Unit 4 - Chemistry 2024

Which of the following best describes electronegativity

• the energy associated with a gas phase atom accepting an electron

• the energy associated with a gas phase atom loosing an electron

• the energy associated with formation of an ionic crystal

• the tendency of an atom within a molecule to attract electrons

• the tendency of an atom within a molecule to attract electrons

which best-described resonance in chem

• a molecule that alternates between multiple valid lewis s

• a molecule that can exist as more than one lewis s

• a molecule that is the average of more than one lewis s

• a molecule that has more than eight electrons around any atom

• molecule that is the average of more than one lewis s

an electron is surrounded by three single bonds, one double bond, and a non bonding electron pair, the molecular geo is :

trigonal bipyramidal

perfume is sprayed = is what

diffusion

rxn associated with lattice energy of NaCl

Na+ (g) + Cl- (g) → NaCl (s)

The si unit of Pressure

Pa

know how to estimate lattice energy

know it

about bond angles

The greater the repulsion between electron pairs around a central atom, the larger the bond angle will be

Lone pairs exert a stronger repulsive force than bonding pairs, causing a smaller bond angle between bonded atoms when lone pairs are present. 

shorter bond length = stronger

know big char thing

know it

know how to do bond length stuff

know it

understand bond length energy

know it

know how to draw orbitals

know it

which is not true about kinetic molecular theory

• gas molecules move in ceaseless, random motion

• the volume of gas molecules is negligible compared to the container

• gas molecules weakly attract each other due to dispersion

• pressure is due to collision of gas molecules with the container wall

• gas molecules weakly attract each other due to dispersion

atomic mass - speed

light elements = faster speed

which statement is true

• polar covalent bonds can form when atoms have different electronegativities

• electrnegativity is the average of ionization energy and electron affinity

• Vespr is used to determine the geometry of ionic molecules

• the dipole movement of HF and HCl is the same (a measurement of the separation of two opposite electrical charges.

• polar covalent bonds can form when atoms have different electronegativities

know lewis s

know it

electronegativity chart

<0.4 = non polar

0.4-1.8 polar

>1.8 = ionic

calculate formal charge WORK ON FORMAL CHARGE

valence electrons - nonbonding electrons - bonding electrons/2 WORK ON FORMAL CHARGE

lower atomic weight =

escapes faster maybe

know hybridization

know it

understand octet rule

know it

bond energies are __ ?

average values

understand pv = nrt

know it