ch.2 & 3 Flashcards
1
Q
unpaired valence electrons are shared by both nuclei to fill their orbitals.
A
Covalent bond
2
Q
Substances held together by covalent bonds are called
A
molecules
3
Q
Electrons are transferred from one atom to another
A
Ionic bond
4
Q
Electrons are evenly shared between
two atoms and the bond is symmetrical.
A
Nonpolar covalent bond
5
Q
Electrons are asymmetrically shared.
A
Polar covalent bond:
6
Q
An atom that loses an electron and becomes positively charged.
A
Cation
7
Q
An atom that gains an electron and becomes negatively charged
A
Anion:
8
Q
what are their opposites ?
Macromolecules
Protein
DNA/RNA
Carbohydrate
A
monomer
amino acids
nucleotides
monosaccharides
9
Q
Monomers link together (polymerize) to form ?
A
polymers
10
Q
All proteins are made from just ?
A
20 amino acid building blocks.
