Timeline for How does a mixture not retain its chemical identity?
Current License: CC BY-SA 3.0
19 events
| when toggle format | what | by | license | comment | |
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| Apr 11, 2017 at 11:12 | history | tweeted | twitter.com/StackChemistry/status/851754854523572224 | ||
| Apr 4, 2017 at 22:34 | vote | accept | auden | ||
| Apr 4, 2017 at 16:19 | answer | added | Jan | timeline score: 1 | |
| Apr 4, 2017 at 15:38 | answer | added | Jason C | timeline score: 2 | |
| Apr 4, 2017 at 14:51 | answer | added | Tyberius♦ | timeline score: 2 | |
| Apr 4, 2017 at 13:14 | comment | added | porphyrin | Substances, i.e. molecules are made through chemical reactions. A 'mixture' is a collection of substances, i.e. in chemistry this means molecules. A mixture of fruit, say apples & oranges is no different, the 'substances ' (apples, oranges) retain their identity in the mixture. In chemistry unlike in this fruit example, reactions can also occur and so change the substances (molecules) in the mixture. | |
| Apr 3, 2017 at 23:25 | comment | added | auden | @porphyrin, I don't see though how that relates to whether or not it is a substance - the definition of a substance has nothing to do whether or not a chemical reaction has occurred. | |
| Apr 3, 2017 at 12:42 | comment | added | porphyrin | You can separate a mixture into its different molecules (substances) , it may not be easy though but can in principle be done. Molecules of each type, e.g. alcohol, water, sugar etc. have their own structure , i.e. all water molecules are the same. A mixture assumes that no chemical reaction has occurred, however, if a reaction is made to occur in a mixture then new molecules are made and a different mixture of products results. | |
| Apr 3, 2017 at 12:10 | comment | added | Technetium | Pure ethanol (substance) , ethanol / water (mixture) | |
| Apr 3, 2017 at 12:08 | comment | added | Technetium | @heather , that would be a mixture of substances wouldn't it? | |
| Apr 3, 2017 at 12:07 | comment | added | Ivan Neretin | True, but it may vary if that's your intention. | |
| Apr 3, 2017 at 12:06 | comment | added | auden | @IvanNeretin, you still follow a "recipe" though to create a mixture, so it's composition doesn't vary from sample to sample, right? | |
| Apr 3, 2017 at 12:05 | comment | added | auden | @Joel, right, and I'm saying that why isn't that true for when you combine compounds into a mixture (that it is still a substance). | |
| Apr 3, 2017 at 12:03 | comment | added | Technetium | @heather , Once the elements have formed a compound it is not considered a mixture of those elements anymore it is a compound and a substance too. | |
| Apr 3, 2017 at 12:01 | comment | added | Ivan Neretin | You can't create any arbitrary compound. You may have $\ce{C2H6}$ or $\ce{C2H4}$, but never $\ce{C2H_{5.5}}$. | |
| Apr 3, 2017 at 11:53 | comment | added | auden | @Joel, and a compound (a substance) is a combination of elements (each a substance). I don't see how that's any different. | |
| Apr 3, 2017 at 11:49 | comment | added | Technetium | It's a mixture of substances | |
| Apr 3, 2017 at 11:45 | history | edited | auden |
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| Apr 1, 2017 at 19:23 | history | asked | auden | CC BY-SA 3.0 |