All Questions
Tagged with reactivity everyday-chemistry
7
questions
3
votes
2
answers
9k
views
How to dissolve calcium sulfate fast?
I would like to dissolve $\ce{CaSO4}$ in a hardened condition (e.g. gypsum board) as fast as possible. I have seen in posts about $\ce{CaSO3}$ that vinegar and sulfamic acid are able to dissolve it.
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7
votes
1
answer
2k
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What typically happens to H2 molecules released into atmosphere (with no spark source)?
I'm wondering what happens when $\ce{H2}$ leaks from say a transmission pipe in an unenclosed area. No immediate source of ignition, I know it rises more quickly than helium (x2 I believe) and ...
- 12.1k
-3
votes
1
answer
339
views
Vinegar reaction [closed]
please could someone help me. I poured white vinegar over a small hole where ants where coming out in my patio steps. There was some sand on the step and it started to bubble and fizz. We have been ...
- 475
3
votes
1
answer
181
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Why does the rusting process start from the bent/squeezed portion of iron?
I have noticed that the rusting of iron starts from the squeezed or bent parts of iron piece.
I want to know what is the peculiar reason for the observation that rusting starts from bent or irregular ...
- 41.6k
20
votes
2
answers
45k
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Why does superglue ignite cotton?
Cotton is mostly cellulose, a plant saccharide. Superglue refers to a class of cyanoacrylates. What is it about the two that causes ignition?
I'd imagine that the cellulose in cotton is in its ...
- 1
21
votes
1
answer
2k
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If aliens lived in a hydrogen (or any flammable gas) based atmosphere, would they perceive oxygen to be flammable?
Energy, fuel, and oxygen are needed for a fire to burn. In a hydrogen chamber, if there was a pipe spewing small amounts of oxygen, could you light the oxygen on fire as it began to mix with the ...
- 17.6k
2
votes
1
answer
58
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silicon nitride and sCO2
I want to use silicon nitride ball bearings with a reciprocating piston that will be powered by $\ce{CO2}$ liquid heated to $\mathrm{288^oC}$ becoming super critical. That temperature is the maximum ...
- 17.6k