Hello. 
I`ve got an expierence with theese guys https://network-89730.mn.co/posts/20945490
https://chambers.com.au/forum/view_post.php?frm=3&pstid=11467&page_rtn=12&page=6
http://beadbanter.com/cgi-bin/gforum/gforum.cgi?do=post_editlog;post=5256;guest=87811043
https://forum.lartu.net/viewtopic.php?t=367
https://taylorhicks.ning.com/photo/albums/glencoe-chemistry-chapter-7-study-guide-answers
  that were mentioned before. 
And I watned to claim thanks!