Chapter 2: Life's Chemical Basis Flashcards
1
Q
What is an element?
A
a pure substance that consists only of atoms with the same number of protons
2
Q
What is the atomic number?
A
number of protons
3
Q
What is the atomic number?
A
number of protons
4
Q
what is the mass number?
A
number of protons + number of neutrons
5
Q
What is an ionic bond?
A
electron is transferred and a bond is created by the electrical attraction of opposite ions
6
Q
What is an ion?
A
Atom with a + and - charge
7
Q
What is a covalent bond?
A
bond which two atoms share one or more pairs of outer shell electrons (water molecule)
8
Q
what are polar molecules?
A
different charges on opposite sides
9
Q
What is hydrogen bonding?
A
attraction between + and - sides of water molecules
10
Q
three main characteristics of water?
A
cohesion, stabilizes temperature, high heat capacity
