Mixture Definition and 294 Threads

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

    Density changes of compounds when put in a mixture

    Hello, I was wondering conceptually, why does the density of the individual components change when they are added into a liquid mixture? So consider adding ethylene glycol and water together, when they are added to a container as a mixture, their densities are no longer their densities...
  2. N

    Calculating Concentration in a Mixture of KNO3 and Fe3CN6

    hi,a basic question, i added 20 ml of 1M Kno3 with 20 ml of 2 mM of Fe3CN6. will the concentration of the two chemicals remain same in mixture?? if not how to calculate ... All i need to prepare a 20 ml of a mixture of 1M Kno3 and 2mM Fe3CN6... Thanks
  3. E

    Solving 3 Gas Mixture: Assumptions & PV=mRT

    [b]1. A rigid container is filled with a mixture of three gases: A, B and C. the pressure gauge reads P[T]. The container is evacuated and fill with an amount of gas A equal to that in the original mixture. The gauge now reads P[A]. This process is repeated for gases B and C with the pressure...
  4. T

    Linear Programming Mixture Problem

    Homework Statement Hi, I am having a problem with this particular type of problem. I am just so confused that I don't even know how to attempt these types of problems. Can someone please explain to me how to work with mixture problems.
  5. J

    Calculating the final temperature of a mixture of Ice and Water

    Homework Statement How do I calculate the following. The final temperature of a mixture of of ice and water. Where 176grams of ice at -10celsius mixes with 206 grams of water at 73.3celsius. I have tried this equation in multiple fashions and cannot seems to come to a consistent answer! Any...
  6. J

    Calculating the final temperature of a mixture when ice & water

    Hello, How do I calculate the following. The final temperature of a mixture of of ice and water. Where 176grams of ice at -10celsius mixes with 206 grams of water at 73.3celsius. I have tried this equation in multiple fashions and cannot seems to come to a consistent answer! Any help would be...
  7. E

    Mean Free Path for a Mixture of Gases

    So this is a fairly simple conceptual question: can you estimate/compare the mean free paths for individual components of a mixture of gases? I'm primarily looking at the equation given here and the information accompanying it. Consider the case where we have several individual, separate...
  8. T

    Calculate Quality of Mixture at 5000 kPa, 0.03181 m^3/kg

    Homework Statement If you have a mixture of saturated water vapor and saturated liquid water at a pressure of 5000 kPa, and you measure its specific volume to be 0.03181 m^3/kg, what is the quality of the mixture? Homework Equations Nothing is given :( From lectures I found vtot =...
  9. S

    Effective atomic number for a mixture (with components concentration)

    Assume we have a concentration of any specific material (in mg/M). Let's say for example: Ag (Z=47) with concentration 10 mg/M in water (H2O, Z=7.42). How can I calculate the effective atomic number (Zeff.) for the silver-water mixture if the concentration of silver was 10 mg/M for example...
  10. J

    Heat energy in a mixture to get final temperature

    Homework Statement A glass mug has mass 125g empty. It contains 180g of coffee. Both are at 70 C. I add 15g of creme at 5 C. Find final temperature. Assume creme has specific heat of 2900 J/kg.C . Homework Equations Q = m C (delta)T in joules or Kcalories m = mass in kg...
  11. M

    Gaussian Mixture Model Confusion

    Hi All, I'm trying to implement the Gaussian Mixture Model for background subtraction as described by Chris Stauffer and W.E.L Grimson in their paper "Adaptive background mixture models for real-time tracking." I'm having a little trouble with the logic in the step that updates the mean...
  12. Y

    Can I Calculate the Maximum Air Flow for Maintaining Room Temperature Below 36C?

    Hi all, I have a question here. If I have a room with size of 3m x 7m x 3.5m with equipment of heat dissipation of 4kW. A blower fan is installed in the room to draw in the ambient air into the room to reduce the room temperature. At extreme condition the ambient temperature is around 33C...
  13. M

    Mixture of Gases: Composition & Properties

    Attached is the question and my working, my answers don't match up to the given answers, but they still seem right. Can anybody see where the mistake is?
  14. mathmaniac1

    MHB Can You Prove Equal Proportions in a Liquid Mixture?

    Three tablespoons of milk from a glass of milk are poured into a glass of tea, and the liquid is thoroughly mixed. Then three tablespoons of this mixture are poured back into the glass of milk. Which is greater now: the percentage of milk in the tea or the percentage of tea in the milk?
  15. J

    Differential Equations Mixture problem

    at t=o an evenly mixed 40 liters solution with 100grams of salt is poured into a container. solution comes in at 2 grams per liter at 3 liters per minute and flows out at the same rate. At what time is the salt solution 120 grams? I got -9.something minutes for my answer :/ This question was...
  16. J

    D.E. Mixture problem: Can't find mistake

    I was told I made a mistake somewhere but I can't find it. . .
  17. J

    Diff. Eq. Mixture problem. Did most of the work, Need to solve for C

    I need to solve for C. I know it's probably simple but i don't remember how to. This is what I have so far:
  18. J

    Mixture problem. How to solve for C?

    I need to solve for C. I know it's probably simple but i don't remember how to. This is what I have so far:
  19. Jameson

    MHB Cammie's question from Facebook (finding a mixture through systems of equations)

    A girl scout troop has 20 pounds of candy worth 80 cents per pound. the troop wishes to mix it with candy worth 50 cents per pound so that the total mixture can be sold at 60 cents per pound without any gain or loss. how much of the 50 cent candy must be used? Solve by elimination.
  20. A

    Thermal physics final temperature of mixture

    Homework Statement 250.0g of copper at 100.0°C are placed in a cup containing 325.0g of water at 20.0°C. Assume no heat loss to the surroundings. What is the final temperature of the copper and water? Homework Equations Conservation of Energy mcCΔTc = mhCΔTh The Attempt at a...
  21. S

    Determine the final temperature of the mixture

    Homework Statement A student places 21.4 grams of ice at 0.0C and 13.1 grams of steam at 100.0C in a sealed and insulated container. Determine the final temperature of the mixture. m(ice)= 21.4 g or 0.0214 kg m(steam)= 13.1 g or 0.0131 kg Ti(ice)= 278.15 K Ti(steam)= 378.15 K...
  22. F

    What is the final temperature of the mixture?

    Homework Statement 10 g of water from a water ice mixture (0 degrees C) is added to100 g of water at 20 degrees celsius. what is the final temperature of the mixture? C of water =1 kcal/kg*C Latent Heat of Fusion of water=79.7 kcal/kg Homework Equations Q=mC(Tf-Ti) Q=mL The Attempt...
  23. A

    Solving Final Temp of Ice & Water Mixture

    Homework Statement A 100g piece of ice at 0.0°C is dropped into 500g of water at 100°C. What is the final temperature of mixture. Homework Equations Q=mL (latent heat) Q=mcΔt Qw=-Qx (energy absorbed by water is equal but opposite to that of substance inserted into water) specific...
  24. T

    Compressing Mixture for More Powerful Explosion?

    I have been told that compressing the mixture would make the explosion "more powerful". However I cannot wrap my head around why it would be more powerful. Is it because by compressing the mixture potential energy is formed and thus igniting the mixture would release the potential energy from...
  25. R

    Hydrogen Fluoride gas mixture quantities

    Hi, I am not a chemist but maybe there is somebody who can help me. I need a put together an emergency plan as part of a college law assignment on European Seveso directives. My case study has 17t of Hydrogen and 8t of Fluorine. Both of which combine satisfy the requirement for a lower...
  26. E

    Heat of mixture of two substances (no state changes)

    Homework Statement A 100-g sample of Cu(s), initially at 100oC, is added to 140 g of water, initially at 25oC. What is the final temperature of the mixture? Specific heat (in J g-1 oC-1) Cu(s) 0.385 H2O(l ) 4.184 Homework Equations Q = m * ΔT * c heat lost = heat gained m1 * ΔT1 * c1 =...
  27. C

    Checking my answer/approach - specific gravity of a mixture

    Homework Statement What is the specific gravity of a mixture 40% ethyl alcohol and 60% water? The specific gravity of ethyl alcohol is 0.79.Homework Equations The Attempt at a Solution He showed us a way to do it for another type of problem but I approached it a bit differently and I wanted to...
  28. J

    Vaporization of Mixture at constant temperature

    How is it possible to completely vaporize a mixture at constant temperature? I have seen listed values for ΔH(Vaporization); however, this doesn't quite make sense to me. If a mixture (with two largely diffent boiling points) is at its boiling point in the liquid state and I want to completely...
  29. A

    Gamma Poisson Mixture with finite Gamma

    Dear all I am working with a Gamma-Poisson mixture distribution where (and this is not usual) the support of the Gamma distribution (in fact, I am able to restrict to the neg exponential instead of the Gamma...) is finite, e.g. [0,1]. I would like to derive the mean and a Likelihood...
  30. G

    Mixture of two gases. If we assume each gas behaves ideally,

    I'm just starting to learn thermodynamics. I was just wondering that in case of a mixture of two gases, if we assume that each gas behaves as a ideal gas, does it imply that the mixture will also behave as an ideal gas? Or do we have to state it separately while making assumptions in our problem?
  31. S

    Solving Final Temperature of Copper-Water Mixture

    I need help with a question. I think I have an answer, but don't know if it's right. It also doesn't add up to 0 if I plug in the final temperture into the equation. But I keep getting the same answer. Help please! A 150 g piece of copper at 90°C is placed in 250 g of water at 20°C. Assume...
  32. A

    What's the Formula for Calculating the Density of a Gas Mixture?

    what's the formula for the density of a gas mixture? Thank you! ρ1=m1/v1 ρ2=m2/v2 but the gas mixture isn't ρ1+ρ2.
  33. S

    Compression power equation of a gas mixture

    Homework Statement I have a mixture of hydrogen (H2) and water (vapor) that is compressed from pressure p1 to p2. Mass flow of the mixture is known, as well as mass fraction of the hydrogen in the mixture. Known data: Pressure p1 Pressure p2 Temperature T mass flow Mf mass fraction...
  34. L

    Need Help - Regarding the mixture of circular motion and hooke's law

    Homework Statement A 1.01 kg mass is attached to a spring of force constant 9.5 N/cm and placed on a frictionless surface. By how much will the spring stretch if the mass moves along a circular path of radius 0.485 m at a rate of 2.14 revolutions per second? What i was thinking was using the...
  35. W

    Determing the mass percent of chloride from a mixture of NaCl and KCl salts

    Hi guys, I am doing a lab experiment which involves analysis of a sample of a mixture of NaCl and KCl. I'm using volumetric titration ( Mohrs and Fajans methods) as well a Gravimetric analysis technique. The underlying idea is determine the mass percent of chloride in the same sample using...
  36. K

    Thermodynamics - Quasi 1-D Air Mixture

    Homework Statement Constant area mixing tube with stations (1) and (2) (i.e., (1)-->-->--(2)) At station (1): - Mixture of two air streams, defined as Primary (p) and Secondary (s) u_p = 300 m/s T_p = 900K u_s = 30 m/s T_s = 300K p_1 = 0.1 MPa (A_p)/(A_s) = 1/3 1-D flow assumed...
  37. P

    Differential Equations - Mixture in an overflowing tank

    HOW IS THE FOLLOWING QUESTION DONE? Milk chocolate is being produced in a 300 litre tank, which initially contains 100 litres of milk. The following things then occur simultaneously:  1. Liquid cocoa (made up of equal parts cocoa solids and cocoa butter, both in liquid form) is added at...
  38. B

    Linear isotropic dielectric mixture two materials

    Homework Statement Consider an x1:x2 mix of two linear isotropic dielectrics (by volume). x1+x2=1. On large length scales the mixture is homogenous and can be characterized with a dielectric constant ε_mix but on short length scales the material is granular so the dielectric constant is...
  39. P

    How do I find percentage of a substance in a mixture?

    How is this question done?? Milk chocolate is being produced in a 300 litre tank, which initially contains 100 litres of milk. The following things then occur simultaneously:  1. Liquid cocoa (made up of equal parts cocoa solids and cocoa butter, both in liquid form) is added at a rate...
  40. mishima

    Hydrogen peroxide/ sulfuric acid mixture

    Hi, I'm not sure what I just created. First I mixed sodium iodide with hydrochloric acid. Then to that I added a hydrogen peroxide/ sulfuric acid mixture (thinking it was just hydrogen peroxide). It seems a black precipitate is forming. I was trying to make potassium iodide using an...
  41. Weissritter

    Dextrose-based momentum-sensitive mixture

    O hai, PF So, again, I come in the seek of help. I am usually good for my level on Chemistry, but this question was too hard for me. In the lab, we added 0.8 g of KOH and 30 ml of H2O. Then, 1g of dextrose and methylene blue. Final results were a liquid blue mixture. Thing is, when that thing...
  42. M

    Thermodynamics - Saturated Mixture to Superheated Vapor

    Homework Statement A rigid tank contains 5 lb of a two-phase, liquid-vapor mixture of H2O, initially at T = 260 F with a quality of 0.6. Heat transfer to the contents of the tank occurs until the temperature is T = 320 F. Show the process on a p-v diagram. Determine the mass of vapor, in lb...
  43. M

    Finding the equilibrium temperature of a mixture substances

    Homework Statement 160g of steam at 100°C is added to 1000 g of ice at 0°C. What is the equilibrium temperature of the mixture? Assume the container has a negligible heat capacity. Homework Equations Qloss+Qgain=0;[m*c(delta T)] + [m*c(delta T)] = 0 The Attempt at a Solution i...
  44. G

    Finding Weights for Pure States in a Mixed State

    Homework Statement Let q be a mixed state which we mix from pure states. What are the weights we must take for the pure states, respectively? Let us start the solution with the two-state system. The Attempt at a Solution My problem is I can't decypher what the problem actually is, from...
  45. G

    Calculating the pH of an Acid-Water Mixture

    A flask contains 500 mL of an acid with a pH of 4. If 500 mL of water is added, what will the pH of the new solution be? I don't want to know the answer please* I'm just wondering if it is as easy as adding the two pH's ie. 7 + 4 or do I have to work out the H+ of each ie. 10-7 and 10-4...
  46. K

    Help clarify the probability of pure states and mixture of states

    Hi there, I am reading several books on quantum mechanics and they mention some concepts on coherently and incoherently superpose a bunch of wave functions. As my understanding, if there are series of wave functions, which satisfying a certain distribution, the coherent way to calculate the...
  47. D

    Where to from here? (I need a mixture of academic and life guidance I think )

    This month I surprised myself in a fashion unusual for me. Having attended less than 20% of my lecture courses throughout this academic, continually abused drugs and alcohol, gotten into severe financial difficulties, and ruined my relationship with my parents, I estimated that my average mark...
  48. E

    Derivative of a gaussian mixture

    Is there a closed form expression for finding all the roots of the derivative of a k-component gaussian mixture model?
  49. J

    How to calculate flash point of mixture?

    Hey guys, I would like to create a mixture out of two liquids with an ideal flash point of around 70ºF. The liquids I have to work with are 200 proof (100%) isopropyl alcohol (2-propanol) and aliphatic hydrocarbon mixture (aka hydrotreated petroleum distillates). What I'm looking for is the...
  50. P

    Thermo-Chem, Final Temp of a Mixture

    Homework Statement A 155-g piece of copper at 188oC is dropped into 250.0 g of water at 23.7oC. (The specific heat of copper is 0.385 J/goC.) Calculate the final temperature of the mixture. (Assume no heat loss to the surroundings.) Knowns. 155g Copper Initial Temp 188 C 250.0g Water Initial...
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