This is from physics & maths tutor
| Front | What are the sterilising agents for potable water? |
| Back | Sterilising agents used for potable water include chlorine, ozone or ultraviolet light.• Chlorine is a toxic gas so the amount added to water has to be carefully monitored.• Using ultraviolet light to kill microbes avoids adding chemicals to the water but is more expensive |
| Front | What is the radius of an atom? |
| Back | 0.1 nm |
| Front | How do you set up a general electrolysis experiment? |
| Back | Place the positive and negative electrodes in a beaker containing a molten or dissolved ionic compound- Connect both electrodes to a power supply with wires |