Atoms/Molecules & Chemistry of water Flashcards
1
Q
What chemical elements make up most matter.
A
Oxygen, Carbon, Hydrogen, Nitrogen
2
Q
Atom
A
smallest unit of an element
3
Q
Atomic number
A
= protons/electrons
4
Q
Mass number
A
= protons + neutrons
5
Q
Molecule
A
two or more atoms linked by chemical bonds
6
Q
compound
A
two or more elements in a fixed ratio
7
Q
Ionic bonds
A
two atoms of opposite charges
8
Q
Covalent bonds
A
Polar covalent: unequal sharing
Non-polar: atoms share electrons equally
9
Q
Inorganic vs organic
A
organic alway contain carbon, atoms held by covalent bonds, complex structures.
inorganic dont always contain carbon, held by ionic or covalent bonds, simpler structure
10
Q
Chemical composition of water
A
Oxygen and hydrogen, oxygen is more electronegative than hydrogen so oxygen pulls hydrogen to share its electrons
