When molecules are close together and are slightly attracted to oppositely charged near by regions of another molecule it is called?
Van der Waals Force
100
The e- in the outermost energy level or an atom are called __?__
valence e-
100
compound the produces OH- ions in solution and is above pH 7 is called a_________
base
100
The type of bonding in which e- are transferred from one atom to another
ionic
100
The memory device used to determine if one substance will dissolve in another is: __?__
This means that _?_ dissolves polar and __?__ dissolves non-polar.
"Like dissolves like"; polar; non-polar
200
_______ _________ involve the breaking or forming of chemical bonds.
chemical reactions
200
________ produce H+ ions in solution and range from pH of 1-6.
Acids
200
The property of water that causes water molecules to be attracted to other water molecules: __?__
cohesion
200
A term used to describe 2 or more atoms that are covalently bonded together
molecule
200
______are weak acids or bases that can react with strong acids or bases to prevent sudden changes in pH.
Buffers
300
Atoms that gain or lose e- are called __?__
ions
300
pH 7 is __________
Neutral
300
Water resists changes in temperature. It takes a long time for it to heat up and a long time for it to cool down. This is because the energy is stored up in the hydrogen bonds. The term that describes this property is __?__
high specific heat
300
The pH scale ranges from _?_ to _?_. Each step up (or down) the scale is a 10-fold difference in the number of __?__ ions in the solution.
0-14; H+
300
a bond that shares electrons is a _______ bond
covalent
400
Atoms are neutral (have no charge) because the # of __?__ = the # of _____
p+, e-
400
An atom with the same number of protons but a different number of neutrons is called a(n):_?__
isotope
400
the substance that dissolves is called the __?__.
solute
400
The property of water that causes water molecules to be attracted to other substances (like xylem or glass): __?__
adhesion
400
how do you find the # of neutrons?
Mass # - atomic #
500
The number of __?__ determines the element; this number has the formal name of __?__
p+; Atomic Number
500
___________ are elements that are bonded together.
Compounds
500
The oxygen and hydrogen in water share their electrons unequally.
This makes water a __?__ molecule.
polar
500
Type of bonds between water molecules?
Hydrogen
500
What is an isotope?
has a different # of neutrons (but always has the same # of protons!)