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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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How to Make Ferrofluid in a Bottle

I am trying to accomplish the very famous magnetic Ferrofluid in a bottle aka office desk toy. Before anyone suggest to buy online, I would like to make it myself and learn the whole process VS store bought item. here is a short video of it Grade…
aj Saini
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Strictly speaking, is air homogeneous?

Why would air be considered homogeneous in its gaseous state (by Wikipedia and several other sources) even though its concentration keeps varying with time? A homogeneous fluid as i think of it is as follows: If I take a small part of the fluid the…
The Cryptic Cat
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Liquid to solid when exposed to air

Is there a liquid mixture that will become a solid when exposed to air/oxygen. Preferably a spongy material that is difficult to tear.
Curious
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Would combining essential oils and carrier oils be okay in terms of flash point?

With NO scientific, or chemical background, I am making my own beard oils. I found essential oil recipes online to mix with one or many carrier oils to make beard oil. I want to be original by going out on a limb and exploring other scents besides…
Jerry Collins
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Size of dispersed phase particles in colloid?

I am really confused about what the size of particles of dispersed phase in a colloid is: one of my textbook says its between $1 - 100nm$, another says its between $1-1000nm$, and Wikipedia says its between $2-500nm$. Is there any reliable source…
Gerard
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Can SLES get too old?

I've been using SLES to break surface tension in some water solutions. However after a year or so it seems like the ability to break surface tension seems to wear off in the solutions. So my question is if this is supposed to happen? Does Sodium…
Daniel Jørgensen
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What is the composition of air (oxygen and nitrogen) as it is displaced by propane?

We have purchased an oxygen analyzer that is calibrated with pure nitrogen and pure oxygen. It measures 20.91% when it samples air in the atmosphere. The analyzer is reading in %volume. We have built a container that allows gas to escape. It is…
William Chao
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Methods of mix thick liquids (3D printer Resin), stir, shake or acoustic?

Most of the 3D printing community mixes resins by hand by simply shaking them. This is not 100% effective (I believe) and also creates a lot of bubbles that get in the prints. What method would you recommend? I have tried stirring or rather rolling…
Will Valentino
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Find the molality

Find the molality of a mixture formed by mixing $200cm^3$ of $HNO_3$ that has a $69\%$ of richness and density $1.41g/mL$, with $1L$ of the same acid with $1.2M$ and density $1.06g/mL$. Attempt. The question asked the molarity too, and I think…
Xetrez
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Why are Colloids Heterogeneous?

I understand that the definition of a heterogeneous mixture is a mixture in which 2 or more phases are present, i.e. you can see the mixture is not uniform. I know a homogeneous mixture is a mixture in which only one visible phase is present, but…
Eli Jones
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Difference between Excess property and property changes of mixing

I have some confusion in my mind about the difference between an excess property and a property change of mixing. I know that the Excess property is defined as the difference between the actual value and those of an ideal mixture: $$\…
user29550
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Exothermic liquid-liquid mixing

Does anyone know of a good example of two liquids mixing very exothermically? As a reference, I'm thinking more like NaOH and water boiling when mixed at room temperature than ethanol and water are exothermic but you'll never notice making a gin and…
ericksonla
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Meaning of "Diffusion Rate"

A friend is trying to understand a paper which discusses the diffusion of proteins through milk. Rather than listing a diffusivity (with units [Length]^2/[Time]), the paper lists the 'diffusion rate' of the proteins through the liquid, in units of…
tom
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Is milkshake a heterogeneous mixture?

In my textbook, one of the examples of a heterogeneous mixture is milkshake, I don't see how ? I think the answer depends on the fact that How many phases are there in a milkshake, which I think should be only 1 (if we don't consider any "added…
Venu Gopal Dash
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What would happen if equal parts of hydrochloric acid, mercury and methylene chloride were mixed?

I was going through the archive of Real Life Comics (first time reader, enjoying it so far), and in one of the comics, the main character of the comic reveals he has ordered hydrochloric acid, methylene chloride and mercury from an online chemist,…
Nzall
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