Module 9 Flashcards
What is the VSEPR theory?
Molecules will attain whatever shape that keeps the valence electrons of the central atom as far apart from another as possible.
What does VSEPR stand for?
Valence Shell Electron Pair Repulsion
Tetrahedron
Four bonds- 109 degrees
Pyramidal
3 bonds- 107 degrees
Bent
2 bonds@ 105 degrees
Trigonal
3 bonds@ 120 degrees
Linear
Only 2 atoms OR two groups of electrons around the central atom@ 180 degrees
Purely covalent bond
A covalent bond in which the electrons are shared equally between the atoms involved.
Polar bond
A covalent bond in which the electrons are shared unequally between the atoms involved.
Purely covalent
Same atoms, no electrical charge OR polar bonds of equal strength that pull in opposite directions.
Polar covalent
A molecule that has polar bonds that either do not have equal strength or do not pull in opposite directions.
Polar covalent compounds can dissolve what and why?
Other polar covalent compounds and ionic compounds. Both types of compounds contain electrical charge.
Purely covalent compounds can dissolve what and why?
Only other purely covalent compounds. No electrical charges can be present.
Why do the bond angles change in different shapes that have the same number of electron groups?
Non bonding electron pairs tend to push a little harder than bonding pairs.
Why does soap help wash away stains water itself cannot wash away?
On one end of the soap molecule it is purely covalent and on the other end it is polar covalent.
