| What does it mean if something is pure? | It has only one compound or element |
| How can the melting/ boiling point of a substance tell you if its pure? | It will melt or boil at a specific temperature. The closer the measured value it to the actual melting/ boiling point, the purer it is. |
| What will impurities do to the melting point of a substance? | It will lower the melting point and increase the melting range. |
| What will impurities do to the boiling point of a substance? | It will increase the boiling point and your substance may boil over a range of temperatures. |
| What are formulations? | Useful mixtures that have a purpose. Their component are presented in a measured quantity. |
| What are some formulations found in everyday life? | Fuels, cleaning products, cosmetics, fertilisers and metal alloys. |
| How can you test for chlorine? | Chlorine will bleach the damp litmus paper, and make it white. if the litmus paper is blue, it will turn red. |
| How can you test for oxygen? | If you put a glowing splint in the test tube it will relight the split. |
| How can you test for carbon dioxide? | Bubbling carbon through limewater will turn it cloudy. |
| How can you test for hydrogen? | If you hold a burning splint at a test tube there will be a squeaky pop. |
| What is chromatography? | A method used to separate substances in a mixture. |
| What is the mobile phase? | When the molecules can move. This is always a liquid or a gas. |
| What is the stationary phase? | When the molecules can't move. This can be a solid or a really thick liquid. |
| What are the steps of chromatography? | 1) Draw the base line in pencil because it's insoluble (stationary phase).
2) Draw large dots on the line in ink.
3) Lower the chromatogram into the solvent in the beaker (mobile phase).
4) Watch as the mixture separates. |
