| A | B |
|---|
| Energy levels | Regions where the lectrions trovel about the nucleus |
| Covalent bond | When atoms combine by sharing electrons |
| Molecule | Combination of two or more atoms joined by a covalent bond |
| Elements | Substances composed of only one type of atom |
| Compound | Substance composed of two or more atoms of different elements joined by a chemical bond |
| Ionic bond | Force of attraction between ions |
| Chemical formula | A group of symbols that show the number and kind of each atom in a compound |
| Solutions | Mixtures that are the same throughout but have variable compositions |
| Acid | A solution that has greater concentration of hydrogen ions than hydroxide ions |
| Base | Solution that has a greater concentration of hydroxide ions over hydrogen ions |
| PH Scale | The concentration of hydrogen ions in solutions is indicated by this set of numbers |
| Isomers | Organic molcules that have the same chemical formula but different structural formulas |
| Carbohydrates | An organic compound often represented in the form of sugar and starches |
| Lipids | Organic compounds often represented in the form of fats |
| Proteins | Organic compounds often represented in the form feathers, spider webs, wool, silk, meat, etc. |
| Amino acid | Single compound that is the building block of protein |
| Nucleic acids | Fourth class of biological compounds; DNA and RNA |
| Potential Energy | The energy of position; stored energy |
| Kinetic energy | Energy of motion |
| Activation energy | Minimum amount of energy required to start a chemical reaction |
