Biggest Mistakes in Chemistry: Dissolving

To see all my Chemistry videos, check out http://socratic.org/chemistry Don't make this mistake about dissolving! When you dissolve ionic compounds, the ionic bonds come apart and then atoms separate. When you dissolve covalent compounds, the covalent bonds do not come apart, and the molecules stay together. The is one of the most commonly made mistakes in chemistry, and it's a misconception that confuses many people.

Comments

1. why HCl can become ionized by water, but C6H12O6 cannot？both are covalent bonds holding
2. Could you speak about associations too?
3. yos solutions plz
4. please do a video on dissociation equations!
5. I love watching your videos because you are very thorough with your explanations and you dont skip anything. But its really obvious when you are making a video and aren't in the mood for making one. :(
6. But why does salt break up to ions as opposed to sugar that breaks into molecules?
7. Why is C2H4O2 the chemical formula for sugar? why is it called sugar?... I had sucrose in mind when you said 'sugar'. And sucrose has another chemical formula, C12H22O11, as you very probably know.
   or were you thinking of carbohydrates? According to the definition, the smallest number of C atoms found in a carbohydrate is usually 3. also, my guess is you probably know that. :)
   the molecule depicted seems to be 2-hydroxyethanal, which is sugar-related, indeed, but not what I'd call 'sugar' (okay, it does fit the general formula (CH2O)n, but so does the formaldehyde... I don't think anyone thinks of formaldehyde as a saccharide or sugar).
   funny thing is, 2-hydroxyethanal isn't really stable in its monomeric form in aqueous solutions, but it is rather a dimer. (see this: https://en.m.wikipedia.org/wiki/Glycolaldehyde)
   I do see what concept you try to explain in your video (ionic vs covalent bounds with regard to their dissociation when dissolving various substances in water). I guess this video is possibly an answer to somebody's question and I'm aware that the thing I mentioned might require a bit more understanding of chemistry.
   Still, it'd be nice to see things explained correctly: either being more precise about what 'sugar' means (and C2H4O2 is more like a 'borderline' sugar, so not the best to choose as an example) and thus, using the right chemical formula and structure for the corresponding compound or still using the same structure (but I wouldn't call it 'sugar', again) and mentioning the dimers (though I see it'd go beyond the basic principle you tried to cover here).
   
   Cheers,
   R. :)
8. Fantastic!
9. You are awesome :) I like your style how you explain Chemistry! It's mind blowing !!
   May god bless you!
10. Please I have a question. Can you explain conditions for crystallisation when salt is added to water. And also conditions at which it dissolves in water. Please it's urgent. I want as many answers as possible.
11. Really these videos are awesome
12. how does water break apart the molecules in sugar
13. u just said how they will be in water but u din explain why, what is the factor that cause the covalent compound to break into molecules
14. When separated why Na+ doesn't react with water and cause burns to our tongue?
15. Lol. This lecture is too cute. Love the handimation with the molecules breaking apart. You make this easier to understand. Thank you.
16. i have a huge crush on you please notice me... </3
17. Can you please do some solutions problems
18. do u have videos explaining solutions?
19. Thanks :) my teacher is stupid
20. So are these chemical or physical changes?