Questions tagged [mixtures]

Questions related to the physical combination of two or more substances on which the identities are retained and are mixed in the form of solutions, suspensions, and colloids.

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39
votes
3answers
12k views

Why do impurities lower the melting point of an isolated substance?

It is known that impurities in a desired isolated product lower the melting point of the mixture, even if the impurities' melting point is much higher than the desired product. Why is that so?
11
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3answers
118k views

What is the carbon dioxide content of a soda can or bottle?

I sort of know how carbonated beverages are carbonated: a lot of $\ce{CO2}$ gets pushed into the liquid, and the container is sealed. There are at least two things I don't know. First, how much carbon ...
4
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2answers
5k views

Why water can't mix with oil or cooking oil?

Why water can't mix with oil or cooking oil (both saturated and unsaturated)?
1
vote
1answer
15k views

Reaction of iron with steam

While studying about reversible reactions, my professor stated that the following reaction is a reversible reaction: $$\ce{Fe + H2O <=> Fe3O4 + H2}$$ She also stated that the product $\ce{...
2
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2answers
12k views

Are melting points for mixtures of solids ALWAYS below the melting points of the individual components?

In every chemistry lab we are taught that mixtures of compounds are going to have melting points lower than either of the components pure melting points. Is this always true? Or can there be ratios ...
21
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1answer
1k views

Is it possible for a compound to be soluble in a mixture of solvents but not the individual solvents?

Some weeks ago one of my friend needed to use turpentine. As a good but ignorant chemist on that point I did some research about it. I found (at the beginning) in the French wikipedia page of ...
9
votes
0answers
606 views

Mixing two containers of each water and ethanol to varying degrees of purity

In the following question, the water/wine mixing problem was recast in chemical terms. However, partial molar volumes can make this a much more challenging problem than it appears on the surface. ...
5
votes
1answer
17k views

What is the solvent and what is the solute?

This question is and I am learning about mixtures, solutions, solutes, solvents, and other terms related to these words. I know that a solute is the substance being mixed with or dissolved into the ...
14
votes
3answers
3k views

Is it possible to boil a liquid by just mixing many immiscible liquids together?

In open air, when vapour pressure reaches 1 atm, boiling takes place. I read that if we add two immiscible liquids together, the total vapour pressure of the 'mixture' is close to $p = p^*_A + p^*_b$,...
13
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3answers
23k views

Are all homogeneous mixtures just solutions?

Or can there be a homogeneous mixture that is not a solution?
9
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6answers
4k views

A quick method for separating liquids?

I'm looking for a way to take 3 separate liquids (liquids which function as paint -- they will all be different colors), put them together into a container, and then rapidly separate them back to ...
7
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2answers
1k views

Miscibility of Molten Metals

While reading about the size of atoms and ions of the Group 1 elements in the textbook "Concise Inorganic Chemistry" by JD Lee, I came across this line: The Li+ is much smaller than the other ions. ...
3
votes
1answer
111 views

What is this equation for?

I have been given a formula on the topic of alloys and temperature, however am unsure specifically what this equation calculates. The equation is as follows: $xC_{1} + (1 - x) C_{2} = C_{3}$ I am ...
3
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0answers
94 views

How could I find the solubility of hydrocarbons such as iso- and n-Butane in liquid Methane?

I am trying to figure out the dissolution capacity of iso and normal butane in methane at very low temperatures (110K). This would allow me to make compositions that prevent freeze out of these ...
1
vote
1answer
548 views

How to predict the effusion/diffusion for a mixture of gases?

Suppose a a container contains a gaseous mixture of methane and hydrogen. The mixture effuses out through a hole in the container. Now hydrogen is lighter gas so it must effuse faster and all of ...
0
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0answers
70 views

Will evaporation from two immiscible liquids blow up a balloon?

Consider the following setup: Two immiscible liquids A and B are placed inside a balloon at a temperature where neither one of them boils. The inside of the balloon contains some argon, and the ...
0
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1answer
103 views

How do antioxidants work? [closed]

A friend and I are doing a project that involves the process behind manufacturing Jet A-1 and specifically the specifications highlighted in DEF 91-91. I was interested to see the information at the ...
-1
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2answers
358 views

Why does a distinction between homogenous and heterogenous mixtures exist?

Take a known homogeneous mixture like air (oxygen and nitrogen) for example. The two have different atomic masses, so the molecular weight is different. If I let the solution sit there for a long time,...