Applications of chemistry to reagents and reactions of everyday life.

learn more… | top users | synonyms

1
vote
1answer
23 views

Regarding food and salt content

I love soup , even a thick soup for dinner yet MANY soup products have 400 to 1000 mg.s of sodium in them. Is there a simple chemical procedure any consumer could do to take the sodium OUT of the ...
1
vote
0answers
27 views

How could household vinegar create a salt on car carpet?

I am not a chemist! My chemistry classes from my molecular biology undergrad are far behind me. But I think I created a salt, and I don't know how. Here is my mystery: I recently got some water in my ...
3
votes
2answers
38 views
+50

Safety when handling cyclohexylamine in non-industrial amounts

Today I was pipetting some cyclohexylamine into smaller bottles so that I don't have to use the liter flask every time I need a little bit of catalyst or plasticizer. I pipetted several 10-20 mL ...
0
votes
1answer
33 views

How to calculate the yield of hydrogen obtained by zinc reduction from hydrochloric acid? [on hold]

Hydrogen gas is produced when zinc reacts with hydrochloric acid. If the actual yield of this reaction is $85\%$, how many grams of zinc are needed to produce $112~\mathrm{L}$ of $\ce{H2}$ at STP? ...
4
votes
2answers
51 views

If salt crystals make a cube shape, what is this 'X' marking?

I am an amateur, with very little professional chemistry knowledge. I was doing a demonstration / experiment with my 6 year old child. We took very warm normal tap water, and dissolved into it a ...
0
votes
1answer
33 views

calculate ph if C=0.02

we have a solution CH3COOH (acetic acid) (0.02 mol/l) and its KA is 1.8*10^(-5) calculate the PH of the solution above I tried everything but I failed and couldn't do it wasted about hours on this ...
0
votes
0answers
15 views

Thermal Decomposition of metal oxides

Does thermal decomposition of metal oxides always produces oxygen?
0
votes
0answers
15 views

Recipe for paper glue

I need to produce paper bags. Is there any simple receipt for making paper glue so that brown (packaging) paper will stick to itself?
0
votes
1answer
20 views

How to dissolve grass/leaves without affecting enclosure?

I've got two questions: What sort of compound can dissolve grass/leaves fastest without leaving "much" trace? What sort of enclosure is required for this to be doen safely and without damaging the ...
12
votes
2answers
150 views

Why does pasta really boil over?

I was making pasta, and I noticed the pasta boiling over. I thought about it some more, and I realized I had no idea why this was happening. When the lid is on, the foam rises. When the lid is off, ...
3
votes
1answer
28 views

How do erasable pens work?

I understand the principle behind an eraseable pencil. Graphite is highly slippery, you rub it onto the paper, and an eraser can rub it off again. I've had friends at school with 'eraseable ink ...
2
votes
2answers
28 views

How does a simple alkaline battery work?

The basic + - electrolyte set up. Modern batteries and the like. How exactly do they work?
1
vote
1answer
19 views

How does hydrogen gas build up in hot water lines?

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 ...
2
votes
0answers
23 views

ice cream float - what causes it? [duplicate]

When you mix ice cream and a soft drink (like coke,) a reaction happens that creates a thick foam. I am assuming the foam id composed of carbon dioxide gas and milk curd, which is produced by the ...
0
votes
2answers
20 views

How many mL of solution will result when 15.0 g of H2SO4 is dissolved to make a 0.200 M solution?

Here's what I have so far. First, I converted 15 grams of H2SO4 to moles using a conversion factor. I calculated that it would be 0.15 moles. Second, I just plugged in the numbers. 0.200 M = 0.15 ...
1
vote
3answers
55 views

Which electrodes do not corrode at all?

I had used spare pieces of metal to perform electrolysis. They all had the disadvantage that they corrode when used as anode - and some of the oxides are toxic (copper, chromium). I've found that ...
0
votes
1answer
19 views

Loading nickel metal hydride battery for the first time

I just bought a new hair clipper and I was about to start shaving my head when I noticed that it was almost at 0%. It has a nickel metal hydride battery. The manual says I have to load it for 24h ...
0
votes
1answer
29 views

What the balanced chemical equation for the conversion of starch to dextrin by dry heating?

This question is related to the toasting of bread. When we toast a slice of bread, the starch in it breaks down into dextrin. I want to know the balanced chemical equation for the process.
0
votes
2answers
49 views

Calculate the molality and molarity of this simple solution [on hold]

Concentrated hydrochloric acid contains 37% (by mass) $\ce{HCl}$. The density of its solution is $\mathrm{1.18 g/ml}$. Calculate the molarity and molality of the solution.
1
vote
2answers
71 views

Real life chemistry question

My freshwater fish tank has a pH of 5.8 and a KH value in excess of 40 or 720+ppm while still maintaining a water hardness of 20 ppm or GH< 1 now I am a math/phsyics student but I have taken both ...
0
votes
2answers
44 views

From liquid to solid by beating

I understand how liquids can become solids by decreasing temperature. To my understanding this is because the molecules slow down and are able to form bonds. However, I'm having problems ...
-2
votes
2answers
47 views

What's a natural substitute for baking powder or baking soda?

What's a natural substitute for baking power or baking soda? I am doing a project where I need a raising agent in liquid form. Naturally, I can't use anything carbonated so baking powder/soda are out ...
1
vote
1answer
28 views

Do various soaps work better when dissolved/used in different water temperatures?

My wife and I have had an ongoing argument about various cleaning agents, and I wanted to get a Chemists' view on it. When we are doing laundry, she will generally clean using the cold water setting ...
2
votes
1answer
45 views

Does a patina on a knife prevent rust?

Before I begin, I think it's worth mentioning that I know little about chemistry and even less about knives. My question is this, having seen many people talk about how patinas work and the best ...
4
votes
3answers
170 views

Demountable simple fume hood

I found this build-plan recycling on the internet (I believe it was originally published in a book written by the infamous clandestine chemist Hobart Huson) which seemed interesting to me. I do not ...
1
vote
1answer
49 views

identification of zinc/aluminium/magnesium with copper sulphate solution

We are doing an experiment and would like to be able to identify zinc/aluminium/ magnesium . Would a copper sulphate solution work ? I hear that it turns black on contact with zinc, stays clear on ...
4
votes
2answers
30 views

Assessing fire hazard of compounds

Following up on a somewhat too broad question about amateur chemist safety, this will be the first to address some of the issues discussed there. I often use the NOAA MSDS database (material safety ...
1
vote
0answers
75 views

Hazardous materials handled by amateur chemists [closed]

I'm a enthusiastic and devoted amateur chemist (in disguise, I'm actually a mathematician), but lately I've been thinking to what extend it is safe to pursue my hobby. I'm after all an amateur with ...
3
votes
2answers
47 views

What is a good way for a laymen to purify alcohol to near 200 proof?

I'm making herbal and medicinal mushroom tinctures and extracts. Normally I'll use everclear but it isn't cheap and 95% alcohol. Also I don't know what that other 5% is. Is it just water? Is ...
1
vote
0answers
25 views

Why are multiple extractions better than a single extraction? [duplicate]

I'm extracting $\ce{N-(4-butoxyphenol)-N'-(4-dimethylaminophenyl)thiourea}$ from thiombutosine (anti-leprosy drug) tablets. I'm doing this extraction with hot ethanol. My question is why are 4 ...
2
votes
1answer
99 views

Vacuum-jacketed distilling column

I was looking for some distillation equipment on Sigma Aldrich because I wanted to perform some vacuum distillation, when I came across a vacuum-jacketed distilling column. Now as far as I understood ...
0
votes
2answers
82 views

The unit of energy, 1 dm³ atm, is equal to how many calories?

I surfed through the internet and visited a number of chemistry websites but only in vain. I couldn't find an answer. Please help! Your quick response will be appreciated.
2
votes
1answer
58 views

What is formed when hydrogen peroxide reacts with titanium?

I just got night contact lenses, and you are supposed to use a "one-step" cleaning solution to clean it over a period of six hours. At the bottom of the lenses case, there is a "titanium plate ...
2
votes
6answers
561 views

How can I demonstrate chemistry with the simplest possible experiment like with the “elephant's toothpaste”? [closed]

I actually have to perform an experiment for my school project, and since chemistry is a subject which has the ability to show some pretty good results, I'm not able to think about a project which ...
2
votes
1answer
72 views

What concentration of sulfur hexafluoride is safe to inhale

I am an 8th grade science teacher doing a unit on density, and I want to inhale helium and sulfur hexafluoride as a fun demonstration. I am open to using any source to purchase from, and money is not ...
6
votes
1answer
206 views

Why does the water in a Powerade bottle tastes a little like Powerade after many refills?

I have a bottle of Powerade and after probably around 20+ refills of water, the new water I put in still tastes/smells a little like Powerade. How does that happen?
0
votes
2answers
122 views

How do I clean a silk tie at the knot?

I would like to know how I can clean a silk tie at the knot. I presume it got filthy, over time, due to "fatty" fingers. I am looking for answers either based on 1) good theory or 2) personal ...
1
vote
1answer
102 views

Why does water volume decrease when salt is added?

help me to know the reason why does water volume decrease when salt is added? our teacher asks us in the class but I don't find any strong reason.please help me.
6
votes
2answers
75 views

How does glue work?

Simple question. How does household glue work? How does it attach to almost any other compound? Thanks.
3
votes
1answer
108 views

Is sodium chloride really odourless? If yes, what do I smell?

I just had to read some general descriptions of sodium chloride and it was always classified as odourless (e.g., by Wikipedia). However, large amounts of table salts (around 1 kg) have a clearly ...
1
vote
1answer
46 views

Why is it a good idea to put some salt in the bread dough?

The salt that you can typically find in a kitchen is the $\ce{NaCl}$, isn't this salt supposed to act as an antiseptic? I find a lot of recipes that suggest the addition of salt when preparing the ...
3
votes
1answer
54 views

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 ...
2
votes
2answers
129 views

Simplest way to balance any chemical equation

In your opinion, what would be the simplest way to balance any size of chemical equation? For example here is an equation: $$\ce{C12H26 + O2 -> CO2 + H2O}$$ I saw some ways by putting letters ...
2
votes
1answer
288 views

What are some good research topics for a high school student?

I absolutely love chemistry and I really want to take part in science fairs. I am also taking an AP chemistry class. Cleaner fuel and energy sources and air pollution (especially due to smog and ...
0
votes
1answer
59 views

endothermic dissolution process

Can anybody give me an example of an endothermic dissolution process, preferably one in which name of the substances involved are easy to remember. I have searched the Web thoroughly but could not ...
0
votes
1answer
106 views

What is going on when pen stops working on a section of paper?

Ever had a ballpoint pen that would all of a sudden hit a 'dead spot' on a sheet of paper and refuse to write? It's clearly not the pen, because when moved off to the corner it would draw perfect ...
1
vote
2answers
134 views

How to dissolve steel without affecting aluminium alloy

Disclaimer: I have very limited knowledge of chemistry My problem is the following: I have motorcycle part made from some sort of Aluminium alloy - most probably 6005, 6061-T6 or 7005. And inside of ...
1
vote
4answers
51 views

How to Find Each Element in Nature

I tried to google this but 'element' as a programming term complicated the search. I'm looking for a site or article that covers how one would find each element in nature, in its most abundant form. ...
0
votes
2answers
90 views

Is decarbonation of water exothermic?

I am interested to know if the reaction is exothermic or endothermic.
0
votes
2answers
77 views

Double Displacement Reactions that produce gas [closed]

What type of double displacement reactions can form a gas. How can i determine if a double displacement reaction will form a gas?