Recently I was reading through the owner's manual of a washing machine; notably, the warnings in the front of the booklet. One warning stood out to me; it said that if the hot water in your house has not been run in a few weeks H2 can build up in your lines. The warning of course stated that this...

In movies cool guys don't need a matchbox − they just light a match by scratching it on whatever hard surface − concrete walls, wooden bar tables, leather belts, etc. Is it just a movie trick, or is there actually a type of matches you can do that with? So far I've tried scratching usual matches...

This morning I was boiling carrot dices. And saw something quite interesting happening to the dices. The water is not boiling. But before it boils, the dices started gathering at the center of the pot. Any one has any answer as to why this happened?

This recipe for home-made handwash (liquid soap) consists of bar soap, water, Epsom salts, and coconut oil. The author specifically warns against using 'artificial' Epsom salts, preferring the naturally occurring type, because the 'artificial' type is supposedly contaminated by heavy metals incl...

I heard that there is a standard about cleaned glass, namely Chemically clean glass supports a uniform film of water, with no hanging droplets visible. I tried to clean my dishes at home using detergent. After several efforts, the ceramic-made dish looks like a uniform film of water just af...

If I start with a small amount of a substance, and I dilute that substance with billions of gallons of water, what is the scientific explanation for there being no (actually zero) remaining molecules of that original substance? This question is related to the practice of homeopathic dilutions. I...

Whenever I brush teeth, there are some kind of bubbles sticking inside the cavity and that's uncomfortable, it should be SLS as found on the internet. Does anyone know how do I get rid of those bubbles things easily? Eat\Drink sth ? Tell me if anything is wrong. Any help would be appreciated, t...

Say I have a soft, possibly porous object. I want to coat it with a material, Resistant to boiling water and some scraping Not hazardous, at least after the coating Largely transparent The idea is to take, say, a fruit with the insides removed and to make a cup or a vase out of it. Is there ...

I have a practical question: today I have to clean the oven, and it doesn't have self cleaning burn down mode, nor an official scraper I can use... It's full of charred grease and sugar. I managed to remove 98% of the charred grease with cold grease remover. But it seems that reagent has no effe...

Fish oil, is susposed to suffer from rancidity(i.e. oxidation) when stored improperly , for example in hot temperature. I'm interested in buying fish oil from abroad(usa) it will be shipped by air and won't be kept in a cold chain,i live in a mediternean nation(climate wise). How should i ch...

When is described: "In normal conditions, viscose absorbs 11 to 14% of water vapour. In liquid water, they swell and can absorb 80 to 120% of water." (Clothing Technology) What do they mean with 'normal conditions'? In open air?

Does anyone know if the Casein/Whey Cows Milk Protein can be found within processed lactose ? Some background to this is our 4 month old baby was given teething granules. She was then presented with a rash, screaming etc etc. When we checked the teething granules (called teetha) we found they co...

What are some white compounds that look like powder (like flour) and immediately black after being heated? It turns immediately black and creates a odorous gas.

It seems that a rinsing agent helps the dishes in the dishwasher dry much better than they do without it (which I recently noted on my new dishwasher). What molecules are used in the composition of these rinsing agents? How do they help the plates dry?

I am watching the Stoke vs Swansea, and to be honest, it's pretty boring. So much so, that I've started to wonder why it is that my beer has turned into a slushy after being taken out of the freezer. I bought it this morning, it wasn't very cold, so just before the game I put it in the freezer ...

Hand sanitizer is gel in its bottle, but when I pour it on my palm, it turns into a free flowing liquid. Why does that happen? It does not turn to a liquid when I pour it on my floor or my table. It does not seem to be related to heat, as I tried it with a hot surface.

In common composition they are the same but there may be a little difference due to the antibacterial materials added and the smell.

What is "the most fundamental" state of matter? By fundamental, I mean a state in which no perturbing forces affect the particles; we let the particles exist in the most isolated way. Following this train of though, I am left with that a gas, an ideal gas, is the most fundamental state of matter....

I had thought that the non significant figures determined whether the least significant figure was to be rounded up. For example, given the number $9.1145$, if the number is to be expressed as three significant figures, then, I had thought that, it would be expressed as $9.12$. However, I notic...

I'm just learning about significant figures (sig figs) in my chemistry class, and I'm confused about the rules. An example to my problem: if I had the following expression: $$\left ( \frac{2.378 - 1.2}{1.03} \right )$$ I've thought of 2 ways to approach this. Which one is correct (or is neither c...

Today a friend showed me something we could not explain: She had a pan which she used for years to heat water. On the bottom it had a thick layer of calcium carbonate. She forgot the pan on the hot plate. So all the water evaporated. Then the calcium carbonate layer at the bottom got really bla...

I know that the definition of molecularity of a reaction is number of species reacting in an elementary step. But considering the theory of microscopic reversibility for elementary reactions, each reaction can be assumed to be reversible. In that case, if $$\ce{A <=> B + C}$$ then what is the mol...

Applying pressure can result in chemical changes, does this hold true for an avocado?

As the question title says, I would like to know what the physical and chemical properties are. If possible, please include examples. Since it seems to be related, I would also like to know what physical and chemical changes are. I believe that things such as crushing a can is a physical change, ...

I want to create a small wind tunnel for testing of aerodynamics for Radio controlled units (Cars, planes and helicopters). In real wind-tunnels water mists are used but water isn't a good thing for the electronics. I have considered the following: Smoke bombs, but the smoke develops too fast...

I'm trying to have a conversation/debate about the SmartKleen laundry detergent alternative, but lack the knowledge to understand if their explanation is science or pseudoscience. Far Infrared emission at cold water temp, smaller water molecule clusters, magnets that increase levels of dissolved...

Apologies in advance as I am not a science person by any definition. By most, I'm probably not a person but we'll let that be. I am studying the notion of "change" in things and focusing on chemical change. Could someone please let me know if: the change in the color of a photogray (photosensi...

I'm trying to have a conversation/debate about the SmartKleen laundry detergent alternative, but lack the knowledge to understand if their explanation is science or pseudoscience. Far Infrared emission at cold water temp, smaller water molecule clusters, magnets that increase levels of dissolved...

As the question title says, I would like to know what the physical and chemical properties are. If possible, please include examples. Since it seems to be related, I would also like to know what physical and chemical changes are. I believe that things such as crushing a can is a physical change, ...

I want to know what happens if $\ce{CO}$ and $\ce{GO}$ react. Through the internet the reaction of GO with $\ce{H2O}$ is available but I did not find anything about carbon monoxide.