Chem 203 AIDS Midterm 1

Chem 203 AIDS Midterm 1 - Picture 4 Chem 203 AIDS Midterm...

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Unformatted text preview: Picture 4 Chem 203 AIDS Midterm 1: The exam is in SGM 123. We will begin promptly at 11 am. No one will be allowed to leave the room before 11:30 am. Anyone who is more than 30 minutes late will not be allowed to start the exam. There will be 25, 4-point questions + 1 bonus question (4 points). All questions will be multiple choice. You will have 60 minutes to complete the exam. Here are some select hints for exam questions: You need to know about atoms (including the subatomic particles that make up atoms) and bonds (including strength, size, and shape). You need to know electronegativity and how that contributes to the bonds between atoms in a molecule You need to know the organic functional groups taught in lecture. You should understand stereochemistry and how to identify a chiral carbon. You should know the steps of the central dogma of biology. You should know transcription and translation. You should understand the DNA-RNA-Protein code and how to make your own code Chem 203Lg Exam 1 Review Lecture #2: Basic Organic Chemistry I Atoms Know what atoms are made of (protons+, neutrons, electrons -). Atoms are made up of a nucleus and an electron cloud. Nucleus contains protons and neutrons. The atom is held together by the negatively charged electrons being attracted to the positively charged protons = opposites attract! Know the charges and location of the subatomic particles Know how to use the periodic table to determine number of protons and electrons protons=atomic number electrons= Where are protons located in the atom? nucleus How many electrons does carbon have? 6 e-, but valence is 4 e- Chemical reactions and ionic bonds Know what and ionic bond is and what force holds it together Electrons cant be lost to nothing Electrons cant be gained from nothing Atoms that would like to lose an electron and atoms that need to gain an electron might be a good match for each other. Neutral loose an electron cation (positive charged atom) Neutral gain an electron anion (negative charged atom) Picture 1 Picture 2 Picture 5 Picture 6 Picture 7 Know the Octet Rule and how many electrons an atom would like to lose or gain Know how salts will be formed (i.e. NaCl vs. MgCl2) Ionic bonds (electrons/charge) How do unstable atoms become stable? Na+, so its a cation and wants to give away an electron to Cl Cl-, is an anion and wants to get an electrion because its proton # is 17 and thus, 2 in the inner shell, then 8, then 7 in its valence e- shell left; thus, needing 1 more electrion to become stable. Picture 3 Picture 8 Know the trend of electronegativity to the right and upwards direction (up from bottom left to top right). As it increases, how much an atom needs to gain an e- How many electrons does Mg want to lose or gain? Wants to lose 2 e- and become a cation (+ charge atom) Electronegativity decreases in what direction on the periodic table?...
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Chem 203 AIDS Midterm 1 - Picture 4 Chem 203 AIDS Midterm...

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