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Need homework help? Can you offer homework help?

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#31 A,C, E

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#30. Solids will have no effect on our equilibrium expressions, and catalysts speed up reactions but also have no effect on our Keq.

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Scientific notation reminder. In your calculations always wrap the numbers in parenthesis, especially when dividing.

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Solids and liquids get left out of our work.

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Reactions happen faster when more collisions occur.

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Molarity = moles/Liters
*Reminder *
1000 mL = 1 L
1000 mg = 1g

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28. intermolecular forces are attractive forces, between all molecules.

56. Volatile compounds have weak forces, in volatile compounds evaporation can occur rapidly which is an endothermic process.

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Atomic means singular, do you see any elements by themselves (no subscripts)
Molecular describes compounds with all nonmetals together.
Ionic describes compounds with a metal + nonmetal.

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15.
All atoms/molecules have dispersion forces.
Dipole-dipole we need to look for polarity. Shapes that indicate polar include trigonal pyramidal and bent. Shapes that typically indicate nonpolar include trigonal planar, tetrahedral, and linear.
Hydrogen bonding is decided if hydrogen is directly connected to F, O, N.

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Water is a spherical molecule because of forces (surface tension pulling it inward to decrease the surface area.)

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Free Radicals are mentioned in #53

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#32 To sort elements by bond polarity use the chart with electronegativity values found in our notes outline. (a picture of the periodic table with bars sticking up)
CO  3.5-2.5 =1.0
HBr 2.8-2.1 = 0.7
ICl 3.0-2.5 = 0.5
H2 2.1-2.1 = 0

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#28

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To determine how many resonance structures a molecule has you need to be sketching it. How many ways are there to assemble a stable molecule?
#21A. 2 resonance structures

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#18 shows examples of central atoms that do not need an octet. Boron is fine surrounded by 6, and Nitrogen by 7 (when the total number of valence electrons is an odd number)

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Ions that are positive have lost electrons, Ions that are negative have gained electrons.

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Lewis structures for an element include the element symbol and valence electrons around it.

Ex. Sodium is in group 1A, and has 1 valence electron

Na.