gcse chemistry
| Front | how can bacteria be used as an alternative metal extraction method? how does it work? |
| Back | bacterial extraction: some bacteria absorb metal compounds. these bacteria produce solutions called leachates containing the metals. scap iron can be used to remove the metal from the leachate |
| Front | what is a sacrificial protection? how does it prevent corrosion? |
| Back | sacrificial protection is protecting a metal from corosion by coating it with a more reactive metal the more reactive metal will corrode first, preventing corrosion of the inner metal |
| Front | describe the trend of reactivity of the halogens. how does this affect the rate of reaction? |
| Back | reactivity decreases down the group rate of reaction also decreases down the group |