| Term | Definition |
|---|
| Why are water molecules polar? | There is an uneven distribution of electrons between the oxygen and hydrogen atoms. |
| What is cohesion? | An attraction between molecules of the same substance. |
| What is adhesion? | An attraction between molecules of different substances. |
| What is a mixture? | A material composed of two or more elements or compounds that are physically mixed together but not chemically combined |
| What is an example of a mixture? | Salt and pepper stirred together |
| How are cohesion and adhesion similar? | They are attractions between molecules |
| How are cohesion and adhesion different? | Cohesion occurs between molecules of the same substance and adhesion occurs between molecules of different substances |
| Solute | The substance that is dissolved |
| Solvent | the substance in which the solute dissolves |
| suspensions | Mixtures of water and NONdissolved material |
| What does the pH scale measure? | The concentration of H+ ions in a solution |
| What is an acid? | A compound that forms H+ ions in solution |
| What is a base? | A compound that produces hydroxide ions (OH- ions) in solution |
| ____contain higher concentrations of H+ ions than pure water and have pH values below 7 | Acids |
| ___contain lower concentrations of H+ ions than pure water and have pH values above 7 | Bases (basic, or alkaline solutions) |
| ____are weak acids or bases that can react with strong acids or bases to prevent sharp, sudden changes in pH | Buffers |
| What is the difference between a solution and a suspension? | Solution--All components are evenly distributed;Suspension--undissolved particles are suspended in the mixture and can settle over time |
| ___contain higher concentrations of H+ ions than pure water and have pH values below 7 | acids (acidic solutions) |
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