Chemistry

It's said when cooking oil is heated on a pan and it starts to give fumes or smoke it is going to be toxic, does it apply to all cases (i.e. as soon as you see smoke or fume) or only extreme case when the cooking oil is heated for too long (e.g. when someone does not pay attention to cooking)

Is breaking of garbage plastic product into microplastics by weathering a physical or chemical process or both? It's said when plastic bottle contains any liquid microplastics will leach into it, what is the reason for this? Isn't plastic usually inert to most substances?

I'm interested in chemistry but it's all new for me and I'm just starting out. I tried to do some calculations but got stuck... I was wondering, for example a supplement has the following values: Molar mass: 306.247 g mol-1 Tmax 2-4 hours Cmax 363.3 ng / ml Half life: 11.21 hours How do you calculate the ng / ml after 5 days at dosing 100mg? Since that 363 ng/ml is at the peak between 2-4 hours if I'm not mistaken? If you use the half life calculation you get a value of ~0.097mg in the system but I assume that it differs per ml for how much someone weighs? Someone at 80kg is probably different then 100kg?

I have an aquarium product used to treat sick fish, apparently made of "Benzaldehyde green" (same thing as malachite green maybe). I got a little bit on my sink countertop and it won't come out! I tried numerous cleaning products, alcohol, scrubbing, nothing! If this stains the countertop forever my mom will murder me. Please advise! Thank you! Here is an image:

I have a hard time understanding the intermolecular forces except hydrogen bonding but the rest is just like...???

Has anyone ever used the Quantum Fold Periodic Table? Its kind of expensive but I think its pretty awesome that they put the Lanthanides and Actinides in their correct positions and the "Key Folds" are a great way to illustrate the Elements 4th Quantum Number, Electron Spin.

I've heard that antibacterial soap is no better than ordinary soap. Can someone please explain how ordinary liquid hand soap works? Does it simply help take off debris, or does it break the cells of bacteria and viruses and therefore render them harmless (kill them)? For example, if someone washed their hands with liquid hand soap but let's just say they didn't wash all of the physical debris off, are the germs left on their hands still considered to be harmful? Thanks

I figure if I have one for biology and another for physics, I may as well round out the high school science trifecta! In "The Simpsons," a recurring chemistry gimmick is to feature sulfuric acid, and to portray it as green, instead of the H2O lookalike it is in real life. I presume the speed with which the acid would eat metal and destroy clothing is exaggerated to save time; and that it would in real life do so more slowly than that; but what of the "green" thing? I know the chemical itself is colourless as are solutions thereof in water with no impurities, but is there supposed to be a kernel of truth to t…

I take it there are a few around here. This question concerns batteries. It includes aspects of both chemistry and metallurgy. Of course you know about the function of lead-acid batteries. But what if depleted uranium was used instead of lead. After all, from what I hear, uranium will eventually (after a very long time) will decay into lead. A uranium atom has 92 electrons compared to a lead atom having 82. Wouldn't uranium make for a better anode - cathode medium than lead? And would such a thing require a stronger acid?

Hi all, first post here, I'm hoping someone can help me with a mixing process I need to do to make a supplement/emulsion (not illegal). My question only relates to the heat and stirring, not any of the substances (question below steps). Below are the steps given: 1. Prepare a water solution containing sugar and warm up to 80-85°C under stirring. 2. In a beaker, weigh the powder and at least one excipient or stabilizer and warm up to 80-85°C under stirring. 3. Pour the solution into the beaker with powder and the excipient under strong stirring and keep at 80-85°C for 5 min under stirring. When the temperature is below 50°C, the formulation becomes transpar…

I sometimes like to throw excess fat or grizzle from barbequed meats onto the outdoor fireplace the evening after my meal, as it enables the whole backyard to smell like barbeque. I was considering trying this with other food items, but don't want to risk inhaling anything that's less safe to inhale than to ingest. Does anyone know of any list of which potentially-harmful fumes are associated with the combustion of specific food or drink items, and/or whether or not it depends on whether or not these food or drink items are expired?

Hi everyone. Possibly moving to an area that has higher than I would like levels of arsenic in the water supply. I plan on drinking bottled water either way but I am concerned about showering, washing dishes, washing hands, etc. I would be living in an apartment so a whole house filter (reverse osmosis, etc) is not an option. Is arsenic absorbed through the skin? I have seen mixed science on this and I am really confused. If it is absorbed, are there are any studies or information on how much is absorbed and how it could effect human health? I appreciate any help

Hey, I'm currently working on a project, involving the use of eggshell waste among others (shellfish, fish bones) being used to synthesize hydroxyapatite [ Ca₁₀(PO₄)₆(OH)₂ ] which can be used in the defluoridation of wastewater from industries, in addition to the ongoing usage of hydroxyapatite in the medical industry for bone tissue and dental procedures. My question is that to what extent is this feasible? is there any specific process that can be utilized to improve the current methods? Any inputs are appreciated.

---------------------------- In the element table is the left column with Hydrogen at the top, and column of metals. If you take any oxidized metal and melt it, you get the metal oxide in liquid form. The oxygen does not separate from this liquid form, if you dont add oxygen-reducing substances, that take the oxygen from the metal, to be able to get the pure metal. So if you, for example, melt iron rust you get a liquid metal oxid. Now...... If you google Hydrogen, there are discussions about whether Hydrogen is a metal or not. Is Hydrogen a metal or what is Hydrogen? If Hydrogen is a metal. Can one then say that water is a liquid m…

English is NOT my first language. I do not understand the last part well. I guess his cream was on fire.

A study done on Honey crystallization says this : The paper aims to promote a new method to prevent honey crystallization by using trehalose, a disaccharide found in all types of honey in different proportions. Two batches of samples, a control one and a trehalose-added one, were analyzed. In each sample with the addition of trehalose were added between 0.0701 and 0.087 mmol of trehalose per 100 g honey. Then later in the article it says this : Control and treated samples weighing 500 g were stored in glass jars in the dark at a temperature of 14-16 °C. In each treated sample, 1.2–1.5 mL of 2% trehalose solution was added. What I need to know , is how many gram…

Dear sir I want to make jelled methanol. How i am do this. please help about this. prem jalani

"The 30th electron of 35Br belongs to 4s." I saw this sentence as a part of a question in my high school chem book, but I don't know whether it's correct or not. It's about the order of filling subshells with electrons; As far as I know, the 29th electron goes to 3d & makes it full, so the next one should go to 4s: 28: 3d⁸ 4s² 29: 3d¹⁰ 4s¹ 30: 3d¹⁰ 4s² But if that's correct, why exactly does 30Zn (or some other elements like 48Cd or 80Hg) belong to the d-block?! (While their last electron belongs to s subshell.) I would really appreciate it if you could answer as soon as possible. AM

My control variables are 1. water hardness level, as I live in the state of Florida, and I lodged at a Ritz Carlton in Florida. I'm not, in any way, affiliated with any corporation herein. 2. my eyeglasses with $700 USD Nikon SeeMax Ultimate lenses. 3. my cleaning method. 4. and my Nikon micro-fiber lens cleaning cloth. When I lodged at the Ritz Carlton hotel, I used their liquid hand wash to dab my eyeglasses. But even when I used different bottles of this hand wash, after rinsing with the hotel's tap water, my eyeglasses remain smudged. I didn't take the images below, but they resemble my smudges. When I …

So when I use the outdoor fireplace, I often like to flip the logs upside down partway through their burning so that i have fresh unburned wood in direct contact with the flames at least twice as often. An uncle of mine once told me this actually does more harm than good to how well it burns, because the heat drives the moisture to the top of the log, and flipping it would cause the flames to be in contact with wetter wood instead of drier wood. I tried Googling this but I haven't found anything on this either way. To those of you better versed in chemistry does this make sense? Why or why not?

I have a collection of PANINI soccer albums and I store them in sticky bags and I wanted to prevent the paper pages from sticking to storage without needing me to check every day or month

Hi All I hope you're well, firstly I'd like to say thank you for having me here I have gone through some of the threads & I'm confident I'm in the correct place for the advice I seek: So to give some context, I purchased my daughters some new makeup from Cosmetify & It came & out of curiosity i was going through some of it & I had an idea that me & my friend could create a new makeup brand similar to www.cosmetify.com. ith no potent chemicals (especially for all daughters) but this is where I'm looking for advice: What would be a safe & reliable chemical with similar properties to dioxane? I'm looking tov avoid any carcinog…

I'm doing some work on fuel cells. When breaking the O-O bond between oxygen gas, two of the three ways involve the word dissociative. However, the sentence is Breaking the O-O bond, which may be dissociative or associatively dissociative. This doesn’t sound grammatically or phonetically correct. Can I instead say breaking the O-O bond by dissociation or associatively dissociation.

1) I know UV causes plastic and rubber to dry out but is fading and yellowing of magazine pages caused by any light or UV light? 2) some kind of fabric that i can cover the magazines and the plastic and rubber of the electronics and give protection from drying and fading? Although I keep the magazines in a closet, it opens you up that some light reflected off the walls can enter

cotton flannel fabric protects plastic and rubber of electronic devices from drying and break out caused by UV?