Lesson 6 ·Class 9 · Aids to Health · Sort Lab
Antiseptics and Disinfectants
Both kill germs — but not in the same place.
Sort each item by where it may safely be used.
Sorted 0/8
All items sorted — check each bin.
VS
Free play — sort every item into the bin it belongs in; each correct drop tells you why. Switch to when you're ready to test yourself.
The difference is strength, not chemistry. The same substance diluted can be an antiseptic and concentrated a disinfectant.
What this lesson covers
Challenges to clear
- Sort every item.
- Fill the Disinfectant column — the chemicals too strong for living tissue.
The task
Sort each item by where it may safely be used.
What this lesson covers
- Antiseptic — Safe on living tissue: Mild enough to be applied to skin and wounds (It must kill germs without destroying your own cells.); Dettol and savlon (Commonly used on cuts and grazes.); Tincture of iodine (Applied to a wound before dressing it.); Methylated spirit used to swab skin before an injection (It sterilises the skin surface without harming it.)
- Disinfectant — Non-living surfaces only: Too strong for the body; used on floors, drains and instruments (It would damage living tissue badly.); Phenol and cresol (Strong enough to be corrosive to skin.); Bleaching powder used in drains and water tanks (Effective, but never applied to the body.); Formalin used to fumigate a room (It is toxic and irritant — for spaces, not for people.)
Hint
The difference is strength, not chemistry. The same substance diluted can be an antiseptic and concentrated a disinfectant.