5 Written questions
5 Matching questions
- polar molecule
- a substance that exists before a chemical reaction starts; located on the left side of the arrow in a chemical reaction.
- b measure of the concentration of hydrogen ions (H+) in a solution.
- c center of an atom; contains neutrons and protons. In eukaryotic cells, the central membrane-bound organelle that manages cellular functions and contains DNA
- d molecule with oppositely charged regions
- e pure substance with unique properties; formed when two or more different elements combine.
5 Multiple choice questions
- specific place where a substrate binds on an enzyme.
- type of chemical bond formed when atoms share electrons.
- substance formed by a chemical reaction; located on the right side of the arrow in a chemical equation.
- particle without a charge in an atom's nucleus
- compound whose atoms are held together by covalent bonds
5 True/False questions
acid → building block of matter; contains subatomic particles—neutrons, protons, and electrons
ion → atom that is negatively or positively charged because it have lost or gained one or more electrons.
ionic bond → particle without a charge in an atom's nucleus
base → substance that releases hydrogen ions (H+) when dissolved in water; an acidic solution has a pH less than 7.
buffer → mixture that can react with an acid or a base to maintain the pH within a specific range.