the volume of...

Nathan Danielsen 1G

Whether you use Ka or Kb depends on what the problem is asking you to do. If in the equation the reactants have an acid mixing with water then you use Ka. If it is a base mixing with water, you use the Kb. If you are not given an equation, you must use your best judgement to determine whether the co...

Nathan Danielsen 1G

Trichloroacetic acid and acetic acid are structurally identical. However trichloroacetic acid has a CCl3+ attached to the acetate ion instead of a CH3+, meaning that it has 3 Cl atoms where H atoms should be. When an acid donates a proton in solution, it leaves behind a negatively charged compound. ...

Nathan Danielsen 1G

Ionic bonds are formed from the attraction between a positively charged cation, and a negatively charged anion. Water is a polar solvent, so it can dissolve polar compounds. Oxygen is more electronegative than hydrogen, so the central oxygen in a water molecule has a slight negative charge. The oxyg...

Nathan Danielsen 1G

Ka is the measure of the concentration of H3O+ ions in a solution. All acids have a Ka, but we can calculate the Ka(using the equilibrium equation) of a weak acid because some of the original acid remains in the solution, unionized. Kb is the concentration of OH- ions in a solution. An acid will not...

Nathan Danielsen 1G

When doing the calculation for Kc, you need to use pascals as the units for pressure. Since you are given the pressure values in kilopascals for the problem you need to divide all your pressure values by 100 to get those values in pascals.

Nathan Danielsen 1G

If a ligand is neutral then its oxidation number is 0. If it is an ion, then its oxidation number is the charge of the ion. The oxidation number of the central metal atom is the difference between the charge of the molecule, and the combined charge of all the ligands. If you are given the name of th...

Nathan Danielsen 1G

Lewis structures cannot tell you whether or not an atom has unpaired electrons. To figure that out, one must draw the molecular orbital. In this case, OF+ has 12 electrons, so all the orbitals are filled up until PI*2Px and PI*2Py which each get 1 electron, as they are on the same energy level, and ...

Nathan Danielsen 1G

In general, ionic bonds are stronger than covalent bonds. So the more ionic character a bond has the stronger it is.

Nathan Danielsen 1G

Writing the electron configuration of an ion is all about removing the electrons that require the least energy to remove. For Se, the 5s and 5p orbitals are further away from the nucleus than 4d. Therefore the electrons in the 5s and 5p orbitals are more weakly attracted to the nucleus than those in...

Nathan Danielsen 1G

The excess energy from the photon is translated to the kinetic energy of the ejected electron. The more excess energy, the more kinetic energy the electron has upon being ejected.

Nathan Danielsen 1G

If a photon has enough energy to remove an electron from a material then no electromagnetic radiation will be emitted. Electrons emit EM radiation when they move down energy levels, so an electron that has escaped completely will not move back down energy levels, and therefore will not emit EM radia...

CHEMISTRY COMMUNITY

Search found 17 matches

Re: final 2012 #5

Re: assigning half reactions to oxidation/reduction

Re: Entropy changes

Re: Efficiency

Re: Calculating Work

Re: Expansion of Work 8.3 Self Test

Re: Ka vs. Kb

Re: Delocalization of Negative Charges

Re: Ionic Character and Strength of Bonds

Re: Weak acids and equations

Re: Given partial pressure, calculate equilibrium constant

Re: oxidation and charge

Re: Workbook Quiz 2 Prep: #9 Which has 2 unpaired electrons?

Re: Ionic Character and Strength of Bonds

Re: Writing electron configurations for ions with d-orbitals

Re: Photoelectric Effect- Extra Energy

Re: Energy Relationships in Absorption and Emission