Chemistry 4 questions 40 points and brianest

question 1
how are sp3 hybrid orbitals arranged around a nucleus?

two orbitals in a linear shape
one orbital in an hourglass shape
four orbitals in a tetrahedral shape
three orbitals in a trigonal planar shape

question 2
what is the three-dimensional structure of the nuclei of atoms in a molecule or polyatomic ion called?

lewis dot structure
bond length
molecular geometry
molecular formula

question 3
what is the molecular geometry of the molecule methane (ch4)?

trigonal planar
not enough information provided
tetrahedral
linear

question 4
based on the vsepr theory, what molecular shape can be predicted if a molecule has two bonding electron pairs and one lone electron pair around the central atom?

bent
linear
trigonal planar
tetrahedral

The last few miles of the marathon are the most difficult for heather, her hair plastered to her head, sweat clinging to her arms, and her legs already feeling as if they had nothing left, just dead weight. after grabbing a cup of ice water, she feels the ice cubes smash against her nose as she gulps some cool refreshment and keeps on running. in these last few miles, the breeze kicks up and she finally feels some coolness against her skin. drips of sweat, once clinging to her forehead, now spill down, and heather feels more pain as the sweat flows into her eyes.which of the following is the most likely reason why the ice struck heather’s nose when she took a drink? a) water can function as a solvent. b) water can store large amounts of heat. c) water can moderate temperatures through evaporative cooling. d) the density of water decreases when it freezes. e) water has a cohesive nature.sweat remained on heather’s forehead and arms because of the a) high salt content of sweat b) cohesive nature of water c) ability of water to moderate heat d) high evaporative cooling effect of water e) ability of water to act as a solvent