Alka Seltzer Dissolving at Different Temperatures Essay example -- Alk

Alka Seltzer Dissolving at Different Temperatures The variable that I will change will be the temperature of the water that the Alka Seltzer is put in. For my results I will measure the time taken for the Alka seltzer tablet to completely dissolve in water at different temperatures. Input variables: * Varying surface area of Alka-Seltzer tablet, i.e. if cut into smaller pieces or crushed it will increase the surface area. (If the surface area is increased (more powdered) the rate of reaction also increases. This means that there are more collisions between the solid and liquid.) * Amount of tap water H2O used, i.e. volume (ml). * Amount of Alka-Seltzer tablets used, i.e. quantity of tablets. (one is used) * Number of times the solution is stirred. (If the solution is stirred more there are more collisions between the particles therefore the reaction is speeded up.) * Temperature of Water-Â °C. (As the temperature increases so does the rate of reaction. By increasing the temperature, particles move faster, i.e. they have more energy. So, they collide with more energy and more frequently.) * pH of Solution: Water has pH of 7 at 25Â °C. As the pH decreases, i.e as the solution increases in acidity, the rate of the reaction increases as well. Output Variables: ----------------- Rate of reaction depends on all the 6 points I have stated above: ----------------------------------------------------------------- * If the surface area of the tablets is increased by crushing, the particles around it in the solution will have more area to work on, and the rates of reactions will increase because there will be more collisions. Complete reaction will finish faster. * The more amount of water used as we increase the temperature, the quicker the tablets will dissolve because there will be more water particles to collide with. So the rate increases. * If the amount of tablets being used is increased for the same amount of water, i.e as concentration increases, rate will increase as well because there will be more collisions between particles. * If the water with Alka-Seltzer tablets are stirred during the reaction, then the rates of reactions will increase because the particles will be forced to make contact with each others and react much quicker, rather than take their time to make contact, and therefor... ... water bath could have been used, because I could set it to my required temperature. Also it would mean that the solution inside it would reach the exact temperature or close to It., and not increase or decrease once the water inside it has reached equilibration. It was also very difficult for me to observe exactly when the Alka-Seltzer tablets had totally dissolved and consistently decide this for every result obtained. This was probably the main factor that would have decreased the accuracy of my readings. To avoid this happening I would have needed to use specialized piece of equipment which would tell me exactly when the tablet was dissolved Overall, I can come to firm conclusion from my results that support my prediction and background knowledge that: As the temperature increases, less time will be required for a reaction to take place i.e. the rate of reaction increases. To improve the experiment overall I could use distilled water to avoid inaccuracies related to the hardness of tap water. I believe I should get a straight line curve. Another improvement I could have made is to increase the range of the temperatures investigated. (10Â °C to 100Â °C).

Kale in Kenya- Ag Issue 2012 Essay

Jonathan King Ag 101 September 16, 2012 Current Issues in Horticulture- Kale in Kenya I am going to go into the Horticultural field and one of the issues facing horticulture today is solving world hunger. Kenya is a nation that mostly lives in poverty, The United States and other countries are trying to help the Kenyan poverty problem by researching different food that can grow there along with trying to improve the food that they already have. A big crop in Kenya is kale because it costs so little to produce and the name sakuma wiki the Kenyan name for kale loosely translated means that it can sustain people throughout the week due to its extreme affordability, particularly for those who earn a dollar and below a day. The kale in Kenya is poor quality and it yields easily to diseases like black rot and leaf spot. Through a collaborative research project investigating the poor quality of kale seeds in parts of Kenya a team found that the best kale plants in Kenya originate from Kinale, a forested region north of Nairobi on the edge of the rift valley. The plants were then took to the Kenya Agricultural Research Institute and propagated to obtain clean, disease-free seed. Five lines of kale were developed and two of them did very well once the seed was tested in different parts. The propagated seed flowered later thus making the crop produce longer and had a better color with a sweeter flavored leaf. By using Horticulture the problem of hunger in Kenya is being addressed by diversifying kale to improve food and nutrition and to improve the economy by making a better plant that people would want to buy and eat.

Meaning and Origin of the Surname Roberts

A patronymic surname translating to son of Robert, from the Welsh given name Robert, meaning bright fame. The surname is derived from the Germanic elements hrod meaning fame and beraht meaning bright. The origin of the name Roberts is  Welsh and  German and is the 45th most popular surname in the United States as well as the sixth most common surname in Wales. Quick Facts The nickname for Robert is typically Bob or Bobby while the feminine form is often Roberta or Bobbi.The Normans historically introduced the surname Roberts to Britain allowing it to be popular in places like England, Wales and Ireland.Roberts can also be attributed to the Italian root connected to Rupert and is connected to Flanders by the names Rops and Rubbens.The popular fictional character and childrens toy doll, Barbie, is also known by her full name as Barbara Millicent Roberts. Alternate Surname Spellings RobertRobartsRobinsRobartRopartzRobbertsRopertRuppert Famous People Julia Roberts:  American actress popular for films Pretty Woman, Steel Magnolias, and Erin Brockovich. She is one of the highest-paid actors in Hollywood.Rick Ross:  His real name is William Leonard Roberts II. Rick Ross is a rapper and label boss who was first signed to P. Diddys Ciroc Entertainment.Doris Roberts:  Famous television actress known for her role in the popular series Everbody Loves Raymond. She had also been on Desperate Housewives, Greys Anatomy and other TV shows. Genealogy Resources 100 Most Common U.S. Surnames Their MeaningsSmith, Johnson, Williams, Jones, Brown... Are you one of the millions of Americans sporting one of these top 100 common last names from the 2000 census?Roberts Family Genealogy ForumSearch this popular genealogy forum for the Roberts surname to find others who might be researching your ancestors, or post your own Roberts query.FamilySearch - Roberts GenealogyFind records, queries, and lineage-linked family trees posted for the Roberts surname and its variations.Roberts Surname Family Mailing ListsRootsWeb hosts several free mailing lists for researchers of the Roberts surname.Cousin Connect - Roberts Genealogy QueriesRead or post genealogy queries for the surname Roberts, and sign up for free notification when new Roberts queries are added.DistantCousin.com - Roberts Genealogy Family HistoryFree databases and genealogy links for the last name Roberts. Check out the resource First Name Meanings to discover the meaning of a given name.  Suggest a surname  be added to the Glossary of Surname Meanings and Origins if you are unable to find your last name listed. Source Cottle, Basil. Penguin Dictionary of Surnames. Baltimore, MD: Penguin Books, 1967. Menk, Lars. A Dictionary of German-Jewish Surnames. Avotaynu, 2005. Beider, Alexander. A Dictionary of Jewish Surnames from Galicia. Avotaynu, 2004. Hanks, Patrick, and Flavia Hodges. A Dictionary of Surnames. Oxford University Press, 1989. Hanks, Patrick. Dictionary of American Family Names. Oxford University Press, 2003. Smith, Elsdon C. American Surnames. Genealogical Publishing Company, 1997.