Rates of Reaction Essay Example for Free

Rates of Reaction Essay An enzyme is a protein molecule that helps other organic molecules start chemical reactions with one another; however, the enzyme itself is not affected by the reaction. A substrate is the substance acted upon by the enzyme. In this lab, catalase is the enzyme and hydrogen peroxide is the substrate. Catalase is found in both plant and animal tissues, and is abundant in plant storage organs. In this experiment, catalase is used from potatoes. Catalase is important to living things because it prevents the accumulation of hydrogen peroxide in the cell. Hydrogen peroxide is produced naturally as a byproduct of metabolism. It tends to disrupt the cells’ chemistry, too much can kill a cell. Therefore, the presence of catalase is needed to survive. Catalase breaks down the toxic hydrogen peroxide into harmless water and oxygen. If the concentration of the substrate hydrogen peroxide is related to the reaction rate of the enzyme catalase, then an increase in the concentration of hydrogen peroxide will increase the reaction rate of catalase. Catalase: Methods and Materials In order to experiment and determine the affects concentration has on reaction rate, you will need several materials. Such as, potato extract, crushed ice and water in a large beaker to keep the catalase cool, since catalase is sensitive to temperature. Hydrogen peroxide solution is needed at six different concentrations (10%, 25%, 40%, 60%, 75%, and 100%). Also, 0% hydrogen peroxide is needed, which is just simply water. In addition, you will need a 10 ml graduated cylinder, a 50 ml beaker, forceps, paper dots (Whatman #1 filter paper, 1 cm diameter), a paper towel, a stopwatch, and graph paper. During this lab, be careful of the hydrogen peroxide because it can damage skin and clothes. Be sure to immediately rinse and spills with water. Throughout the lab, always keep the potato extract in the ice-water bath; catalase is very sensitive to warm temperatures. For starters, 0% hydrogen peroxide was tested as the control group; 10 ml of hydrogen peroxide was measured of using a graduated cylinder. This sample is then poured into a 50 ml beaker. After swirling the potato extract, using forceps a paper dot is picked up and immersed into the potato juice for five seconds. Then the dot is drained on a paper towel for 10 seconds. Using the forceps the dot is picked up and placed in the bottom of the beaker containing the hydrogen peroxide solution. Soon the dot was expected to rise to the surface because the potato juice’s catalase would break down the hydrogen peroxide into water and oxygen. The oxygen gas gets trapped in the pores of the paper and caused to float. A stopwatch was used to measure the time in seconds from when the dot touched the solution until it reached the surface. The data was then recorded. The class was split into groups and each group was assigned a different percentile of hydrogen peroxide solution.

How the Vietnam War Effected the American People and the American Presi

?The Vietnam War was fought during 1960 to 1975. It began as an attempt by Communist guerrillas?in the South to overthrow the ?government of South Vietnam. The struggle widened into a war between South Vietnam and North Vietnam and ultimately led to a international conflict. The United States and some 40 other countries supported South Vietnam by supplying troops and the?USSR and the People's Republic of China furnished munitions to North Vietnam and the Vietcong. ?Despite the massive American aid, the VC numbers continued to increase. By November 1961, the VC fighting forces had grown from the ?2,000 fighters that had been left after Diem's ruthless anti-Communist ?campaign in 1957, to nearly 16, 000. Regardless of American weapons and money, the VC was winning the support of the villagers.?The US military response to the deteriorating position in South ?Vietnam was to apply more military force. The Joint Chiefs of Staff?wanted six US divisions and 200,000 men sent immediately to So uth ?Vietnam. In response, Kennedy refused to send in US?ground forces. Under Kennedy, the US commitment remained at an?advisory level. On November 22 of 1963, a tragic event took place. President John F. Kennedy was shot and killed while riding in a limousine through the streets of Dallas. The same day, Deputy Lyndon B. Johnson was sworn in as President. Johnson further increased the number of ?advisors and equipment being sent to Vietnam. He wanted to declare war, destroy North Vietnam and Communism as soon as possible, even if ?he had to sacrifice his plans for a ?Great Society.? ? Losing the Great Society was a terrible thought, but not so terrible ?as the thought of being responsible for America's losing a war to the ?Communists. Nothing co... ... the right thing, and the ?US had a right to stop what it thought was wrong. In conclusion, I believe that the Vietnam War had a massive impact?upon US society and domestic politics. The war bitterly divided the ?nation and caused protests and political conflict between supporters ?and opponents. It ruined Johnson's chances of being re-elected ?president in 1968 and even damaged Bill Clinton when he stood for the ?presidency in 1992. It may be that after more than 20 years the war ?now causes fewer problems in the United States. But some of the ?effects of the war have remained. The Pentagon Papers proved that ?American governments had misled the people and even lied to them about ?the war. As a result, many Americans are much less willing to believe ?what their government tells them. Today, governments won't win back the?trust of these Americans that easily.

Unended War and Intervention in Iraq

Iraqi people might find already immuned of the uproar in different areas in Iraq. The tragedies that were happened more than two decades ago and are still happening nowadays are really marked the history of Middle Eastern conflict. Such bombings, bombarding, invasion, and protests are really taken the big part of the history of Iraq.It was during 1980 when the Iraq tried to invade the Iran, but of course, the Iran did not let it happen(Shalom, 1993). Though the Iraq made its initial success, the people of Iran used their man power as many population they have.At the middle of the 1982, the Iran was triumphant with their goal of pushing out the invasion of Iraq. But considering the fact that Iran has much weaponry, they were able to prevent the moves of the Iranian, and it was year 1988 when the silence screams of the gun and war men were off heard.However, though the war was ended (temporarily), the blame was on the both government of the two countries when in Saddam Hussein was the one who was ruling the Iraq. Letting the bloodshed among Iraqi citizens was considered as one of his callous in leading   his constituents.This was the time when the United States (US) started to intervene so as to help out the Iraq in settling the untapped war that had been started before and to help the people of Iraq to recover from the hell of war and from the ruthless government of Hussein.The US sent military troops in Iraq whereas they created several bases in different regions in Iraq. And nowadays, the US is continuing lurking around the Iraq. They are doing they ‘surge’ (Reuters, 2007) together with the British troupes. According to the report of the Philippine Daily Inquirer (2007), the rush forward being done in Iraq is nearly unsuccessful such that an insurgency is more likely to happen again.The critical condition of the mission of the US in the Iraq together with the British government pertained that war between the Hezbollah and Israel last August 2006 . The war between them was hardly to ceasefire. The criticism of the event is more likely on former Prime Minister Tony Blair since he was the one who refused for a call of an immediate stop fire between the Israel and Hezbollah (Lebanon) in their war last year.I have chosen this event to be use as application in theoretical analysis since this is widely known by everybody and that the lives of the people living in the countries involved are severely affected by the war that is happening.(Part B)The clash between Iran and Iraq seemed more likely though during the early 90s. However, since the Iraq was suffered under the Hussein’s regime, lots of militant groups and civil underground rebels emerged and rebellion took place.And it is in nature of the United State, being considered as the most powerful country in the world, to help, in any way, those who are in depth recovery of the war. But in the case of Iraq, the peace seemed not finding its place. Until now, clashes are stil l going on, but not necessarily war against another nation, but war among civil there.The surgency that the US has been doing and trying to imply in the Iraq, does it really pure surgency? As we all know, the US is one kind of imperialist in the world. Widely, it colonized a lot of country in Asia, explicitly and implicitly. Once one touched the hand of Uncle Sam, you would definitely touch it along the way.The reason why Iraq still has its internal conflict between civilians is not because they rebel with each other, it may probably because of the intervention of the US in their nation. Come to think of it: whose nation would like to handle by different hands instead the hands of its people?Politically speaking, this could be a way of euphemizing the real intention of the US. We could deny the fact that the US wanted to hold more power, and imperialism is the instrument and effective tool for them to accomplish their goal.

History Timeline - 1078 Words

Henry VIII: Authority, Nation and Religion, 1509- 1540 1473: Wolsey born in Ipswich, son of a butcher, gained a scholarship to Oxford 1485: Henry VII becomes King of England after defeating Richard III at the Battle of Bosworth 1491: Henry VIII born at Greenwich Palace 1498: Wolsey Ordained as a priest 1501: Arthur, Prince of Wales and Catherine of Aragon married 1502: Arthur dies Wolsey made Chaplain to Archbishop Deane of Canterbury 1503: Pope Julius II grants dispensation for Henry and Catherine’s betrothal 1507: Wolsey appointed chaplain to Henry VII 1509: Wolsey appointed Dean of Lincoln and Royal Almoner (dispenses money to poor) 21st April: Henry VII Dies 11th June: Henry VIII Marries Catherine Of†¦show more content†¦January-March: First parliamentary session; Acts for the Submission of the Clergy, in Absolute Restraint of Annates, forbidding Papal Dispensations and payment of Peter’s Pence. Succession Act. November: Second Parliamentary session; Acts of Supremacy. Act annexing First Fruits and Tenths to the Crown. Treasons Act. 1535: May: Leading Carthusians executed June: Bishop John Fisher executed July: More executed Valour Ecclesiasticus, the Royal visitation of the monasteries 1536: Act for the Dissolution of the Lesser Monasteries Ten Articles published Cromwell issues issued first set of Royal injunctions January: Catherine Of Aragon Dies May: Anne Boleyn Executed October: Pilgrimage of Grace 1537: October: Prince Edward born/ death of Jane Seymour Bishops’ BookShow MoreRelatedHistory Of Education : Timeline1990 Words   |  8 PagesHistory of Education - Timeline 3100BC The goal of education in the Greek city-states was to prepare the child for adult activities as a citizen. The goal for the Greeks was to find spiritual satisfaction in the ordinary everyday role. The goal of education in Sparta, an authoritarian, military city-state, was to produce soldier-citizens. 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