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From Wikipedia

Homogeneous (chemistry)

A substance that is uniform in composition is a definition of homogeneous (IPA: /həmɔ�dʒɪnʌs, ho�modʒi�niʌs/) in Chemistry. This is in contrast to a substance that is heterogeneous. The definition of homogeneous strongly depends on the context used. In Chemistry, a homogeneous suspension of material means that when dividing the volume in half, the same amount of material is suspended in both halves of the substance. However, it might be possible to see the particles under a microscope. In Chemistry, another homogeneous substance is air. It is equally suspended, and the particles and gases and liquids cannot be analyzed separately or pulled apart.

Homogeneity of mixtures

In Chemistry, some mixtures are homogeneous. In other words, mixtures have the same proportions throughout a given sample or multiple samples of different proportion to create a consistent mixture. However, two homogeneous mixtures of the same pair of substances may differ widely from each other and can be homogenized to make a constant. Mixtures can be characterized by being separable by mechanical means e.g. heat, filtration, gravitational sorting, etc.

Solutions

A solution is a special type of homogeneous mixture. Solutions are homogeneous because, the ratio of solute to solvent remains the same throughout the solution even if homogenized with multiple sources, and stable because, the solute will not settle out, no matter how long the solution sits, and it cannot be removed by a filter or a centrifuge. This type of mixture is very stable, i.e., its particles do not settle, or separate. As homogeneous mixture, a solution has one phase (liquid) although the solute and solvent can vary: for example, salt water. In chemistry, a mixture is a substance containing two or more elements or compounds that are not chemically bound to each other but retain their own chemical and physical identities; - a substance which has two or more constituent chemical substances. Mixtures, in the broader sense, are two or more substances physically in the same place, but these are not chemically combined, and therefore ratios are not necessarily considered.



From Yahoo Answers

Question:Describe each, base on particle size. Please give examples. 10 points for best answer P.S. open till 3 hours, it is my assigned work

Answers:A solution is a homogeneous mixture composed of two or more substances. In such a mixture, a solute is dissolved in another substance, known as a solvent. A common example is a solid, such as salt or sugar, dissolved in water, a liquid. Gases may dissolve in liquids, for example, carbon dioxide or oxygen in water. Liquids may dissolve in other liquids. A suspension is a heterogenous fluid containing solid particles that are sufficiently large for sedimentation. An example of a suspension would be sand in water. Unlike colloids, suspensions will eventually settle. A colloid is a type of mechanical mixture where one substance is dispersed evenly throughout another. http://en.wikipedia.org/wiki/Colloids#Classification_of_colloids

Question:Okay, I have a test in chemistry this Wednesday and I'm SUPER confused about all of these terms. Can someone PLEASE help me??

Answers:Solid, liquid, and gas are three phases of matter, determined by temperature and pressure. When a substance is solid it is locked into a specific form. This is the coldest form; heat is just a measurement of how much the atoms 'wiggle', and they are wiggling so little that they stay in a set pattern. As the atoms wiggle a little bit more they get enough energy to break free, but they are still somewhat attracted to one another, so they roll all over each other, and you get a liquid. As they get even more energy and move faster and faster they overcome that force of attraction and are moving so fast that they can't 'grab on' as they pass one another, and you get a gas. Pressure plays into it too. For example, water expands when it freezes, so if it is under a lot of pressure it won't freeze even if it's cold enough, because the pressure keeps it squished into liquid form. This is why there are some lakes miles under the ice in Antarctica; the water is below freezing, but the weight of the ice sheet stops it from freezing and expanding. Homogeneous and heterogeneous refer to mixtures. A mixture is a bunch of stuff which exists all mixed together but which doesn't combine chemically. A Homogeneous mixture is uniform; that is, the same all throughout. You won't see layers in this, everything is evenly spread out. Heterogeneous mixtures have more than one phase. There are further subdivisions. A colloid looks homogeneous, but, microscopically, it is heterogeneous. Milk is an example of a colloid. The particles which are dispersed in a colloid are very small (between one nanometer and one micrometer). In milk, these dispersed particles are little globs of fat which have been emulsified. Heterogeneous mixtures with particles larger than 1 micrometer are called suspensions. These particles are big enough to fall out all on their own; this is called sedimentation. An example would be flour mixed with water; the flour will all gather at the bottom if you let it sit long enough. Homogeneous mixtures with a solvent and a solute is called a solution. The solutes are particles smaller than one nanometer, and the solvent is the continuous medium (usually a liquid) which surrounds them, dissolving them. Salt water is an example of a solution. There are many different types of these (A colloid of a liquid dispersed in air is an aerosol, a suspension of a gas dispersed in a solid is a foam, etc.), but that's the basic gist of it.

Question:my third draft To Karl Boysen: I am writing a letter to appeal my suspension at Texas State University. I am a freshman and I have a GPA of .82, which is unacceptable. I am currently studying pre-Theatre. Just before I left Corpus Christi, my grandfather passed away. He and I were very close and we loved each other, especially through our love of music. He inspired me to go after what I wanted in life. I tried to going to the counseling center at Texas State. My grandfather By the time, I realized I could still bring my grades up, it was too late in the year and though I did passed my finals, I still did not do well enough to get a 2.0 or at least improve my GPA. He died just before the second semester started, and I was distracted mentally because of his sudden death. Since I have put myself in this predicament, it is up to me to get myself out of it. I do not have anyone to blame for this but myself; I simply have not been doing as well as I could be. One of the reasons I must stay in college is to further my education and have something to be proud of a degree. If I am not given another opportunity to improve academically, I am positive I will not be able to live as successfully as I would have been able to with a college education. I will reorganize my priorities to make school the most important; I need to do everything possible to make the grades I need. I am no longer in denial that I need help. I plan to go to the Student Learning Assistance Center for help when I struggle with assignments and when I need to perfect a certain subject matter. I will go to the SLAC with an open mind and realize that there are people who are willing to help others like me who are struggling with classes. In addition, I will find class tutors and join study groups that will assist me in learning material for the specific classes in which I will be taking. Also, I will no longer ignore extra credit assignments teachers' offer, I will begin taking advantage of chances to improve my grade. I believe that I can truly do well in school. Maybe it had to come to this academic suspension to realize that I need to rid myself of mixed feelings about school. I assure you, I am going to do the best I can and pass all my classes because I am not willing to risk the chances of no longer being able to attend Texas State. I plan to retake the three classes I failed within the next two semesters. If I am able to, I will take two of the three classes during the Fall Semester. Since writing essays seems to be one of the reasons why I failed English, I will use the Writing Center to help me improve my essays and improve my ability on analytical essays. Enclosed is my possible current schedule I have registered for and the changes I plan on making for both the fall and spring semester. Also enclosed is a letter and an obituary from my grandfather s death. Thank you for your time. Possible Course Schedules for Fall/Spring Current Schedule (registered for Fall) History 1320 MusP 2110 Psy 1300 TH 1358 TH 1365 Will Change (if able) History 1320 Ps y 1300 Mus 2110 English 1310 (retake) Math 1315 (retake) Spring Schedule English 1320 (retake) Bio 1310 TH 1365 TH 1358 MusP 2110

Answers:Hi Dogmaster, I do believe you are on the right direction but I feel, as though, you argument is weak. Below are a few ideas for you to consider: 1) Anyone can cut out an obituary from the paper to claim it was a relative. If you want to strengthen the argument include something from the funeral like the program or information about your grandfather that was handed out at the funeral home. 2) Reason for staying in school is quite broad and generic. Make it personable and speak about what specific impact it might have on you if you are not able to continue with school. 3) It is logically constructed but very "choppy." Meaning your flow is logical but it is not clear why you have made the change. An example you mention your reason for staying in school and the impact it will have on you if you cannot continue. Then you begin, out of nowhere, start talking about reorganizing your priorities and then you move into getting help from SLAC. They are logically connected but for the reader there is no signal to state you are going to be changing your emphasis. Using transitions or markers along the way to let the reader know you are changing focus is important. 4) Trying to make this more cohesive. At least from reading your posting it reads as though your grandfather died and it impacted your schooling which then impacted your grades. You do not draw that out by talking about the impact it had on you. Instead you avoid the subject by acknowledging that you need to improve. To me, if I was making the decision I would want to know how it influence you, what impact it had on you, how you worked at resolving it, and where you are now. 5) Make it readable by either double spacing or single space within a paragraph the double spacing between each paragraph. 6) You plan is good but it is not clear to me. As a part of your plan I would have included is a target GPA, that is realistic for you to achieve. Along with that I would also include a plan on how you plan to achieve it. This means going beyond support from SLAC and taking quizzes, it means thinking about how many hours a week you plan on studying, and how you will address not understanding any material. Maybe even include milestones, a way to measure your progress against, so that everyone can know that you are on track to achieve what you have planned. 7) Finally be realistic and do not over promise on something that you cannot deliver.

Question:Colloids, Suspensions, and Solutions? What are they? Examples would be nice.

Answers:colloid- a type of mechanical mixture in which extreamly small particles are evenly and stably distributes in on or more others (e.g., whipped cream is a colloid of cream particles in the air) - so basically it is a soluble solid +liquid suspension-a mechanical mixture consisting if liquid or gas with small particles that are distributed through it, but that separate out if the suspension is left undisturbed -so basically a solid+liquid solution-a homogeneous mixture of 2 or more pure substances (e.g., vinegar, because only 1 form is visible, it is uniformed throughout)

From Youtube

Chemistry :I made this video to get extra credit for my Organic Chemistry class. The purpose was to give a visible example of how acids and bases work (basics). Enjoy. ^^ I do not own or claim the songs used on my page. Feel free to rate/comment/or subscribe...although my channel was meant for music, lol. PS There were a lot more chemicals and procedures into making this experiment a success, but i was limited on time. Feel free to add anything you think i might have not covered and should be explained to the public more clearly. = )

Chapter 2 Activity 3: Solutions Suspensions and Colloids :Active Chemistry Teacher Training Videos. Chapter 2 Movie Special Effects