Recent Tutoring Session Reviews
"We reviewed naming compounds of monoatomic ions and polyatomic ions. We then went through a worksheet on this practicing rules until the student was able to do it on her own easily. I then gave her some practice problems before ending the session."
"We reviewed for the student's chemistry exam on Friday. We went over the study guide provided to her last week, covering electron shells and orbitals and emissions spectra. She grasped these subjects well. We also covered some material on her study guide that had not been introduced by her teacher. This material included Avogadro's number and the concept of moles (not the small furry mammal but the number used to measure the quantity of atoms/molecules present). We then expanded this concept to cover molarity, as used to measure the concentration of a solution. She found these concepts difficult at first, but improved with a little practice. The greatest area of difficulty was with polyatomic ions and ionic compounds. Polyatomic ions (e.g. nitrate and carbonate) are a concept that beginning chemistry students often have problems with. Unfortunately, the only real way to recognize them is through memorization. I did not see any scores to note progress, but the student's grasp of content is excellent for only a few months into her first semester of chemistry."
"We went over basic word problem skills and recognizing conversion factors, balancing chemical equations, and stoichiometry."
"We worked on a review packet in anticipation of a test tomorrow in honors chemistry. We discussed quantum numbers and trends (electronegativity, ionization energy, electron affinity, and atomic radii). We then worked on half lives and discussed logarithms and how they can be used for example to solve At = Ao(1/2)^n by taking the logarithm of both sides. We also discussed different forms of fission, namely beta decay, positron emission, electron capture, and alpha emission."
"We reviewed molar mass, conversions using molar mass and molar ratios, converting from moles to molecules, and metric prefixes. The student began learning about solubility, so we discussed terminology and polarity and how "like dissolves like," meaning non/polar solvents dissolve non/polar solutes."
"Topics discussed: -Reviewed similar materials from last session for test on Thursday. -Intermolecular and intramolecular forces. -IMFs (London dispersion forces, dipole-dipole, hydrogen bonding) and how they affect boiling. Stronger IMFs require more energy to vaporize/boil (higher temperature). -The increase in molecular mass and London dispersion forces will increase the boiling point. -Vapor pressure of a liquid. When this pressure equals atmospheric pressure, the liquid has reached its boiling point. Raising atmospheric pressure increases boiling temp, and lowering atmospheric pressure decreases boiling temp. -Other types of phase changes-- melting/freezing, sublimation/deposition, and vaporization/condensation."