Colloids And Suspensions
ADITYA MAAN (14045007), GAURAV BARAK (14045032), MANOJ DHAKER (14045052)
INTRODUCTION A colloid is a substance which is microscopically dispersed throughout another substance. The word colloid comes from Greek word kolla, meaning glue thus colloidal particles are glue like substances. Colloidal particles pass through filter paper but not through a semipermeable membrane. Colloids can be made settle by centrifugation. Molecules of a hydrophilic colloid have an affinity for water molecules and thus when they are dispersed in water they become hydrated. Hydrated colloids swell and increase the viscosity of the system, hence improving stability by reducing the interaction between particles and their tendency to settle. A hydrophobic colloid has little or no affinity for water molecules in solution and produces no change in system viscosity. Some colloids are translucent because of the Tyndall effect, which is the scattering of light by particles in the colloid. Otherwise
…show more content…
Usually larger than one micrometer. A Suspension is a heterogeneous mixture in which the solute particles do not dissolve but get suspended throughout the bulk of the medium. Parti-cles of suspension are visible to the naked eye. The internal phase (solid) is dispersed throughout the external phase (fluid) through mechanical agitation, with the use of certain suspending agents. Un-like colloids, suspensions will eventually settle. An example of a suspension is sand in water. The sus-pended particles are visible under a microscope and will settle over time if left undisturbed. This distin-guishes a suspension from a colloid, in which the suspended particles are smaller and do not settle. Col-loids and suspensions are different from solutions, in which the dissolved substance (solute) does not exist as a solid, and solvent and solute are homogeneously
Our hypothesis was partially correct, the property changing substances did have the weakest coherency with the lowest drop counts of 23(carbonated), and 14(soap), and pure water did have the strongest bond. What we also found was the the salt also dampened the liquid’s ability to hold onto a penny in large volumes, as all the different salts had a drop average of 24(28x2 & 16), five less than Tap water’s drop count (30). This led us to conclude that pure water has the strongest bond and that all foreign materials weaken the coherency of water. This evidence has led me to believe that similar substances are attracted and are more coherent towards themselves, in this case the water pieces get separated and generally less connected on a really small level due to the obstruction of foreign objects, this is why the different salts perform better than the huge air bubbles or the slippery properties of soap since the latter is more obstructive and the former dissolves with the water and blocks less. When studying a few other groups’ conclusions and data we did indeed find differences: some groups had differing data where a solution had better coherence than water itself which led to differing conclusions.
Spattered blood is a random distribution of bloodstains that vary in size that may be produced by many mechanisms. The size and quantity of spatters produced by a single mechanism vary significantly. The amount of available blood and the amount of force applied to the blood affect the size range of spatters. Spatter is created when sufficient force is available to overcome the surface tension of the blood. The amount of force applied to a source of blood and the size of the resulting spatter vary considerably with gunshot, beating and stabbing events.
Pros and Cons There are several pros to attending Appalachian State University. First of all App is a great school for social sciences (Psychology, Sociology, and Anthropology) which is going to be my intended major. I already have friends who have a house that I could move into and I wouldn’t have to sign the lease. I also love the vibe of the campus; I remember when I had visited over spring break that there was a random drum circle going on in the middle of campus which was pretty cool. I know many people who attend Appalachian.
In 1851, Florida State University was first founded. Fifty-four years later, one of Florida’s most well respected universities was then founded: The University of Florida. If you ask any Florida resident about either of these rival schools, they will 100% have something to say about them, and 110% belong to either the Noles or the Gators. Both being prestigious Universities with outstanding academics, The University of Florida far surpasses Florida State University with its higher ranked majors, underrated football team, and better location and campus appeal.
Briana Silerio Mr. Garcia History 1302 SV1 April 14, 2018 Summer of 1964 Throughout all American history, racism has been an issue. During the 1900s, the government and society were changing for the better to equal Blacks and Whites. During the Summer of 1964, the North, with the helps of black equal rights activists, gathered a large group of White people to go to the South (Watson). They had a mission to help Blacks in the South register to vote.
In this lab, the water molecules stick strongly together and
When temperature is increased, the amount of obtainable energy increases; meaning that particles will move at faster pace at a higher temperature. Thus rate at which molecules diffuse will progressively speed up as the temperature increases. However if temperature of solution is decreased the rate of osmosis will decrease and rate at which molecules diffuse will be significantly less than that of higher
Introduction During this lab, students observed that not all substances dissolve at the same rate. Many factors involved including the independent and dependent variables affect how distinct substances dissolve. Overall, the chemical reaction, “the amount of reactant that changes the product in a given time”, played an important part in this experiment, when proven how a substance can change into another element by either emitting or absorbing energy. (Tro, 2018).
Temperature of the liquid will raise when the entire solid has melted. An impure solid generally melts over a range of temperatures below the melting point of the principal component. Discussion: The main application of melting is chocolate moulding.
. SUPER HYDROPHOBICITY Soumya Ranjan Sahoo (711CH1025) NIT, Rourkela Abstract: Superhydrophobicity as a sensation has turned into an increasing focus of research and technological movement, where its key viewpoints span surface chemistry, chemical physics, and cellular biology. Hydrophobic particles have a tendency to be non-polar and, accordingly, incline toward other neutral molecule and non-polar solvents. Hydrophobic atoms in water frequently bunch together, shaping micelles.
In this lab we used two processes called Diffusion and Osmosis. Diffusion is the movement of molecules from areas of high concentration to areas of low concentration. Diffusion is a process that requires no energy and involves smaller non-polar molecules. In Figure 1 you can see the molecules spreading throughout the glass from the area of high concentration, so that the areas with low concentration are filled evenly as well. The other process was osmosis.
A column is typically packed with a stationary non-volatile matter (stationary phase). The separation occurs due to different interactions of each component with the stationary phase.
Soap’s Effect on The Surface Tension Of Water By: Lusinda Garcia Biology I - Pre-AP December 10, 2017 Introduction Surface tension is when the surface of a liquid that’s in contact with gas, acts like a thin elastic sheet. Water has a high level of surface tension, which means that when the molecules on the surface of water are not surrounded by similar molecules on all sides, they're being pulled by cohesion from other similar molecules deep inside. These molecules bind to each other strongly but stick to the other mediums weakly. It has been proven many times that soap decreases water’s surface tension; however, there is still a vast amount of people that believe soap increases the elasticity of water’s surface tension. Soap’s negative
During the process a mixture is separated into several parts called fractions. Mixtures contain different substance with different boiling points, the differences in boiling points is the main reason fractional distillation is effective. The temperature at which a phase change occurs from liquid to vapor is the boiling point. Fractional distillation Column Fractional distillation column is a fractionating column used for separating a mixture into its various
Introduction Solubility is a chemical property that is measured in terms of the maximum amount of solute dissolved in a solvent at equilibrium. The resulting solution is called saturated solution. For example when a sample of sodium chloride solution in water is heated the behavior of the reaction is endothermic obstructing exothermic behavior. Another relationship that can be said about solubility is that the solubility of a solid substance increases as the temperature increases. The solubility of solutes is dependent on temperature.