It looks like you did the first 18 and gave up when you couldn't do number 19. I would skip it and try some of the later ones if I were you.
19. I believe rust is one such product.
20. Table salt and drinking alcohol (ethanol).
21. Vinegar is correct.
22. I am not sure, but I think this is glass and/or sand.
23. Water is correct.
24. Silicon.
25. Table salt.
There's a few for you. Try looking for key terms on Google. It should give you most of these answers.
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