What does the atomic number tell you?
number of protons and electrons
How do you determine the number of neutrons?
of protons - atomic mass
A chemical bond where atoms share one or more pairs of electrons
Covalent
A chemical bond where opposites attract
Ionic
Covalent bond where electrons are shared equally
non-polar
Covalent bond where electrons are shared unequally
polar
The ability of an atom to attract electrons toward itself in a chemical bond is called
electronegativity
Water is an example of a _____ covalent bond
polar
Water is a ______, which allows it to dissolve a great number of substances
solvent
The ability of water molecules to cling to each other is called:
cohesion
The ability of water molecules to cling to other polar surfaces is called:
Adhesion
_____ are substances that dissociate in water, releasing hydrogen atoms (H+)
Acids
____ lower the hydrogen ion concentration in a solution and thus raise the pH numerically.
Bases
A pH below 7 is a ____ solution
acidic because the hydrogen concentration is greater than the hydroxide
A pH above 7 is a ____ solution
Basic, because the hydroxide concentration is greater than the hydrogen
If you place the corner of a paper towel into a droplet of water, the water moves into the paper towel. what would explain the movement of the water?
Cohesion and adhesion
True or false: The hydrogen atoms are more electronegative than the oxygen atom.
False
True or false: An ion has the same number of electrons as a nonionic atom of the same element.
F
