All Questions
Tagged with everyday-chemistry heat
25 questions
-1
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1
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210
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Is there any chemical that can react with two different chemicals to generate heat or cold? [closed]
For example. There are three chemicals. Chemical A,B,C
Chemical B react with Chemical A = heat
Chemical B react with Chemical C = cold
Is there any chemical available like this? And is it safe to ...
- 7
1
vote
1
answer
232
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Calculating Enthalpy of formation versus Calculating Enthalpy of a reaction not occurring at standard conditions
My understanding of Hess's law and its use in determining the change of enthalpy of a reaction has been challenged recently.
Up until recently, I thought that the only way to calculate a chemical ...
- 13
0
votes
0
answers
87
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Dry ice sublimation rate in water
As I got some a finger sized of dry ice in water, it started to bubble vigorously as expected and gave off a lot of smoke. But after 3 minutes or so, the rate of sublimation seems to slow down a lot, ...
- 19
14
votes
1
answer
522
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What factors promote honey's crystallisation?
Honey is a complex mixture containing, probably, more than hundred compounds.
I understand that the % of those components will affect the crystallisation.
However, I am wondering what factors may ...
- 281
2
votes
1
answer
320
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How does heat transfer between molecules happen in deep?
Inside the container is cold water and outside the container is hot water. B is the microscopic view of container walls .W is water
And A is hot water.
What I have shown is the microscopic view of ...
- 412
0
votes
1
answer
3k
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Why does boiled water have a different taste as compared to cool water? [duplicate]
I have noticed it frequently and decided to check with some of my peers and friends about this and they too have felt such a thing.
The taste comparison occurs after the boiled water is cooled down to ...
- 431
2
votes
0
answers
1k
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Which cup of tea cools down more quickly?
There are 2 cups (both cups are identical) of tea which are served at the same temperature. Assume that the walls of the cup to be non-heat conducting. Which cup of tea cools down faster, a full-...
- 163
28
votes
3
answers
8k
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What properties of carbon dioxide make it a greenhouse gas?
Why is it that heat from the Earth reflects back off carbon dioxide and other greenhouse gases but not gases like nitrogen or oxygen?
- 487
4
votes
1
answer
3k
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When heat is increased, does water move upward in a straw due to increased capillary action or increased pressure?
I left a water bottle with an internal straw in my car throughout a long, hot day. When I opened the bottle at the end of the day, water immediately splashed out from the straw. This made me wonder if ...
- 45
3
votes
1
answer
79
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Aluminium, heat and biological safety
I'm currently working on a really simple project, an ashtray that can stop cigarette combustion.
I planned to put an aluminium block into my ashtray, with some kind of curves or holes in it, in order ...
- 133
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 ...
- 321
6
votes
1
answer
681
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Are wrinkles\folds in paper reversible by heat, pressure or something else?
I ran into this question on Lifehacks.SE, regarding how to remove wrinkles from a crumpled piece of paper. Suggestions included ironing the paper or placing it under some heavy books for a few days.
...
- 1,410
29
votes
5
answers
26k
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Microwaving a glass of water, what happens?
Most of us here would already know the simplified idea behind microwaving food: Microwave radiation hits the water molecules present in food, which excites them and causes 'em to vibrate rapidly in ...
- 18.8k
1
vote
1
answer
82
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Heating paper to a yellowish smoke
I put some papers into a biscuit tin and put it over fire and baked it. Then I made a small hole at the top and saw yellowish smoke coming out. Any idea what the smoke could be?
- 13
4
votes
2
answers
2k
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Minimum amount of water in pressure cooker
When cooking I would like to know the minimum amount of water I can add to my 6.2 L pressure cooker, worst case, so without any food. At second ring cooking the pressure is 0.8 bar.
I assume I need ...
- 151
2
votes
1
answer
3k
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Is there a way to make a liquid cold by a chemical reaction?
I'm looking for a way to combine two substances in a chemical reaction that uses a lot of energy, therefore absorbing heat, to make a substance cold.
I'm thinking about a two-chamber thermos that in ...
- 21
1
vote
1
answer
208
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How to light a candle with small amounts of safe to use chemicals?
Already saw some youtube video where they lit a camp fire with glycerol and potassium permanganate and tried those but the amount of the stuff you need to create enough heat is just too much.
So is ...
- 11
23
votes
3
answers
12k
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Why does milk overflow when boiled?
I was wondering that like whenever I boil milk I just have to keep standing in front of it to make sure that I don't waste any milk but then I was wondering like Why does it even overflow ? In case of ...
- 1,491
1
vote
0
answers
222
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Solvent interaction with thermal paper [closed]
If you place a piece of paper created by a laser printer, e.g. fax paper or some receipts, on top of a piece of normal paper you have drawn on with a Bic Marking 2300 permanent marker, the image ...
- 11
4
votes
1
answer
287
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Is it possible to make broad spectrum light absorbing paint?
Is there such a paint / pigment that absorbs most wavelengths of light (beyond the visible light range) that can be used for solar heat generating applications? If not, would it be possible to make ...
- 377
4
votes
1
answer
4k
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What is the exothermic reaction of superglue with cardboard?
I glued a sheet of paper to a cardboard package using superglue (labelled with ethyl 2-cyanoacrylate).
To my surprise the paper became very warm.
What kind of reaction is it?
- 151
6
votes
2
answers
4k
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What are the physico-chemical processes at play in ironing of clothes?
The process of ironing of clothes removes (to a large extend) the wrinkles that where introduced in the clothes while drying. Obviously this has to be some physico-chemical process that is initiated/...
- 6,750
7
votes
4
answers
83k
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How do I chill water without a refrigerator?
How can we chill water in a plastic bottle without a freezer or refrigerator?
Scenario:
I'm in the office and I have two plastic bottles of water (brought from home). I'm in the office for 3 to 4 ...
- 173
1
vote
2
answers
185
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Egg-Detection in Pastries: An Analysis in Heat-Alterated Molecule Identification
I would like to know if anybody here knows of a method to detect the presence of ovalbumin--or any unique, egg-related molecule, in a baked good. Here I am anticipating that the "unique egg-related ...
- 85
1
vote
1
answer
140
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What determines a substance's energy of activation with air?
Ice will melt when heat is applied; paper will catch fire. In trying to figure out why — what the difference is between things that melt and things that catch — I found "Burn, Char, Melt" by Roberto ...
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