Determination of Substance through Density

Determination of Substance through Density DExperiment #1 DENSITY OF SUBSTANCES Prepared by Paul Okweye and Malinda Gilmore Purpose of the Experiment To learn about the properties of matter such as density that are used as a method of physical identification. In this experiment the objectives are: To teach the correct use of a balance and graduated cylinders, To determine the densities of solids, pure liquids and solutions, To determine percent errors during experimental analysis, and To teach the use of graphing of experimental data. Background Information Density, like boiling point, color, odor, solubility, and melting point, is a physical property of matter. Therefore, density may be used in identifying matter. Density is defined as mass per unit volume and is expressed mathematically as d = m / v (Equation 1: d is density, m is mass, and v is volume). The density of a sample of matter represents the mass contained within a unit volume of space in the sample. The units of density, therefore, are quoted in terms of grams per milliliter (g/ml) or grams per cubic centimeter (g/cm3) for most solid and liquid samples of matter. The density of a sample represents the mass of the specific sample divided by its volume. density (g/ml) = mass (g) à · volume (ml or cm3) Eqn. 1 Often, a density varies with temperature because of the volume of the sample such as gases. Therefore, densities are usually determined and reported at room temperature (about 25oC; see Table 1). References such as chemical handbooks always specify the temperature at which a density was measured. As previously stated, density can be used as a method of identification. Various things that density can be useful for are listed below: Table 1. Densities of various substances at room temperature, 25oC. Density is often used as a point of identification in the determination of an unknown substance. The density of the unknown might be used to characterize the unknown from a list of known substances. It is very unlikely for two substances to have the same density, and when added with boiling point and melting point it adds even more validity to the identity of the substance. Density can also be used to determine the concentration of solutions in certain instances. When a substance is dissolved in water, the density of the solution will be different from that of the pure water itself. Handbooks list detailed information about the densities of solutions as a function of their composition (typically, in terms of percent substance in the solution). If a sample is known to contain only a single substance, the density of the solution can be measured experimentally, and then the handbook can be consulted to determine what concentration of the substance gives rise to the measured solution density. Several techniques are used for the determination of density of substances. In general, a density determination involves the determination of the mass of the sample divided by the determination of the volume of the sample. However, the method used for determining mass or volume depends on whether or not the sample is a solid or a liquid. For solid samples, the volume of the solid can be determined using Archimedes’s principle, which states that an insoluble, nonreactive solid will displace a volume of liquid equal to its own volume. Typically, a solid is added to a liquid in a volumetric container (such as a graduated cylinder) and the change in the liquid level is determined. For liquids, very precise values of density may be determined by measuring an accurate volume of liquid in a container that can then be weighed and then determining the mass of the liquid that was measured. A convenient container for determining the volume of a liquid is to weigh a particular volume of liquid in a graduated cylinder. The density of substances is very important especially when talking about buoyancy the tendency or capacity to remain afloat in a liquid or rise in air or gas. Often one asks the question, â€Å"Why does ice float in water?† The answer to that question depends totally on density of the substances involved. When dealing with water, water can be in the form of ice, liquid or solid (Table 2). The density of ice is 0.917 g/cm3 and then density of water in its liquid state at 25oC (room temperature) is 0.999 g/cm3. Therefore, the density of ice is less than the density of water so that is why ice floats in water. Temperature (oC) Density of Water (g/cm3) 0 (ice) 0.91700 0 (liquid water) 0.99984 2 0.99994 4 0.99997 10 0.99970 25 0.99707 100 0.95836 Table 2. Temperature Dependence of Water Density Safety Precautions Safety goggles and lab coat / apron are required for this lab The solutions used in this lab are flammable. Use them only as directed Materials and Chemicals Graduated cylinders (25 mL, 50 ml, and 100 mL) Balance Regular Solid Sample Irregular Solid Sample Liquid Sample (Isopropyl Alcohol) Distilled Water Sodium Chloride (5%, 10%, 15%, 20% and 25% solutions) Procedures A. Determination of the Density of Solids Obtain a regular shaped solid (cubic metal). On your data sheet, write down the name of the solid and describe its appearance. Using a balance, weigh the regular shaped solid. Weigh it on a balance to the nearest 0.01 g. Record the weight on the data sheet in the section labeled â€Å"Weight of the Solid.† Using a 100-mL graduated cylinder, add 75 mL of distilled water. Record the exact volume of water in the graduated cylinder to the precision permitted by the calibration marks on the cylinder. Record this volume on the data sheet in the section labeled â€Å"Initial Volume of Water for the Solid†. Gently place the regular solid (cubic metal) into the cylinder (do not drop the metal because it could splash the water in the graduated cylinder). Read the level of the water in the graduated cylinder, again making your determination to the precision permitted by the calibration marks on the cylinder. Record this volume on the data sheet in the section labeled â€Å"Final Volume of Water for the Solid.† The change in the water (Vsolid = Vf – Vi) level represents the volume of the solid. Calculate the density of the regular solid (cubic metal) using Equation 1. Record the calculated value (experimental value) of the density on the data sheet in the section label â€Å"Experimental Value of Density of Solid.† Compare the calculated (experimental value) density of the regular solid (cubic metal) with the actual density value provided in Table 3. Record the actual density on the data sheet in the section labeled â€Å"Actual Density of the Solid.† Calculate the percent error of your measurement. Record value on the data sheet in the section labeled â€Å"Percent Error of Solid†. Note: Percent Error = Experimental Value – Actual Value x 100% Accepted Value Dry the regular solid (cubic metal) with a paper towel and return the sample to your instructor. B. Density of Pure Liquids Pure Water (Distilled Water) Clean and dry a 50 ml graduated cylinder. Accurately weigh the dry graduated cylinder using a balance. Record weight on the data sheet in the section labeled â€Å"Initial Weight of the Graduated Cylinder (Water).† Add 45 mL of water to the graduated cylinder. Record the exact volume of the water in the cylinder, to the level of precision permitted by the calibration marks on the barrel of the cylinder on the data sheet in the section labeled â€Å"Volume of Water†. Weigh the graduated cylinder and water as accurately as possible. Record weight on the data sheet in the section labeled â€Å"Final Weight of the Graduated Cylinder (Water).† Calculate the density of the water using Equation 1. Record the calculated value (experimental value) of the density on the data sheet in the section labeled â€Å"Experimental Value of Density of Water.† Determine the temperature of the water in the cylinder. You will use the temperature of the water to determine which density value of water to use from Table 2. Record the temperature on the data sheet in the section labeled â€Å"Temperature of Water.† Compare the calculated (experimental value) density of the water with the actual density listed in Table 2. Record the actual density on the data sheet in the section labeled â€Å"Actual Density of the Water.† Calculate the percent error. Record value on the data sheet in the section labeled â€Å"Percent Error of Water†. Clean and dry the graduated cylinder. Rubbing Alcohol Obtain a sample of rubbing alcohol (isopropyl alcohol = rubbing alcohol). Clean and dry a 10 ml graduated cylinder. Weigh the dry graduated cylinder as accurately as you can with the balances you have available. Record weight on the data sheet in the section labeled â€Å"Initial Weight of the Graduated Cylinder (Rubbing Alcohol).† Add 5 mL of rubbing alcohol to the graduated cylinder. Record the exact volume of the alcohol in the cylinder, to the level of precision permitted by the calibration marks on the barrel of the cylinder on the data sheet in the section labeled â€Å"Volume of Rubbing Alcohol.† Weigh the graduated cylinder and rubbing alcohol as accurately as possible. Record weight on the data sheet in the section labeled â€Å"Final Weight of the Graduated Cylinder (Rubbing Alcohol).† Calculate the density of the rubbing alcohol using Equation 1. Record the calculated value (experimental value) of the density on the data sheet in the section label â€Å"Experimental Value of Density of Rubbing Alcohol.† Compare the calculated (experimental value) density of the rubbing alcohol with the actual density listed in Table 3. Record the actual density on the data sheet in the section labeled â€Å"Actual Density of the Rubbing Alcohol.† Calculate the percent error. Record value on the data sheet in the section labeled â€Å"Percent Error of Rubbing Alcohol†. Clean and dry the graduated cylinder. C. Density of Solutions Chemical solutions are often described in concentrations and most times in terms of the solutions’ percent composition on a weight basis. For example, a 1% sodium chloride (NaCl) solution contains 1 g of NaCl in every 100 mL of solution (which corresponds to 1 g of NaCl for every 99 mL of water (H2O) present). Obtain 50 mL solutions of NaCl in H2O consisting of the following percents by weight: 5%, 10%, 15%, 20%, and 25%. Make the weight determinations of NaCl and H2O accurately as possible. Using the method described earlier for samples of pure liquids, determine the mass, volume and density of each of your NaCl solutions. Record that information on the data sheet under the specified section. Compare the calculated (experimental value) density of the NaCl solutions with the actual density listed in Table 3. Calculate the percent errors for each solution. Record value on the data sheet in the section labeled â€Å"Percent Error of NaCl Solutions†. Using Excel, construct a graph of the calculated (experimental value) density of your NaCl solutions (y-axis) versus the percent of NaCl the solution contains (x-axis). Obtain the straight line equation (y = mx + b). Record this equation in the designated area on the data sheet. Name_______________________________________________________________________________ Lab Partner____________________________Section/Day/Time_______________________________ Experiment #1 DENSITY OF SUBSTANCES DATA SHEET A. Determination of the Density of Solids Sample Name ______________________________ Appearance of Solid ______________________________ Weight (g) of the Solid ______________________________ Initial Volume (mL) of Water for the Solid ______________________________ Final Volume (mL) of Water for the Solid ______________________________ Volume (mL) of the Solid ______________________________ Experimental Value of Density (g/mL) of Solid______________________________ Actual Density (g/mL) of the Solid ______________________________ Percent Error of Solid ______________________________ B. Determination of the Density of Pure Liquids Pure Water (Distilled Water) Initial Weight (g) of the Graduated Cylinder (Water) ______________________________ Final Weight (g) of the Graduated Cylinder (Water) ______________________________ Weight (g) of Water Sample______________________________ Volume (mL) of Water ______________________________ Experimental Value of Density (g/mL) of Water ______________________________ Actual Density (g/mL) of the Water ______________________________ Percent Error of Water ______________________________ Name_______________________________________________________________________________ Lab Partner____________________________Section/Day/Time_______________________________ Experiment #1 DENSITY OF SUBSTANCES DATA SHEET Rubbing Alcohol Initial Weight (g) of the Graduated Cylinder (Rubbing Alcohol)______________________________ Final Weight (g) of the Graduated Cylinder (Rubbing Alcohol) ______________________________ Weight (g) of Rubbing Alcohol Sample______________________________ Volume (mL) of Rubbing Alcohol ______________________________ Experimental Value of Density (g/mL) of Rubbing Alcohol ______________________________ Actual Density (g/mL) of the Rubbing Alcohol ______________________________ Percent Error of Rubbing Alcohol ______________________________ C. Determination of the Density of Solutions % NaCl Mass (g) Volume (mL) Density (g/mL: Calculated) Density (g/mL: Actual) % error 5 10 15 20 25 Note: Show calculations in your lab report. Name____________________________________________________________________________ Lab.Partner____________________________Section/Day/Time_____________________________ Experiment #1 DENSITY OF SUBSTANCES HOMEWORK SHEET 1. Explain density in words. 2. What error would be introduced into the determination of the density of the solid if the solid were hollow? Would the density be too high or too low? 3. An insoluble, nonreactive metal sphere weighing 18.45 g is added to 21.7 ml of water in a graduated cylinder. The water level rises to 26.8 ml. Calculate the density of the metal. 4. An empty graduated cylinder weighs 34.4257 g. A 10-ml pipet sample of an unknown liquid is transferred to the graduated cylinder. The graduated cylinder weighs 40.1825 g when weighed with the liquid in it. Calculate the density of the unknown liquid. 5. Your data for the density of the NaCl (sodium chloride) solutions should have produced a straight line when plotted. How could this plot be used to determine the density of any concentration of sodium chloride solution? 6. Examine your graph and determine the density for each of the following percents of NaCl: 3%, 9%, 15%, 21%, and 45%.

Broadcast commission

Children in Jamaica and the world at large are surrounded by opportunities to develop and use emergent literacy skills such as listening, speaking, reading, and writing. Based on a research conducted by the Sesame Street Media, â€Å"Once children get to 7 and 8 years, they are able to focus on activities for longer stretches of time. Their memory, logical reasoning, and problem-solving skills sharpen. Children at this age are also starting to form stronger, more complex relationships outside the family, especially with same-sex peers. The power of media on the society is taken as a axis that media representations are not simply a mirror of society but rather, they are highly selective and merely an example. Therefore, active decisions should be taken at every stage of the process of producing and transmitting media material, regarding what should be included and what should be omitted and how and when a content should be presented. Possible effects such as such as violent or aggres sive behavior, substance use, sexual activity and decreased school performance are major issues.In an aid to prevent this, necessary measures need to be taken in order to mitigate these potential problems. In Jamaica there are directives that electronic media, broadcast radio and television, as well as subscriber television has to follow from the Broadcasting Commission. The Broadcasting Commission role is to monitor and regulate these industries, balancing the interests of consumers, the industries and the creative community in implementing public policy and law. Ender the Broadcasting Law and Regulation Code, there is the Children's Code for Programming. This code sets out standards for the media to rate and schedule or filter programming and provide advisories. This will assist parents and guardians to determine the types of material to which their children are exposed. The procedures in the code arise from the general principles for dealing with child audiences are detailed in t he Children's Charter for programming.According to the code, rating is an assessment of the nature of problematic material in all programming. For the broadcast, media rating will be done of all programming including newscasts, broadcasts of sporting events, music videos, programmer trailers, songs and advertisements where as for the subscriber television services rating will be carried out on each channel. Scheduling or filtering Is ensuring that programming Is only transmitted to the appropriate audience for the type of problematic material it contains.Therefore, the broadcast media programmer are scheduled so that potentially harmful material is not transmitted at times when children can reasonably be expected to be a significant part of the radio or television audiences. Subscriber television services material is filtered so that programming channels rated A or X are only available to subscribers who specifically choose to have that material in their homes. In an effort to do so they provide what is called a Watershed,' established at pm daily.This is a time each day, after which a programming might become increasingly adult oriented. Advisories are information about the nature and make informed choices about what type of programming children in their care are exposed to. For example: According to the Broadcasting Commission, on radio aired between 7:mama and 8:1 Sam, material reviewed song, â€Å"All my ladies if you got it let me know, she thick in her hips, colder than a month licking her lips; a bad ‘matchlocks'. Apple looking so right. She makes me want a piece. I give it to her all night, she doesn't want to leave†.They found this as being offensive sounding words, as it presents a distasteful language, sexual content and it is in Breach of Watershed, (February 6&20 2009 Directives and Children Code). Therefore, it is in the best interest of the Broadcasting Commission that obscene and indecent programming is constitutional, because of t he compelling societal interests in protecting children from potentially harmful programming and supporting parent's ability to determine the programming to which their children will be exposed to at home.In a speech presented by Chairman of the Broadcasting Commission of Jamaica, Hope S. Dunn on July 14, 2010 at the Pegasus Hotel, he stated that, â€Å"Regarding the enforcement of the Children's Code for Programming, there has been significant progress in the quality of the output on electronic media nationally. This is evident from the Commission's Complaints record for the period April 2009 to March 2010, the Commission received sixty-nine (69) complaints. This was a decrease of forty-seven percent (47%) when compared to the previous period.On the other hand the Media Association of Jamaica in partnership with the Press Association of Jamaica has reduced a Code of Ethics for Journalists to create a higher basic standard of journalism across the industry and to improve transparen cy and redress by media houses in the public interest. There is always that time in a media practitioner's career, when he or she would end up at a crossroads where an ethical decision has to be made between right and wrong.Often times, ethical choices are hard to make, but at the end of the day a decision has to be made. Professionals in various fields make choices not Just in a systematic way but most importantly in an ethical manner. With that being said, the press association of Jamaica code of practice, provides requirements for media practitioners to abide by, it also deals with matters of common concern among citizen as it relates to morality and the protection of fairness.Under the provision of the code media practitioners should not identify children under the age of 18 who are involved in cases concerning sexual offences, whether as victims or as witnesses or defendants in a trial. In any news report of a case involving a sexual offence by an adult against a child, the chi ld should not be identified. The adult may be identified if such identification would not cause the identity of the child to be revealed. In cases of incest, for the purposes of the protection of the identification the child, the term ‘incest', where applicable, should never be used.

Studies Show Black Women Are Healthier at a Higher Weight Than White Women

Studies reveal that African American women can weigh significantly more than white women and still be healthy. By examining two standards of measurement — BMI (body mass index) and WC (waist circumference) — researchers found that while white women with a BMI of 30 or more and a WC of 36 inches or more were at greater risk for diabetes, high blood pressure and high cholesterol, black women with those same numbers were considered medically healthy. African American womens risk factors did not increase until they reached a BMI of 33 or more and a WC of 38 inches or more. Typically, health experts consider adults with a BMI of 25-29.9 to be overweight and those with a BMI of 30 or greater to be obese. Peter Katzmarzyks Studies The study, published in the January 6, 2011 research journal Obesity and authored by Peter Katzmarzyk and others at the Pennington Biomedical Research Center in Baton Rouge, Louisiana, only examined white and African American women. No similar racial difference between black men and white men were studied. Katmzarzyk theorizes that the weight gap between white and black women may have to do with how body fat is distributed differently throughout the body. What many call belly fat is primarily recognized as being a significantly greater health risk than fat in the hips and thighs. Dr. Samuel Dagogo-Jacks Findings Katzmarzyks findings echo a 2009 study by Dr. Samuel Dagogo-Jack  of the University of Tennessee Health Science Center in Memphis. Funded by the National Institutes of Health and the American Diabetes Association, Dagogo-Jacks research revealed that whites had more body fat than blacks, which led him to theorize that muscle mass may be higher in African-Americans. Existing BMI and WC guidelines are derived from studies of predominantly white and European populations and do not take into account physiological differences due to ethnicity and race. Because of this, Dagogo-Jack believes that his findings argue for a review of the existing cutoffs for healthy BMI and waist circumference among African-Americans. Sources: Kohl, Simi. Use of BMI and waist circumference as surrogates of body fat differs by ethnicity. Obesity Vol. 15 No. 11 at Academia.edu. November 2007Norton, Amy. Healthy waist may be a bit bigger for black women. Reuters Health at Reuters.com. 25 January 2011. Richardson, Carolyn and Mary Hartley, RD. Study Shows Black Women Can Be Healthy At Higher Weights. caloriecount.about.com. 31 March 2011.Scott, Jennifer R. Abdominal Obesity. weightloss.about.com. 11 August 2008.The Endocrine Society. Widely Used Body Fat Measurements Overestimate Fatness In African-Americans, Study Finds. ScienceDaily.com. 22 June 2009.

Essay on Anorexia Nervosa and Obsessive Compulsive Disorder

Anorexia Nervosa and Obsessive Compulsive Disorder Anorexia Nervosa is an eating disorder often found in young adolescent women, that has been characterized by a distorted attitude towards weight and body image, a set of behaviors calculated to produce weight loss and other physiological and psychological symptoms. Physiological symptoms include (according to the DSM III- R criteria) starvation, amenorrhoea, and a refusal to maintain weight above 85% of their ideal weight. Psychological symptoms include an obsessive pursuit of thinness, along with obvious body preoccupation, and an incessant rumination about food. In addition, they are also engaged in compulsive calorie counting and excessive physical exercise. The†¦show more content†¦In response to their obsessions, most people with OCD resort to repetitive behaviors called compulsions. The most common of these are washing and checking. Other compulsive behaviors include counting, repeating, hoarding, and endlessly rearranging objects in an effort to keep them in preci se alignment with each other. Some people with OCD have regimented rituals while others have rituals that are complex and changing. Performing rituals may give the person with OCD some relief from anxiety, but it is only temporary. People with OCD usually have considerable insight into their own problems. Most of the time, they know that their obsessive thoughts are senseless or exaggerated, and that their compulsive behaviors are not really necessary. However, this knowledge is not sufficient to enable them to stop obsessing or carrying out the rituals. After reading the description of Anorexia and OCD, one can identify many similar symptoms among the two disorders. In addition to these common symptoms, there are biological similarities as well, since serotonin dysfunction has been implicated as one of the possible causes of OCD and anorexia (as well as bulimia nervosa). These factors have led many investigators to study the relationship between anorexia and OCD. Most systematic and controlled studies using a large sample have concluded that there is an association between the two disorders. Various investigators found that OCD was more common in anorexicShow MoreRelatedEssay about Anorexia Nervosa and Obsessive Compulsive Disorder2367 Words   |  10 PagesAnorexia Nervosa and Obsessive Compulsive Disorder It has long been recognized that there are similarities between Obsessive Compulsive Disorder (OCD) and Anorexia Nervosa. These similarities lie in the symptoms of the disorder. Many patients of both diseases report intrusive, fearful thoughts, a compulsive need to perform rituals, and an obsession with maintaining these rituals. 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