https://padlet.com/rajeswari_meganathan/dmk3zyvlbnh3 VII-STD Science(20.01.18) en-us 2018-01-19 09:52:20 UTC 2019-01-28 09:14:59 UTC hello@padlet.com rajeswari_meganathan https://padlet.com/rajeswari_meganathan/dmk3zyvlbnh3/wish/222714463 2018-01-19 09:57:19 UTC https://padlet.com/rajeswari_meganathan/dmk3zyvlbnh3/wish/222714463 rmugilan7014 https://padlet.com/rajeswari_meganathan/dmk3zyvlbnh3/wish/222982972 1. List out the chemicals present in the tap water.

answer: water quality is a Subject that's been big news lately. 
1. fluoride
2. chlorine
3. lead 
4. mercury 
5. PCBs
6. Arsenic 
7. perchlorate
8. dioxin
9. DDT (Dichloro-toichloroethane)    ]]> 2018-01-20 05:15:55 UTC https://padlet.com/rajeswari_meganathan/dmk3zyvlbnh3/wish/222982972 aasifa7002 https://padlet.com/rajeswari_meganathan/dmk3zyvlbnh3/wish/222984597 2018-01-20 06:05:50 UTC https://padlet.com/rajeswari_meganathan/dmk3zyvlbnh3/wish/222984597 snawaz7015 https://padlet.com/rajeswari_meganathan/dmk3zyvlbnh3/wish/222984605 this is a brief list of toxin of drinking water .
Tap water is treated with a large number of chemicals in order to kill bacteria and other microorganisms. In addition, it may contain other undesirable contaminants like toxic metal salts, hormones and pesticides, or it may become contaminated by chemicals or microbes within pipes (e.g. lead, bacteria, protozoa).]]> 2018-01-20 06:06:02 UTC https://padlet.com/rajeswari_meganathan/dmk3zyvlbnh3/wish/222984605 kyokesh7019 https://padlet.com/rajeswari_meganathan/dmk3zyvlbnh3/wish/222984649  Chemicals in drinking-water can come from: • the water source used to supply our drinking-water,  the treatment process water passes through to make it safe to drink, or • the metal in our pipes and plumbing fittings 
lime 
carbon dioxide



]]> 2018-01-20 06:07:53 UTC https://padlet.com/rajeswari_meganathan/dmk3zyvlbnh3/wish/222984649 skeerthika7007 https://padlet.com/rajeswari_meganathan/dmk3zyvlbnh3/wish/222984937 2018-01-20 06:21:58 UTC https://padlet.com/rajeswari_meganathan/dmk3zyvlbnh3/wish/222984937 bhema7004 https://padlet.com/rajeswari_meganathan/dmk3zyvlbnh3/wish/223057686 2018-01-21 02:25:00 UTC https://padlet.com/rajeswari_meganathan/dmk3zyvlbnh3/wish/223057686 jsaniya7005 https://padlet.com/rajeswari_meganathan/dmk3zyvlbnh3/wish/232239498 2018-02-16 07:40:11 UTC https://padlet.com/rajeswari_meganathan/dmk3zyvlbnh3/wish/232239498 jjaveed7011 https://padlet.com/rajeswari_meganathan/dmk3zyvlbnh3/wish/232240489 2018-02-16 07:45:16 UTC https://padlet.com/rajeswari_meganathan/dmk3zyvlbnh3/wish/232240489