Biochemistry / Actual Questions & Verified Answers, 2025 / 2026.
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 1 / 2
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
Reactants - Answer: Starting materials in a reaction
Products - Answer: Ending materials in a reaction
- / 2