https://padlet.com/21mairaferreira/s2a7ql3ih0eynfkj Criado com a melhor das intenções en-us 2021-06-15 17:49:05 UTC 2026-01-20 09:15:32 UTC hello@padlet.com 21mairaferreira https://padlet.com/21mairaferreira/s2a7ql3ih0eynfkj/wish/1608169518 WHMIS stands for workplace hazardous materialsinformation system ]]> 2021-06-15 17:49:20 UTC https://padlet.com/21mairaferreira/s2a7ql3ih0eynfkj/wish/1608169518 21mairaferreira https://padlet.com/21mairaferreira/s2a7ql3ih0eynfkj/wish/1608177174 Pure substances: divided into compound and elements, coumpound being made of two or more types of atoms, and elements only one. As for mixtures, these are when you are able to mix two or more substances. ]]> 2021-06-15 17:53:04 UTC https://padlet.com/21mairaferreira/s2a7ql3ih0eynfkj/wish/1608177174 21mairaferreira https://padlet.com/21mairaferreira/s2a7ql3ih0eynfkj/wish/1608198853 physical properties can be described or done without the change in composition. As for chemical, you can change the composition of the matter. ]]> 2021-06-15 18:03:41 UTC https://padlet.com/21mairaferreira/s2a7ql3ih0eynfkj/wish/1608198853 21mairaferreira https://padlet.com/21mairaferreira/s2a7ql3ih0eynfkj/wish/1608206948 First, Dalton who introduced the idea of an indistructable, un humanly makable atom. Next, Thomson, who introduced the idea of an atom having negatve and positive charges spread throught it. Third, Rutherford, who introduced the idea of positive charges staying in the middle together with neurons, and negative charges all around. Last, Bohr, who introduced the idea similar to a planetarium where negative charges are spread in energy levels all around the nucleus, comoposed of positive and neutrons. ]]> 2021-06-15 18:08:02 UTC https://padlet.com/21mairaferreira/s2a7ql3ih0eynfkj/wish/1608206948