Changes of several household chemicals Essay Example for Free

Changes of several household chemicals Essay REACTIONS OF SUCROSE WITH WATER AND HEAT Mixture/Solution Process Observations Sand, salt and water none -salt dissolves in water -some san   particles settle at bottom, others float in suspension -mixture is murky Sand, salt and water filtration -residue is sand -filtrate is salt water Salt water evaporation -solute is salt -solvent is water -water evaporates -salt is left in dish -salt is white forming a layer or crust. OBSERVATIONS OF THE MIXTURE AND SEPARATION OF SALT, SAND AND WATER Residue/Solute Observations Sand (residue) -brown color -large and small particle sizes moist -grain-like composition Salt (solute) -white color -tiny particle sizes -particles sticked together to form crust -dry -crystal-like composition COMPARISON OF SALT SOLUTE AND SAND RESIDUE Compound Condition Change Silver Nitrate Dark (locker) None Silver Nitrate. Exposed to light -turned copper brown color -black edges around brown -paper was dry REACTIONS OF SILVER NITRATE IN LIGHT AND DARK CONDITIONS Compounds Change after grinding Change with magnet Iron filings and Sulphur powder poweders mix together turns olive green color iron filings attract to magnet sulphur poweder remains unchanged OBSERVATIONS OF IRON FILINGS AND SULPHUR POWDER AFTER GRINDING AND MAGNET ATTRACTION DISCUSSION: In this lab the physical and chemical properties of given substances were investigated along with the determination of chemical/physical changes observed in certain mixtures. Separating methods were also used to separate certain mixtures. As a result, these three objectives were completed successfully. In the first experiment, a 2cm magnesium ribbon was added to 4ml 3M of hydrochloric acid. The resulting reaction caused the mixture to fizz and dissolved the magnesium strip. This was found to be a chemical change due tot eh fact that an acid (HCl) reacted with a metal (Mg). From the reaction the magnesium dissolved due to the production of hydrogen (white gas visible) in the test tube; moreover, the magnesium was converted into aqueous magnesium chloride and thus no solid was visible after the reaction. The second experiment, in which 2 test tubes were filled with sucrose, one also with water and the other heated, showed two distinct characteristics of table sugar. When water and the sucrose were stirred it was observed that the sucrose molecules dissolved into the water. This physical change occurred due tot eh fact that the sugar, acting as a solute, dissolved into the solvent, water, in turn forming a homogenous mixture that was uniform throughout. Also, the fact that no chemical means is needed to separate such a solution proves that it was a physical change occurring. Secondly, when the sucrose was heated it was observed that after a certain amount of time, the sucrose melted and turned color. This was due tot eh fact that sucrose has a low melting point and it reached this point in the experiment thus causing it to change state. This was seen as a physical change as well due to the fact that the identity of sucrose was not changed chemically, only its state. As the third experiment was conducted, a mixture of sand, salt and water was combined and separated to observe any sort of change. When the three substances were combined it was found that the salt dissolved in the water while the sand remained the same. The salt again, acted as a solute and the water as a solvent thus producing a homogenous solution and a physical change in the salt; however, because the sand did not dissolve into the water, it was concluded that the sand particles floating in the water formed a suspension (mixture in which each substance keeps its own identity and characteristics). When filtration was performed the sand was left on the filter paper a residue while the filtrate of salt water was found in the beaker. The sand particles were too large to fit in the spaces of the filter paper and thus could not pass into the beaker, but the filtrate of salt and water, because it was a liquid solution, it passed with ease. After evaporation was complete, the solvent was evaporated and only the salt was left in the dish. This was so because the water had a lower boiling point that salt and thus evaporated into the atmosphere and left the salt to collect in the dish. This was found to be another physical change due tot eh fact that salt was returned to its original state. The next experiment involved the reaction of silver nitrate with both light and dark conditions. The silver nitrate in the dark did not show any change at all, but the one exposed to sunlight showed significant chemical change. The fact that it turned copper brown and black edges proved that silver nitrate is very sensitive to light. Because the light hit the silver nitrate it reacted with positive silver ions reducing them to silver metal. This caused the darkened areas on the paper that were observed. Lastly, when iron filings and sulphur powder were mixed it produced an olive green powder. This physical change occurred due to the fact that there was no reaction between sulphur and iron filings thus both remained unchanged but mixed. When the magnet was passed over the powder all iron filings, due to their metallic attraction to magnetic fields, all iron filings attached themselves to the magnet leaving only sulphur powder again. Sources of error may have included the fact that the wafting of certain substances for odors were faulty in the view that the scent was so mild it could not be detected easily with olfactory senses; moreover the actual process or reaction of silver nitrate with light was not observed in step by step detail resulting in some uncertainty or poor clarity in results. Nevertheless, the conclusions were reliable due to the fact that each experiment was carried out in a systematic and precise way. Also, the fact that all results matched theoretic values and prior knowledge of the reactions occurring proved their acceptability in the lab. CONCLUSION: All objectives were achieved successfully as several experiments were conducted to prove their reactions and changes. The first reaction with baking soda and vinegar was a chemical change due to the fact that the solution fizzed forming a new one and gas evolved thus outing the splint. The second reaction of HCl and Mg was chemical as well because magnesium dissolved and hydrogen gas evolved (both results of a chemical reaction between magnesium and HCl). The third conclusion drawn was the fact that sucrose mixed with water was a physical change. This was so because even though the sucrose dissolved it did not change chemically and could have been separated from the water back to its original form; moreover, when sucrose was heated it was another physical change as it changed state but remained the same compound, sucrose. Physical changes were also observed in the sand, salt and water mixture. The salt was ultimately extracted from the water through evaporation proving it was a physical change. After this, when the silver nitrate was placed in the sunlight a chemical change occurred as light reacted with silver ions thus changing the color of silver nitrate. Lastly, a final physical change was observed in the grinding of iron filings and sulphur powder because when the magnet attracted iron filings it showed that the iron did not change its identity but only mixed in with the sulphur powder. Anuar Flores CHE 124-1 Show preview only The above preview is unformatted text This student written piece of work is one of many that can be found in our GCSE Patterns of Behaviour section.

Hawthornes Brilliant Mind Essay -- Literary Analysis

Whenever reading a short story or novel, sometimes many questions pop into the mind wanting to know why the author writes in that particular fashion. In each circumstance, every author has a motivation that fuels them into their writing styles. For Nathaniel Hawthorne, influences came from every direction. Born from a puritan father, Hawthorne was always taught that god was the number one priority in his life. That he should always follow the rules and live without guilt or sin. When his father died at age 4, Hawthorne became increasingly interested in literature and was inspired by Spenser, Bunyan, and Shakespeare (Pennel 2). These authors had a significant influence on Hawthorne’s style as a writer (Pennel 2). For his Puritan heritage and his personal experiences influenced Hawthorne in his short story â€Å"Young Goodman Brown,† and his novels The Scarlett Letter and The House of the Seven Gables. One of the biggest influences of Hawthorne’s writing was his Puritan heritage. During the late 16th and 17th century, a group of people sought to â€Å"purify† the Church of England of remnants of The Roman Catholic â€Å"popery† left over from Queen Elizabeth’s I reign (Encyclopedia Britannica). The puritan people believed that one must be in convention with god in order to redeem one from one’s sinful condition. Later this reformation was an essential building block when founding colonies in America and establishing the Puritan way of life. Hawthorne’s great-great-grandfather father, John Hathorne was a Puritan and was one of the founders of the Massachusetts Bay colony in the 1630s (Pennel 2). So for Nathaniel Hawthorne, his Puritan heritage can be traced back to one most important people to have settled in America and establish his influence t... ...l about his interesting life. Works Cited Marks, Patricia. â€Å"Critical Survey of Long Fiction, Fourth Edition† Salem Press: p1-10. Literary Reference Center,. Web 8 May 2012 "Nathaniel Hawthorne (1804-1864)." Short Story Criticism. Ed. Sheila Fitzgerald. Vol. 3. Detroit: Gale Research, 1989. 152-197. Literature Criticism Online. Gale. Glendale Community College. Web 8 May 2012 Pennell, Mellissa McFarland. Student Companion to Nathaniel Hawthorne. Westport: Greenwood Press, 1999. Print Pfister, Joel. The Production of Personal Life. Class, Gender, & the Psychological in Hawthorne’s Fiction. Stanford: Stanford University Press, 1991. Print "Puritanism". Encyclopà ¦dia Britannica. Encyclopà ¦dia Britannica Online. Encyclopà ¦dia Britannica Inc., 2012. Web. 08 May. 2012 Terence, Martin. Nathaniel Hawthorn. Revised Edition. Boston: Twayne Publishers. 1983. Print

Recognizing Organizational Culture in Managing Change Essay

In order to ask lots of questions about the influence of the social system, that is to say, the surrounding conditions of the organization on its ability to soak up like a towel and gain invention of new things, a having to do with figuring out. The quality of things without measuring them with numbers research was carried out to define the measuring tool for the most important things of this particular of surrounding conditions for the recognition and acceptance of e-learning in teachers or professors(Buć & Divjak, 2016). In the development of devices that make music, the examples of the development of devices that make music were used that are designed only for research in information sciences, such as for example, the development of a measuring instrument for evaluating the performance of e-Portfolio. It is generally admitted to that educational change benefits from a supportive surrounding condition. Cultural influences are a key issue when thinking about the invention of new things and change processes. Organizational culture is a key factor that influences instructional inventions of new things that the success of any something big and important that changes people’s thinking or lives effort may well depend on the extent to which organizational culture issues can be talked to(Zhu & Engels, 2014). Previous research has examined the influence of organizational culture on organizational inventions of new things. Studies point to new things is most likely to happen in organizations that have integrative structures draw attention to many different kinds of people or things, and team effort and teamwork. Yet the findings of the previous research are mixed with little believable information that proves something related to the role of specific organizational culture features in adopting instructional invention of new things in college. Students who come to a related to school and learning library meet with a variety of spaces that influence their learning and behavior. The library has two types of spaces which are shared and social. Shared spaces are places where students are involved in single, hardworking with schoolwork, and thoughtful study surrounded by other students. Students work at group and noisy work with other students in social spaces. The idea of library spaces for different types for different student needs and supports the idea which is that students need separate spaces for the types of learning and behavior connected with the ability to create interesting new things and invention of new things (Bieraugel & Neill, 2017). Ideas of library space when designing learning spaces in a library is extremely important to think about what types of behavior the design will bring out. Library design, as seen through the lens of the science of nerves and the brain, is interesting and suggests/says that library space is just like productive research surrounding conditions in helping the ability to create interesting new things and invention of new things. Bennett notes that Google, Twitter, Facebook, and other companies also aim to create productive research surrounding conditions within settings to help grow invention of new things and critical thinking be it in the lobby or a quiet corner. Environmental education can help increase problem-solving skills, very important thinking and action-oriented in relation to central and practical problems that are combined in nature(Fauville, Lantz-Andersson, & Sà ¤ljà ¶, 2014). Co-operative processes of question or investigation into an action on real related to surrounding conditions or the health of the Earth issues where students should be put in the position of active thinkers prepared to act in response to issues in partnership with fellow students. Such learning also involves understanding how to approach, plan and analyze complex issues and where to turn for clearly connected or related knowledge, and not only the reproduction of what is already known although in different difference fields of study. In such settings, student-active and problem-based instructional approaches have been argued as providing a good big picture in which to develop knowledge. So, the science of teaching and way of thinking behind environmental education can be thought of as challenging traditional approaches to schooling, which focus on learning of true knowledge presented in the classroom by the teacher in order to solve problems with an already existing, single and correct solution. Traditional education is also highly broken-up in terms of fields of study and is based on abstract problems, with students put in the rather allowing something to happen without reacting or trying to stop it a position of simply reproducing information and standard procedures.

ESL Beginner Reading Comprehension A Busy Day

In this dialogue, you will practice speaking about daily routines, as well as what is happening around the present moment in time. Notice that the present simple is used to speak about daily routines, and the present continuous is used to speak about what is happening around the current moment in time. Practice the dialogue with your partner and then interview each other focusing on changing between a discussion of daily routines and what you are currently working on. A Busy Day (two friends speaking in a park when they meet each other jogging) Barbara: Hi, Katherine, how are you today?Katherine: Im great and you? Barbara: VERY busy! Im jogging now, but later I have to do a lot!Katherine: What do you have to do? Barbara: Well, first of all, I have to do the shopping. We dont have anything to eat at home.Katherine: ... and then? Barbara: Little Johnny has a basketball game this afternoon. Im driving him to the game.Katherine: Oh, how is his team doing? Barbara: Theyre doing very well. Next week, theyre traveling to Toronto for a tournament.Katherine: Thats impressive. Barbara: Well, Johnny likes playing basketball. Im happy hes enjoying it. What are you doing today?Katherine: Im not doing much. Im meeting some friends for lunch, but, other than that, I dont have much to do today. Barbara: Youre so lucky!Katherine: No, youre the lucky one. Id like to have so many things to do.