Chemistry + Water

a water molecule is composed of...

• 1 oxygen atom covalently bonded to 2 hydrogen atoms

• 2 oxygen atoms covalently bonded to 1 hydrogen atom

• 1 oxygen atom ionically bonded to 2 hydrogen atoms

• 1 oxygen atom hydrogen bonded to 2 hydrogen atoms

In a water molecule electrons are shared, but spend more time rotating around oxygen than hydrogen

• this makes the bond polar covalent

• this makes the bond nonpolar covalent

• this makes the bond ionic

• this makes a hydrogen bond

Which would water NOT be able to dissolve?

• polar molecules

• ionic compounds

• nonpolar molecules

Oil is a ____ molecule.

• polar molecules

• ionic compounds

• nonpolar molecules

Which particle allows atoms to bond with one another?

• protons

• electrons

• neutrons

• nucleus

A hydrogen atom needs __ more electron(s) to obtain a full outer shell

• 7

• 8

• 2

• 1

The number of covalent bonds an atom can make =

• the number of valence electrons it has

• the number of valence electrons it's missing to get to 8

Atoms are

• positive

• neutral

• negative

In a polar covalent bond, the atom that spends more time with the shared electrons tends to be

• slightly positive

• neutral

• slightly negative

Water has a larger volume when frozen because

• hydrogen bonds between water molecules push them apart to a max distance upon freezing

• water molecules speed up as the temperature lowers, causing them to bounce and spread apart

• the hydrogen bonds between water molecules break apart and the individual molecules spread apart