Questions tagged [everyday-chemistry]

Applications of chemistry to reagents, reactions and processes of everyday life. Use this tag for question on chemistry in an out-of-laboratory/class context. DO NOT use this tag merely because the question is about simple chemistry.

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82 views

What is the chemical reaction between coins (copper and nickel) and polyvinyl chloride?

I often carry coins in a cheap plastic sandwich bag. A green solid soon appears. Is it copper oxide? How is the polyvinyl chloride greatly accelerating the reaction? Are there other chemicals being ...
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1answer
149 views

Maximum possible hypochlorite concentration from electrolysis?

For reference, "electrochlorination" is just the electrolysis of a simple solution of water and table salt (NaCl) followed by reintroducing the chlorine gas produced. But, the Wikipedia article on "...
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Can activated charcoal be used to filter bacteria out of air? [closed]

As the title says: Can activated charcoal be used to filter bacteria out of air and or gas?
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1answer
88 views

Sargassum seaweed affects porcelain?

We are inundated with Sargassum seaweed here in the Virgin Islands right now. It has a pungent sulphur odor as it decomposes. Coincidentally (or NOT) the porcelain tubs in the condos I work at are all ...
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1answer
146 views

Safely lowering bleach pH without chlorine gas?

According to Eurekalert, by lowering the pH of household bleach (e.g., by adding vinegar or citric acid), we can increase $\text{[HOCl]}$ and consequently greatly improve the disinfecting capabilites ...
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What occurs when stannous fluoride is combined with baking soda in the oral cavity?

I have googled this question in many forms over many months repeatedly. For some background, when stannous fluoride is combined with water, it forms precipitates and/or oxidizes, rendering it less ...
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1answer
38 views

Lyophilization Advantage

I've been reading about freeze drying and how it increases the shelf life of certain foods and is overall a good preserving technique. My question is with regard to the actual process. I understand ...
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1answer
724 views

Is there a substance that hardens in water? [closed]

Im trying to invent a product that starts as a liquid but when exposed to water it hardens. Is there any chemicals that can cause this reaction??
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1answer
41 views

How heat makes raw food become eatable? [closed]

How can heat cooks food? My classmate asked me this but I didn't imagine how it works.
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'Alcohol Free' toiletries

Sometimes I see 'alcohol free' written in big letters on toiletry bottles, such as on deodorants and shaving foams. You would think that the toiletries bearing these words contain 100% no alcohol, ...
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2answers
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How to find the mass of the following solution? [closed]

What is the weight of a 1L of 0.5M solution of NaCl? Is it the whole solution weight 29.22 grams?
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1answer
44 views

Turning Soda Glass into Lead Glass and Fused Silica [closed]

What would be the method of turning Soda Lime Glass into: A. Lead Glass B. Fused Silica Soda Lime Glass is $\ce{SiO2}$ ~70%. Lead Glass is $\ce{SiO2}$ ~ 62.9%. Fused Silica is $\ce{SiO2}$ ~ ...
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Predicting products of chemical equations? [duplicate]

Consider the equation $\ce{2 NaOH (aq) +Cl2 (g) —> NaOCl (aq) + NaCl (aq) + H2O (l)}$. How would one know the products of this reaction? Is there a general way of doing this? I would have no ...
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475 views

Why do gnocchi float when they are cooked?

Gnocchi is a kind of pasta made with flour, potatoes and eggs. They are cooked in boiling water and when they are ready to be eaten they float. Why do they float when they are cooked? I found two ...
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1answer
68 views

How does salt push out the water from vegetables, meat, etc.?

Where can I find out, how does this process work? Have you noticed, that when you salt mushrooms, eggplant... or add sugar to lemon - some "juice" comes out. Any explanations? Or maybe name that ...
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62 views

What does borax do in and to the washing machine? [closed]

Does borax actually do anything to make clothes cleaner? If it does .... Does it do something with the detergent to remove more dirt from clothes? Does it make it easier to rinse detergent and dirt ...
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1answer
73 views

More effective fire extinguisher liquid than water

I join robot fire fighting contest. One of the mission is to extinguish candle by spraying it with liquid (water is default option). For spray mechanism I use pump with Venturi effect principle. Is ...
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1answer
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Is food color E-132 indigotine, carcinogenic?

I have seen different opinions on food color E-132 Indigo carmine (indigotine, FD&C Blue 2) if it forders cancer.
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1answer
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Why does adding salt to boiling water cause it to flare up suddenly?

I was expecting that the water would become less "boily" since the ions in $\ce{NaCl}$ would require energy to disassociate. Instead it turned whitish and the water level suddenly rose and then ...
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1answer
204 views

Is instant coffee an impurity when you add it to water? [closed]

I have this question for chemistry, but can't know whether it is an impurity or not, please help.
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322 views

Does hydrogen peroxide - urea become more active when illuminated?

Dentists' tooth whitening systems and consumer kits use gels containing carbamide peroxide, also known as hydrogen peroxide - urea. Dentists use a light activator: (image from Wikipedia). Consumer ...
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1answer
87 views

From where does sea water get salt?

I have learned that in primary classes that sea water is salty and I had also wondered that, what makes it salty? and my question is, where does sea water gets its salt?
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is rydberg constant and rydberg unit are same? [closed]

i want to ask a question that.is rydberg constant and rydberg unit are same. UNIT OF RYDBERG CONSTANT IS m^-1, right? Then what is rydberg unit.
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1answer
126 views

Electron Affinity negative? [duplicate]

Why is electron affinity negative? An electron carries energy so if we had an electron doesnt that mean we add energy? Please describe in a non-PhD lingo that a first semester chem student can ...
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1answer
156 views

Do I really need to wear protective clothing while using isopropyl alcohol? [closed]

I recently purchased a 500ml bottle of 99% isopropyl alcohol (aka isopropanol aka rubbing alcohol) for everyday use at home. The label for the bottle worryingly states: Wear protective gloves/...
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3answers
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Tape versus 1922 silver coin

I have a 1922 silver half dollar with scotch tape on it. The tape has been on it 50 years plus. It’s dried out and totally adhered to the coin. I’ve soaked it in lemon essential oil and googone but ...
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1answer
61 views

Why does boiling oatmeal “grow”?

When cooking oatmeal (rolled oats, either long-cooking or instant) on the stove or in the microwave, when it reaches the boiling point, if left unchecked it will quickly "grow" and overflow the ...
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1answer
42 views

Composition of Portland Cement before Hydration [closed]

I recently came across a question- Which of following chemicals is NOT found in Portland Cement? A. Di-calcium silicate B. Tri-calcium silicate C. $\ce{CaSiO3}$ D. $\ce{Ca3(PO4)...
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1answer
162 views

Is a person warmed by fire an example of endothermic reaction? [closed]

My chemistry textbook gives the example of a man being warmed by a fire as an endothermic reaction. If the man's body is the system and it is increasing in temperature, how can this be endothermic?
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Is the mass of a mole identical for different elements? [closed]

For example, if I have 2 moles of iron and 2 moles of copper, do I have an equal mass of each?
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234 views

Gluing bakelite together

I have an older stainless steel saucepan with what I've always called a Bakelite handle. The pan fell, the handle broke. If possible, I'd like to glue it. The break is near where the handle ...
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1answer
36 views

Domestic cleaning products and types of solvents [closed]

I have a floor cleaner which washes and vacuums the floortiles. The instructions advise not to use solvent cleaners with it. My understanding is that even water is a solvent. The manufacturers/...
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1answer
1k views

Is teflon a poison if ingested?

Nowadays, a lot of frying pans are made with a non-stick coating. That's usually teflon, or chemically speaking polytetrafluorethylene - $\ce{(C2F4)}_n$. Can you be poisoned if some of that teflon ...
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0answers
121 views

Why is fluoride good for your teeth?

The main component of tooth enamel is calcium hydroxyapatite. I know fluoride ions can replace hydroxide ions in the enamel matrix, slowing the rate of enamel demineralization. Why does hydrofluoric ...
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1answer
2k views

How would you separate sodium chloride and copper sulfate?

I've tried dissolving both compounds in water and evaporating the mixture, but this leaves a combination of brown and green crystals. Is there was any way to cleanly separate both compounds? Any ...
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1answer
72 views

What is chemically different about tea for hard water?

At the supermarket they sold tea for hard water. (Hard water is water with limestone/calcium carbonate in it). There appears to be a chemical modification for foods using this type of water. My ...
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1answer
33 views

Dimensional Analysis [closed]

In a dimensional analysis problem they take 6.20L x (1ft^3/28.3L) x (12in^3/1ft^3) to get 378 in^3. Why do they express the 12in^3 as 12x12x12? To me it would be expressed as 6.20/28.3*12 to get 2....
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HCl + fingernail (set for a year) + H2O2 + Cu [closed]

I had a $\ce{HCl}$ in a container which a year ago a fingernail fell into it there were no way for me to remove it. The result of $\ce{HCl}$ and that fingernail is some brownish solution as shown: ...
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2answers
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Can 99% isopropyl alcohol be stored in a clear container?

I'm planning to get hold of some 99% isopropyl alcohol (aka rubbing alcohol) for the purpose of cleaning electronics, and am going to transfer it from the plastic bottle it comes in to a smaller, ...
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1answer
145 views

Is water with oxygen-17 safe to drink? [closed]

Is it safe to drink and what else can it be used for?
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14k views

Why don't we explode after drinking water?

It is known that acid should be added to water and not the opposite because it results in an exothermic reaction. Our stomach contains HCl, so why don't we explode when we drink water?
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1answer
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The chemical reaction between lemon juice and polystyrene foam cups

I have noticed that when I have lemon juice on my fingers and I touch a polystyrene foam cup (I will refrain from using the term 'styrofoam'), the cup begins to break down, i.e., melt. I can leave ...
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5answers
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Is identifying a chemical equivalent to be able to produce it?

This question is a follow up of another thread, where we are discussing Theresa May's accusation of the Russian government which is supposedly behind the recent chemical attack in the UK. Soon after ...
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1answer
281 views

Why does automotive glass shatter into tiny pieces but glass used in our houses into shards?

Image Source : Bigstockphoto Image source : pinterest The first picture depicts the glass that is found from an accident site, while the second picture depicts the glass that we use in our home. ...
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1answer
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Transesterification of vegetable oils to produce biofuels - problems in the lab

I'm an undergraduate doing a small research project on biofuels. I have 12 hours of lab time to investigate something about biofuels. I've chosen to explore how the fatty acid content of different ...
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1answer
669 views

Why was my soap measured as acidic?

I've always been told soap is basic in pH. A few years back in a high school chemistry class, we measured the pH of various substances with universal pH indicator. We measured some liquid hand soap ...
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1answer
2k views

Why is helium used in diving apparatus?

In my textbook it said that helium is used in oxygen tanks (diving apparatus) by deep sea divers. When I searched the internet for the reason it said that : A mix of helium and oxygen is used in ...
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1answer
740 views

What chemical can cause such a fire? [closed]

A friend of mine who thinks that she is under influence of black magic met an astrologer. The astrologer asked her to wear a t-shirt for three nights and then bring that to him. The astrologer then ...
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Reaction of electromagnetic radiations with the air pollutants [closed]

My friends, who are working on an IoT based technology project, explained their idea to me which is roughly like reducing air pollution by converting pollutants to oxygen ($\ce{O2}$) in any reaction, ...
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1answer
244 views

Does 95.8% silver tarnish as fast 92.5% silver?

I've been trying to find out whether 95.8% (Britannia silver) would tarnish as fast as 92.5% (Sterling silver)? I haven't been able to find much on tarnish for Britannia silver. Given that both ...