What is Mixture: Definition and 294 Discussions

In chemistry, a mixture is a material made up of two or more different substances which are not chemically combined. A mixture is the physical combination of two or more substances in which the identities are retained and are mixed in the form of solutions, suspensions and colloids.Mixtures are one product of mechanically blending or mixing chemical substances such as elements and compounds, without chemical bonding or other chemical change, so that each ingredient substance retains its own chemical properties and makeup. Despite the fact that there are no chemical changes to its constituents, the physical properties of a mixture, such as its melting point, may differ from those of the components. Some mixtures can be separated into their components by using physical (mechanical or thermal) means. Azeotropes are one kind of mixture that usually poses considerable difficulties regarding the separation processes required to obtain their constituents (physical or chemical processes or, even a blend of them).

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  1. M

    A Mixture density neural network prediction bias

    Hello! I am using a mixture density network (MDN) to make some predictions. My model is very simple with one hidden layer only with 10 nodes (the details of the network shouldn't matter for my question but I can provide more if needed). Also my MDN has only one gaussian component which basically...
  2. hilbert2

    Reactive metal wires in a fuel oxidizer mixture

    Suppose there's some slow burning pyrotechnic mixture like KNO##_3## with powdered charcoal, and several really thin threads/wires of magnesium metal (or zirconium or magnesium/aluminum alloy) are made go through a pile of that mixture. Now I would guess that because a mixture of finely powdered...
  3. tbn032

    Problem regarding vapour density of a mixture

    The vapour density of N204 at certain temperature is 30. Calculate the percentage of dissociation of N204 at this temperature. N2O4(g)⇌2NO2(g)? I am unable to understand the concept behind vapour density of the mixture. Currently, I understand that 2 x vapour density=molar mass. Vapour density =...
  4. J

    Will Mixture Ratio Change in a Tank?

    My wife is wanting to place an empty alcohol bottle filled with Dawn in the toilet tank. Have a 1//16 hole drilled 3 inches from the bottom so the fluid will come out when flushed and the water level gets lower than the hole. The Dawn will stop coming out once the water refills above the hole...
  5. M

    I Water bath and water vapor + air mixture in a closed system

    Hello, At my work I came up with the following question: Say we have a vacuum chamber. Inside the vacuum chamber we have at the bottom a water bath. The rest of the chamber is filled with a air and water vapor mixture. The whole system is placed in a room, is at room temperature and is in...
  6. JD_PM

    A Non-isothermal conditions in liquid-gas nitrogen homogeneous mixture

    I am studying the cavitation theory proposed by...
  7. M

    I Partition function of mixture of two gases

    I have a question about statistical physics. Suppose we have a closed container with two compartments, each with volume V , in thermal contact with a heat bath at temperature T, and we discuss the problem from the perspective of a canonic ensemble. At a certain moment the separating wall is...
  8. maistral

    Departure enthelpy for mixture EOS = enthelpy of mixing?

    Hi. I am well aware that if say, there are two components A and B, the ideal mixing enthalpy between those two components are: (1) hmix = zA hA + zB hB. If I want to get the real behavior of a pure component, I am also aware that; say for example, liquid enthalpy: (2) hL = Href + ∫CpigdT (from...
  9. Krokodrile

    Chemistry Determine the quality/moisture of the vapor/water mixture

    Hello! ;) I need help with two problems. I ready resolve it, but i have a question about if a use the units of the correct way. Because got a little strange results.
  10. George26

    Engineering Deriving the Wassiljewa mixture model equation

    Hello, I'm in the process of deriving the Wassiljewa mixture model equation for a binary solution. I have to find an expression gE which represents the excess g term which is added to gIS, the ideal solution, to predict the g for a real solution. I have gotten up to a point but now I'm stuck...
  11. Will26040

    How do I get the viscosity of a mash mixture in brewing?

    Hi, I am designing a mash tun to produce beer. I have 1300kg of malted barley (at a known density) and 3250kg of water. Please could someone outline a method I could use as I am really struggling. One of the main problems I am having is accounting for the density change of the malt when it...
  12. E

    Evacuation of a liquid-vapor water mixture

    suppose i have liquid and vapor water inside a vessel at say 3000kPa, then i suddenly open the valve, as the water (liquid) flows out the vessel (control volume) is water inside the cv evaporating at the same rate liquid flows out? so the volume of water inside the cv remains constant?
  13. P

    Kinetic Theory - A gas mixture effuses through a hole, find the pressure change

    So I know Dalton's law as stated above which I think is applicable in this question. Then I know the effusion rate is ##\frac{1}{4} n \bar{v}##, and from this we can make a differential for the time evolution of the number density of the gas in the container which is: ##\frac{dn}{dt} =...
  14. L

    Chemistry Partial pressure of He in this gas mixture

    My progress: P(HE) = 0.877*0.75/(0.75+0.5) = 0.5262 atm is this right?
  15. WMDhamnekar

    MHB What is the final pressure of helium and neon gas mixture in this case?

    The answer given to the above question is Final pressure$=\frac{(10.0mol\times 5.00bar) + (5.00 mol \times 20.0 bar)}{(10.0 mol +5.00 mol)}= 10.0 bar$ Is this answer correct? if yes, How and why? My question is while computing this answer, the volumes of each gas is not considered. Note:-...
  16. sagigever

    Finding Percent of Water & Oil in a Mixture from Surface Tension

    I was looking for on the internet for a while without a success. If I know that the surface tension of pure oil is ##\gamma_o=A## and I know that the surface tension of pure water is ##\gamma_w=B## so if I have a mixture of water and oil with surface tension ##\gamma_m=C## am I able to know...
  17. Saptarshi Sarkar

    RMS velocity of molecules in a mixture

    I know that for a single monoatomic gas with RMS velocity ##v_{rms}## , $$\frac 1 2mv_{rms}^2 = \frac 3 2k_bT$$ where ##m## is mass of a single molecule, ##k_b## is Boltzmann constant and ##T## is temperature of the gas. For a mixture of gas, I know that the average kinetic energy after mixing...
  18. V

    How can the molar flow rate of a two-gas mixture be calculated?

    I have two Gases where i know the molar flow rate of each gas. Is there any way to calculate the molar flow rate of the two gases together or is it just the average of the two molar flow rates?
  19. Sebastiaan

    How To Name a Mixture of a Solid and a Liquid

    Alright, I'm trying to find out what the Chemical naming convention would be of a Mixture Aluminium (nanoparticles) and Liquid Oxygen. The Mixture is mended as a monopropellant in a lunar rocket engine.
  20. H

    Partial Temperature of a Gas in a Mixture

    Is there such a thing as a partial temperature of a gas in a mixture? Partial pressure is commonly accounted for and used. It seems that if there are molecules of different masses colliding in a mixture, their average respective velocities in a mixture should be different based on transfer of...
  21. nineteen

    Finding the percentage of composition in the mixture

    The thing is that, I don't know how to approach this question and the particular steps for relevant value findings. Please show me the path, and I will go in it friends. I couldn't attempt as I have no clue how to approach this. Thank you very much in advance.
  22. samak55

    Mixture of different gases at different temperatures

    Homework Statement Hello. I have problém with this system. Mixture of two gases. How can i determine temperature T3? Gas 1 (dry air) - I know T1, p1, m1 Gas 2 (water steam) - I know T2, p2, m2 Output (mixture) P3, (m1+m2); p3<p1;p3<p2Homework EquationsThe Attempt at a Solution Is it possible...
  23. Guilherme Franco

    How volatile is urea in a water mixture?

    I'm seemingly having problems of having too much evaporation of urea in the preparation of a gel. The gel is formed by drying the components in a water mixture, and it takes hours to dry at 70 ºC and dries much faster at 100 ºC (also produces a gel with better consistency), but at 100ºC it seems...
  24. J

    Calculate the final temperature of the mixture

    Homework Statement Consider the following reaction. 2 HCl(aq) + Ba(OH)2(aq) BaCl2(aq) + 2 H2O(l) ΔH = -118 kJ Calculate the heat when 100.8 mL of 0.500 M HCl is mixed with 300.0 mL of 0.450 M Ba(OH)2. Assuming that the temperature of both solutions was initially 25.0°C and that the final...
  25. Another

    Motor Oil: Pure Substance or Mixture?

    i wonder if the motor oil a pure substance or mixture substance i know water are pure substance and i think motor oil same water
  26. T

    Water / steam homogeneous mixture

    We all here (I presume that members here have better understanding of physical processes than average person) know that it isn't a fact that water began to boil at 100°C but much before that. When being heated in an open pot, as the temperature rises, water began to boil and more and more water...
  27. Rafe Zayed

    Thermodynamic properties of a liquid-gas mixture

    How can I calculate thermodynamic property like entropy and enthalpy of 70% steam and 30% air mixture ?( at about 90 degree Celsius and 10 MPa)
  28. M

    Electromagnet Design for Separating Ferrous Material from an Ore Mixture

    Good day I've been the task of designing an electromagnet to remove ferrous material from ore mixture. I've calculated the flux density require to remove the particle from underneath a burden depth of 400mm; which is 792.7177 Gauss. (Force index is: 1.5710*10^6 G^2/m) However what I've been...
  29. J

    MHB Ratio problem: The ratio of Liquid X to Liquid Y in a mixture is 3 to 7

    The ratio of Liquid X to Liquid Y in a mixture is 3 to 7. If the amount of Liquid Y in a mixture is 161, then the amount of Liquid x in the mixture is equal to?
  30. C

    MHB Are components in a gaussian mixture independent?

    Hello all, I have used Expectation Maximization algorithm to approximate a probability density function (pdf) using a mixture of gaussians. I need to square the pdf corresponding to the mixture of gaussians( it is a weighted sum of normal distributions with non-identical parameters). Rather...
  31. Z

    Quantity of an Element in Mixture by Adding another Element

    Homework Statement A mixture of 12 ounces of vinegar and oil is 40% vinegar, where all of the measurements are by weight. How many ounces of oil must be added to the mixture to produce a new mixture that is only 25 percent vinegar? I don’t know how to solve it. 2. Homework Equations May be...
  32. M

    MHB Mixture to create a 50% acid solution?

    How many milliliters of a 10% acid solution must be added to 55 milliliters of a 80% acid solution to create a 50% acid solution? This is my equation set up: 0.10x + 55(0.80) = 0.50(x + 55) Is this correct?
  33. R

    Thermodynamics Gas Mixture - Dew Point Temperature

    Homework Statement Only Number 1, not number 2 Homework Equations Dew Point Temperature T = Saturated Temperated at Vapor Pressure Partial Pressure = (mole fraction) x (Mixture Pressure) The Attempt at a Solution The dew point temperature is only dependent on the pressure of the water...
  34. R

    Gas Mixture - Dew Point Temperature

    Homework Statement Only Number 1, not number 2 Homework Equations Dew Point Temperature T = Saturated Temperated at Vapor Pressure Partial Pressure = (mole fraction) x (Mixture Pressure) The Attempt at a Solution The dew point temperature is only dependent on the pressure of the water...
  35. alan

    Temperature and volume fraction of a liquid mixture

    I have known the interaction parameter of a certain liquid mixture which has the phase behaviour can be described by the lattice model. , is it possible for us to know the temperature at the critical point? Besides, if we know the temperature at the critical point, can the volume fraction of...
  36. Buzz Bloom

    I Q re equilibrium energy relationships for a mixture

    The question I am asking comes from a side issue in another thread. I am seeking an explanation that will explain my wrong understanding of the physics. https://www.physicsforums.com/threads/q-re-wiki-equation-for-t-x-t-2.903984 In post #19 of the above thread I describe my uncertainty about my...
  37. Kaura

    How Can You Accurately Separate and Quantify Components in a Mixed Sample Lab?

    Homework Statement In this lab we are going to be given a mixture containing sodium chloride [NaCl], silicon dioxide [SiO2], Iron filings [Fe], and calcium carbonate [CaCO3] The goal of the lab is to use separation and measurement techniques to determine the percent by mass of each specie in...
  38. A

    Calculating CV of Fuel/Air Mixture @ 25°C

    Homework Statement A fuel gas consists of 75% butane (C4H10), 10% propane (C3H8) and 15% butene (C4H8) by volume. It is to be fed to the combustion chamber in 10% excess air at 25°C, where it is completely burnt to carbon dioxide and water. The flue gases produced are to be used to generate 5...
  39. Saharka

    Heat of combustión of a mixture of two substances?

    Hello chemists, need some help here. I'm trying to calculate the power output of a certain otto cycle using different fuels, specifically gasoline, ethanol and different combinations of the two like 85% ethanol and 15% gasoline or 50% ethanol and 50% gasoline. However I have found it difficult...
  40. P

    Molar Mass of a Mixture: Calculating with nN2, nO2, and p=nRT/V

    Homework Statement Homework Equations M=m/n p=nRT/V The Attempt at a Solution I am confused on getting the molar mass of the mixture, unless the answer is wrong. For nN2 I done 0.79*(3*10-3) which gave me 2.37*10-3kmol For nO2 I done the same but with 0.21 to get 6.3*10-4kmol The ntotal of...
  41. wolram

    B Cold or warm dark matter or a mixture

    This paper favors a mixture, but there are many papers that predict Cold dark matter, is there a particle that can be ruled out, or pushed to the back of favored particles. arXiv:1611.09362 [pdf, other] Hints against the cold and collisionless nature of dark matter from the galaxy velocity...
  42. C

    Specific heat ratio of gas mixture

    I am doing some multi-fluid hydrodynamic modelling and I have a quick question. I think I know the answer, but I am not convinced. One of the things that I need to know is the specific heat ratio, ##\gamma##, for the gas and my question is, how does one calculate this from the values of each...
  43. T

    Calculating combustion temperature of mixture

    Hey guys, I'm trying to write a small article that very simply explains some of the math involved with a rocket engine. I'm not looking for a very accurate answer so I tried the following method 1) Stoichiometry on the fuel which was sugar and saltpeter and their respective enthalpies of...
  44. timelesstrix0

    Specific heat capacity of a mixture

    so for one of my assignments i need to make a calculation which involves the mixture to be made of different types of substance... the heat capacity for each of the different unknown substances that were given: substance 1 = 1250J/kg °C substance 2 = 1130J/kg °C substance 3= 4100J/kg °C i need...
  45. N

    MHB Word problem : income tax and mixture

    Hello everyone! I need help on setting the equations for these problems. For prob 30. I could not solve it because there's no given amount in lbs of the mixture. For prob 28 I really had no idea what it is asking. Please bear with the monetary unit used those problems. These problems are...
  46. S

    Mixture of Water & Kerosene: Vapor Pressure?

    When we mix water and kerosene, what is the vapor pressure of the mixture? Is it just that of kerosene, or an average of vapor pressure of both liquids? (Kerosene floats on top of water which is why I felt like asking this question)
  47. M

    Water and Ice mixture, Find original temperature of water

    Homework Statement An 8 cm3 ice cube (temperature = 0.00 °C) is dropped into a glass with 3 dL juice which results in the ice cube being melted. By doing this, the juice drops to a temperature of 3.00 °C. What was the temperature of the juice before the ice cube was added? (Treat juice as water...
  48. P

    Does Mixing Fluids A and B Create a Predictable Thermal Capacity?

    Hi, Say we have fluid A with thermal capacity C_a and fluid B with C_b. If we create a solution with X% of fluid A and (1-X)% of fluid B, is it true that the new thermal capacity of the mixture will be C_new ?= C_a*X + C_b * (1-X) Or it is a case-by-case relationship that depends on the nature...
  49. K

    A Equilibrium liquid-gas ratio in a binary mixture

    Hi all. I'm in need of a formula to calculate (roughly) the percentage of an ammonia-water mixture (arbitrary ratio of ammonia to water) that will boil off under different pressure/temperature conditions, in the ballpark range of 0.2-1.3 bar and 220K-350K. I don't necessarily need to know the...