ACS BIOCHEMISTRY EXAM UPDATE 2023&2024
GRADED A+ 100% ACCURATE
Matter - ANSWER: Anything that has mass and/or takes up space (volume)
Element - ANSWER: A substance that cannot be broken down into other substances
by chemical reactions
Molecule - ANSWER: Any combination of atoms
Compound - ANSWER: Two or more different elements combined in a fixed ratio
Atom - ANSWER: Smallest unit of matter that retains the properties of an element
Atomic Number - ANSWER: Number of protons
Mass Number - ANSWER: Number of protons plus neutrons
Atomic Weight - ANSWER: 1 mole of a sustance = atomic weight in grams
Isotope - ANSWER: Atom with an abnormal number of neutrons
Proton - ANSWER: Positively charged subatomic particle
Neutron - ANSWER: Subatomic particle with no charge
Electron - ANSWER: Negatively charged subatomic particle
Valence Electron - ANSWER: Outermost electrons in an atom
Covalent Bond - ANSWER: Sharing of electrons (Two non-metals)
Ionic Bond - ANSWER: Electrostatic attraction of positive and negative ions (Metal
and Non-metal)
Valence shell - ANSWER: An atom's outermost electron shell
Polar Covalent Bond - ANSWER: Unequal sharing of electrons due to difference in
electronegativity
Cation - ANSWER: Positively charged ion
Anion - ANSWER: Negatively charged ion
Hydrogen bond - ANSWER: Hydrogen atom covalently bonded to an electronegative
atoms is attracted to another electronegative atom
GRADED A+ 100% ACCURATE
Matter - ANSWER: Anything that has mass and/or takes up space (volume)
Element - ANSWER: A substance that cannot be broken down into other substances
by chemical reactions
Molecule - ANSWER: Any combination of atoms
Compound - ANSWER: Two or more different elements combined in a fixed ratio
Atom - ANSWER: Smallest unit of matter that retains the properties of an element
Atomic Number - ANSWER: Number of protons
Mass Number - ANSWER: Number of protons plus neutrons
Atomic Weight - ANSWER: 1 mole of a sustance = atomic weight in grams
Isotope - ANSWER: Atom with an abnormal number of neutrons
Proton - ANSWER: Positively charged subatomic particle
Neutron - ANSWER: Subatomic particle with no charge
Electron - ANSWER: Negatively charged subatomic particle
Valence Electron - ANSWER: Outermost electrons in an atom
Covalent Bond - ANSWER: Sharing of electrons (Two non-metals)
Ionic Bond - ANSWER: Electrostatic attraction of positive and negative ions (Metal
and Non-metal)
Valence shell - ANSWER: An atom's outermost electron shell
Polar Covalent Bond - ANSWER: Unequal sharing of electrons due to difference in
electronegativity
Cation - ANSWER: Positively charged ion
Anion - ANSWER: Negatively charged ion
Hydrogen bond - ANSWER: Hydrogen atom covalently bonded to an electronegative
atoms is attracted to another electronegative atom
