Which is a characteristic of the polar water molecule?
a tetrahedral electron domain geometry with covalently bonded atoms
a tetrahedral electron domain geometry with ionically bonded atoms
a linear shape with polar covalent bonds
a linear shape with polar ionic bonds

a tetrahedral electron domain geometry with covalently bonded atoms

Explanation:

Water molecule has one central oxygen (with two lone pairs) and with two hydrogens (one on each side). Oxygen is more electronegative hence pulls electrons towards it making it partial negative and the hydrogen partial positives. Since Oxygen has four domains around it (1 domain counts for each lone pair or bond) This is a characteristic of a tetrahedral electron domain geometry with covalently bonded atoms

polar ionic would be where electrons are completely transferred but in case of water, the electrons are not completely transferred from hydrogen to oxygen rather electrons spend most time around oxygen but are still shared b/w oxygen and hydrogen

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what do the different brain waves do?

explanation:

brainwaves are produced by synchronised electrical pulses from masses of neurons communicating with each other. brainwaves are detected using sensors placed on the scalp. brainwave speed is measured in hertz (cycles per second) and they are divided into bands delineating slow, moderate, and fast waves.