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.

You need to consider whether the protons in ethene are chemically equivalent, magnetically equivalent, or both. The lewis structure of ethene: Because of the symmetry of the planar ethene molecule, all H atoms are chemically and magnetically equivalent. The spin system is therefore A$_4$. The ...