Thuốc trừ bệnh Aliette | allotrope คือ

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Thuốc trừ bệnh Aliette


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Thuốc trừ bệnh Aliette

What is an Azeotrope?


Get a better understanding of what an azeotrope is and does from the application specialists at MicroCare. More info at: https://www.microcare.com/ where you’ll find azeotropic cleaners that are more effective at cleaning manufactured parts while saving money.
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TRANSCRIPT:
Azeotropes are unique
and difficult to find or make
so they are both rare and special.
Azeotropes used in critical cleaning
have many benefits including lowering your cleaning costs,
boosting your cleaning effectiveness
and enhancing worker safety.
In simplest terms,
an azeotrope is defined as a mixture
of at least two different liquids or molecules
whose proportion cannot be changed
by simple distillation.
So first question, what makes an azeotrope?
For demonstration purposes,
let’s suppose we test an unscientific mixture
that is 95% water and 5% ethanol.
If we boil the mixture
and measure the fumes coming off,
we would notice that the mixture of the ingredients
is still at the same 95to5 ratio.
When we further chill those vapors
and distill the material,
it again will have the same 95to5 mixture ratio.
In fact, no matter what we do,
the mixture always stays at the 95to5 proportions.
This means we have created a theoretical azeotrope.
So our second question is why make an azeotrope?
It’s because azeotropes save
on cleaning fluid and operating costs.
The boiling point of water is about 100 degrees Celsius.
But when we add that precise amount of 5% ethanol,
the boiling temperature suddenly drops.
This is very odd and unexpected.
The two chemicals are still separate
and distinct in the mixture
with no change in their chemical state.
But somehow the two chemicals work together
to lower the combined boiling point.
Most importantly, as an azeotropic mix,
the two constituents boil off at the same rate.
Why is this significant?
Azeotropes are very easy to distill and recover.
If the fluid in a vapor degreaser acts as an azeotrope,
then the fluid can be boiled away and distilled
as a single fluid or monosolvent
while the contamination, fluxes, oils, greases stay trapped
in the liquid at the bottom of the machine.
In effect, trapping and concentrating the contamination
by distillation instead of using filters
and membranes and such
and this easytorecover azeotropic cleaning fluid
recycles hundreds of times before it needs replacement.
So we have created an azeotrope
that cleans more efficiently,
while lowering the amount and cost of solvent use
by recycling and remember
that lower boiling point?
It requires less energy to boil,
another cost saving factor.
So our third question,
why are azeotropes so cool?
It’s simple.
They’re easier to use and add safety
plus azeotropes allow you to tailor the cleaning fluid
to the contamination you want to remove.
Azeotropic behavior allows clever engineers
to deliver the improved cleaning performance
of a tailored mixture
with the convenient handling
and storage of a single compound.
Perhaps one chemical is nonflammable
but not the best cleaner.
But create the right mix with a super cleaner
that happens to be flammable,
we now have a great nonflammable cleaner.
This is a big boost for safety.
Many of the MicroCare cleaning fluids are azeotropes.
And azeotropic cleaners can be specifically engineered
to lower your costs, boost cleaning effectiveness,
and enhance worker safety.
While azeotropes are difficult to make,
the advanced possibilities are almost limitless.
Only MicroCare has the broad range
of ingredients and expertise
to engineer moneysaving safer azeotropes
for your applications.
Look for the term azeotrope in our product descriptions
and SDS sheets.
And Discover Perfectly Clean.
(lively music)

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What is an Azeotrope?

GCSE Chemistry – Allotropes of Carbon – Diamond and Graphite #16


In this video, we explore the diamond and graphite which are two allotropes of solid carbon and we compare their structure and properties. Allotropes are different structural forms of the same element in the same physical state.

GCSE Chemistry - Allotropes of Carbon - Diamond and Graphite  #16

allotropes


allotropes

What Are Covalent Bonds | Properties of Matter | Chemistry | FuseSchool


What Are Covalent Bonds | Properties of Matter | Chemistry | FuseSchool
Learn the basics about covalent bonds, when learning about properties of matter.
When similar atoms react, like nonmetals combining with other nonmetals, they share electrons. This is covalent bonding.
Nonmetals have shells of electrons that are normally half or more than half full of electrons. Since they have a strong attraction for a few additional electrons, it is energetically unfavourable for any of them to lose electrons, so they share electrons by overlapping orbitals. This makes a bonding orbital, or covalent bond, that contains two or more electrons.
Covalent bonds can be represented by a dot and cross diagram. These diagrams show only the valence electrons.
Covalent bonds are directional, which means they are in a fixed position. The overlap between orbitals mean that the atoms in covalent bonds are very close, and make covalent bonds strong.
There are two kinds of covalent structures small molecules, like water, and giant compounds, like diamonds.
The electrons in the bonds are evenly shared, which means the bonds are not polarised; there is little attraction between molecules, and forces between molecules are weak.
Compounds made from small covalent molecules have low melting and boiling points and are volatile. They also don’t conduct electricity.
Carbon and silicon tend to form giant covalent compounds. These bond in the same way, but instead of forming small molecules with one or two bonds, they form four, make up huge lattices or chains of many many linked up atoms. Diamond is a common example, and is made up of Carbon. These compounds have very high melting and boiling points because you have to break covalent bonds rather than intermolecular forces to make them free enough to act like liquids or gases. The covalent bonds hold them rigidly in place in the giant lattice.

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What Are Covalent Bonds | Properties of Matter | Chemistry | FuseSchool

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