Mixtures Definition and 38 Threads

Hi everyone, I'm working with an ultrasonic transit-time flow meter that has preset settings calibrated for water. However, my application involves a 25% propylene glycol and 75% water mixture, and I suspect the speed of sound in this mixture deviates enough from water to affect accuracy. I'm...

Can Silicon and Germanium semiconductors mixture (chemical reaction) with some other chemical elements (if required) assist in creating new and existing robust electronic components? Si + Ge + ? + ? = Can this assist in quantum computing?

What are the methods for quantifying the amount of colloidal particles in sol mixtures?

I understand that colloids (at least those less than 0.7 um in diameter) are not filterable using conventional filters. But are there other physical separation methods that can separate them from solution, apart from using membranes? Centrifugation perhaps? I just want some confirmation. Thank you!

I want to know of any standard method for identifying (and possibly quantifying) the species contained in a solid mixture sample. Thanks in advance!

I've just recently started relearning chemistry. Forgive me for asking such a basic question, but my textbook doesn't use very practical examples with a detailed explanation. So a hetero and homo mixture can be classified as if there compositions (multiple substances) are blended or not. Let's...

HI, Do you have any suggestion for a good solubility database? I tried IUPAC-NIST but I can't find the data I need there (water-toluene, water-hexane, water-MEK mixtures at 40°C). I am also looking for the densities of the pure solvents at 40°C. Thank you

Hi everyone, I am looking for a way to densify silicone oil. Foolishly, I tried to dissolve Calcium Chloride but as well all know, salt will not dissolve in oil. If anyone has any knowledge as to how I can increase the density of silicone oil I would greatly appreciate your input.

http://dwb4.unl.edu/Chem/CHEM869B/CHEM869BInfoFiles/pubCHEM869B-Info005.html In the last question of Quiz 1X Look at lower Ieft hand side. I chose heterogenous mixture but It was given wrong.Why?I chose heterogenous mixture because there are 4 molecules of one substance and only 3 atoms of other...

i know in mixture two or more substance are not chemically bonded whereas in compounds substance are chemically bonded and also in mixtures substance can be separated by mechanical method but not compounds But i want to ask how can i identify whether substance is mixture or compound if it comes...

Homework Statement A vessel of 0.3m3 capacity contains a mixture of air and steam which is 0.75 dry. If the pressure is 7 bar and temperature is 116.9 degree Celsius, find: Mass of water present, mass of dry saturated vapour, mass of air. Answer key: 0.102kg, 0.307kg, 1.394kgHomework Equations...

Is there a way to write p1 |v1> + p2 |v2> if it is not a pure state but a mixture? thanks.

Hi, From the wiki article, I understand that Mixtures can be of three types (by homogenity and particle size): Solution (< 1 nanometer) Colloid (between 1 nanometer and 1 micrometer) Suspension (> 1 micrometer) 1. But if we have two immiscible liquids that each have molecule size...

How do I write the non-approximated Schrodinger equation Hamiltonian for a mixture containing 25% by partial pressure of H2 gas and 75% by partial pressure of He gas, at 100 KPa pressure and 298 K?

Hi there -- can anyone give me, or point me to, an argument that the reduced state density matrix corresponding to one of a pair of entangled particles is an `improper mixture' -- that is, that the particle with that reduced state (a reduced spin state, say) cannot be understood as being in some...

I started with a 100% water sample, and measured the speed of ultrasound using 1MHz transducer, and in 10% increments added propylene glycol to the sample fixture until I reached 100% propylene glycol. Curiously, the velocity of ultrasound waves when plotted against % propylene glycol...

I am 15 years old and doing chemistry as an elective at school. I have an assessment which ask me to "Describe the industrial separation of a mixture to obtain useful chemicals" I have to be able to demonstrate the separation in class. It obviously cannot involve dangerous chemicals, as I am...

Is it true that entropy of mixture of twodifferent ideal quantum gases at 0K temperature is equal 0 that is the entropy of mixing is 0 at 0K (two pure gases would have also 0 entropy).

Hi everyone, I have been given an assignment with my physics subject and describe in 400 words how electromagnetism can be used to determine the composition of different chemical mixtures I was hoping someone could lead me to a couple of websites to do my research. I have entered about...

Hello all! :smile: You know, I thought I knew something about ideal gas mixtures, but now I am not so sure. I am reading through a section of a text that discusses the Dalton and the Agamat models of ideal gas mixtures. I will briefly describe each: Dalton Model: The underlying assumption...

Hi, Homework Statement Consider a mixture of different gases with N_i molecules each (i=1...k denotes the species). For ideal gases the following relation yields: S(T,V,N_1,...N_k)=\sum_{i=1}^k S_i(T,V,N_i) a)Give explicit expressions for the entropy, the internal energy, Helmholtz free...

Homework Statement You prepared a reaction table for 10.0 mL of 0.1 M NH4Cl with 5.0 mL of 0.1 M NaOH. Please choose all of the following that describe the solution that was produced. The choices are: 1. a solution containing only a strong base 2. a solution containing a weak acid and a...

Homework Statement You start with 10.00 g of sand/salt mixture. suppose you end up with 4.52g of sand and 5.9g of salt. a) calculate the % sand and salt based only on the sand result: "4.52 g sand means there must have been 5.48g of salt" b) do the same using only the salt result: "5.9g salt...

A mixture of hydrocarbon gases is composed of 60% methane, 25% propane, and 15% butane by weight. This mixture is compressed from 100 kPa and 20ºC to 1000 kPa in a reversible, isothermal, steady-flow compressor. Determine the work and heat transfer for this compression per unit mass of the...

Homework Statement Two methanol-water mixtures are contained in separate flasks. The first mixture contains 40wt% methanol and the second contains 70wt% methanol. If 200g of the first mixture is combined with 150g of the second, what are the mass and composition of the product? Homework...

I was just asked "Are salt and sand heterogeneous or homogenous mixtures?" I can see that sand is heterogeneous, but why is salt heterogeous? Casey

Are all mixtures solutions and are all solutions mixtures?? Explain.

Descirbe potential and kinetic energy in all mixtures.

[b]1. I have a science test do tommor! I was sick the two last day, so i looked and couldn't find the simmilarties between mixtures and compounds. Homework Equations The Attempt at a Solution

In an 8-gram solution of water and alcohol, the ratio by mass of water to alcohol is 3 to 1. If 12 grams of a solution consisting of 2 grams water for each gram of alcohol is added to the 8-gram solution, what fraction by mass of the new solution is alcohol? -- I know that the first thing you...

Is there a general formula to calculate the refractive index of a mixture of two liquids of known refractive index, e.g. water and ethanol, or water and glycerol?

Hi. In a year 11 physics class, i have been learning about heat. Today, we learned how to calculate the final temperature of a mixture of 2 different substantes. The example we were given was the calculation of the tempreature of a mixture of 2.2kg of ice (-16 degrees celcius), and 0.4kg of...

Greetings, I have just done a lab in which we separated NaCl, NH4Cl, and SiO2. To separate first the mixture was heated and the Nh4Cl sublimed (in which i measured teh content by mass loss) Then I extracted the NaCl using soluability by adding water then evaporating the water leaving the...

i would like to know more about the heat exchange in mixtures and thermodynamics example would be like: How much heat energy is required to change? a) 2.0kg of ice at 0 C to water at 0 C? b) 500g of water at 100 C to steam at 100 C?

suppose you have 3 integers. if the intergers are a mixture of odd and even integers, then why does the sum always equal an odd number?

I understand that there are atomic spectra for the elements, but how do you predict the line spectrum of a mixture of 2 elements like a H-He mixture? Must you combine the lines from both elements? Thanks.

Hi! I'm having trouble answering some questions on a lab I did in class. Any help at all would be greatly appreciated! The purpose of the experiemt was to test the differences between pure substances (elements, compounds) and mixtures. If the procedure would help, here it is: 1. Mix equal...

I'm not sure if this is the right forum for it, but I had a few questions about how color vision works. I know that mixtures of pure colors look like other pure colors. For example, some mixture of pure (monochromatic) green and blue looks like pure yellow. So for a given color, are there an...