Determination of the molar volume of hydrogen gas Essay Example for Free

Determination of the molar volume of hydrogen gas Essay Introduction We are going to determine the molar volume of hydrogen gas by letting known amount of magnesium react with dilute hydrochloric acid and carefully collecting the gas formed. Materials Gas syringe Hydrochloric acid, 2-molar 8 cm of magnesium ribbon Ruler Emery cloth For details see instruction form Methods We connect the equipment according to the diagram and make sure we follow the instructions carefully, and then we weigh the 8 cm of magnesium ribbon and pour the HCl into the test tube. As we are ready to start the experiment we fold the mg ribbon on the hook and put the stopper into the test tube so that when we tilt the test tube the mg ribbon can easily fall into the acid. It is important to wait for the reaction to finish completely so that the equipment returns back to room temperature. For details see instruction form. Results: Measured weigh of 8 cm mg ribbon: 0.068 g (uncertainty is à ¯Ã‚ ¿Ã‚ ½ 0.0001) Room temperature: 21.9 à ¯Ã‚ ¿Ã‚ ½C (uncertainty is à ¯Ã‚ ¿Ã‚ ½ 0.1) Room pressure: 742.5 mmHg Vapour pressure of water: 19.587 and 19.827 Vapour pressure: 19.587 + 19.827 / 2 = 19.707 1.333 x 102 x (mmHg) = Pa Convert the room pressure in mmHg into Pa: 742.5 x 1.333 x 102 = 98975.25 Pa Convert the vapour pressure of water into Pa: 19707 x 1.333 x 102 = 2626.9431 p(H2O) = 2626.9431 Pa Room pressure (Pa) Vapour pressure of water (Pa) 98975.25 Pa 2626.9431 Pa = 96348.3069 Pa p(H2) = 96348.3069 Pa p(H2) + p(H2O) = p(room) 2626.9431 + 96348.3069 = 98975.25 p(room) Calculation of molar volume for hydrogen gas at 0 C and 1 atmosphere P1 x V1 / T1 = P2 + V2 / T2 1 atm = 1.013 x 105 P1 = 96348.3069 P2 = 1 atm = 101300 V1 = 70 cm3 (uncertainty is à ¯Ã‚ ¿Ã‚ ½1) V2 = 59cm3 (uncertainty is à ¯Ã‚ ¿Ã‚ ½0.5) T1 = 21.9 à ¯Ã‚ ¿Ã‚ ½C = 294.9 K (uncertainty is à ¯Ã‚ ¿Ã‚ ½1.3466 ) T2 = 0 à ¯Ã‚ ¿Ã‚ ½C = 273 K 96348.3069 x 70 x 1 / 294.9 = 101300 x 59 x 0.5 / 273 Conclusion Evaluation: Our conclusion is that the molar volume of hydrogen gas at 0 à ¯Ã‚ ¿Ã‚ ½C and 1 atmosphere is -. We reached the conclusion by first checking the room temperature and barometer pressure. Then we looked up the values for vapour pressure of water at the actual temperature from the Hand book of Chemistry and Physics. The full reference is: Chemistry for the IB diploloma G. Neuss. Oxford UP, 2001 p.28.

Ghana: The Gold Coast of Africa Essay -- Geography

Ghana: The Gold Coast of Africa The Gold Coast, now known as Ghana, is one of many civilizations of Africa. It was a British Colony until March 6, 1957, when it became independent as the State of Ghana. In 1471, the Portuguese invaded this area and became involved in gold trade, giving the region the name, The Gold Coast. They built forts to protect their monopoly of gold trade from merchants representing other nations. In 1642, the Dutch West India Company captured all Portuguese strong posts and they devoted their interests in slave trading rather than gold trading. In the Seventeenth and Eighteenth Centuries, the Gold Coast was one of the chief West African sources of slave export. At the beginning of the Nineteenth Century the countries involved in slave trading began abolishing it as illegal and immoral. The British abolished it in 1807, the Danish is 1804 and the Dutch in 1814. In 1821, British forts were transferred from private ownership to government control. The Gold Coast became a British colony and the new government was known...

New students

Hey guys my names Is kenned melee, people usually call me Kenny . Im from Jackson n] and I attended Jackson memorial high school . 1 remember back In hollyhock my failover thing was gym and all the activates we got to play . But anyway I'm now currently attending Coco , I choose ocean county college because of the opportunities it presents. Such as the low tuition fee for one . My plan at coco is to major in broadcasting journalism Finnish my flirts year with the best grades possible and then transfer to temple university.Ocean county has taught me a few new things about my self such as how to mange my time studying , and how to mange my money well. Even though Eve learned a lot of things while at ocean the transition wasn't that smooth , I think the most difficult thing for me was having to remember my classes on my own . Its nothing Like highlights where you had the bell to remind you when class was. Or the stress of not knowing anyone In class, or not wanting to raise your hand In class because you think people might make fun of you. But Eve had a great support team.In my Cad class Eve learned so much and my teacher Mrs†¦ O explained everything charley and always offered a helping hand whenever we her students needed it. Ocean County has a lot of support services available to your disposable , Such as the student center. The student center has so many programs, clubs, and trips that inform you about what is going on in your own campus or around you. Then the one on one sessions with the guidance consoler who assist you with every question you have. Or the tutoring groups that assist with you with math , writing, science you nameIt, Coco was was built on the simple Idea to help you succeed. Another thing ocean has helped me succeed In was my learning methods. I leaned that IM an auditory and tactile learner. Which simply means I learn by hearing and doing things hands on. I also learned that I study better with the light on and with music silly but very helpful. And lastly how to mange my time wisely , buy studying in between classes. All these new things Eve learned over these past seeks have helped me with my attitude towards school. It made me realize that school isn't so bad if you Just have the tools to succeed .I now how to mange my time better, and my money, and I have the skills to study correctly for an exam. I feel like I have become an independent learner because where I started from and where I am now. Looking back at my first semester of college I think I did everything perfectly In men's of my education, I made sure I was on top of all my school work and that and every assignment. And I Intend to do everything the same next semester. I'm so lucky to have had the easy transition into college like I did with the great support system . Make it so make it count .

The Definition Of Binge Drinking Used By The Nhs And...

The definition of binge drinking used by the NHS and National Office of Statistics is drinking more than double the lower risk guidelines for alcohol in one session. The government advises that people should not regularly drink more than the lower risk guidelines of 3-4 units of alcohol for men (equivalent to a pint and a half of 4% beer) and 2-3 units of alcohol for women (equivalent to a 175 ml glass of wine). ‘Regularly’ means drinking every day or most days of the week. Binge drinking for men, therefore, is drinking more than 8 units of alcohol – or about three pints of strong beer. For women, it’s drinking more than 6 units of alcohol, equivalent to two large glasses of wine. Alcohol misuse is a significant and increasing problem†¦show more content†¦Experts said Britain’s place in the table was a â€Å"national tragedy.† The Department of Health estimates that the harmful use of alcohol costs the National Health Service around  £3.5 billion a year and 8% of all hospital admissions involved alcohol- related conditions. Heavy episodic drinking or binge drinking can lead to over 40 medical conditions including getting into fights, problems at school or work, passing out and having unsafe sex (Wechsler Nelson, 2001). Other long term effects are: liver damage, depression, brain impairment and alcohol problems later in life (McCambridge, McAlaney, Rowe, 2011; Wechsler, Davenport, Dowdall, Moeykens, Castillo, 1994). Reducing the harm caused by alcohol is therefore a priority for the Government. Excessive consumption of alcohol is a major preventable cause of premature mortality with alcohol-related deaths accounting 1.2 million hospital admissions and around 15,000 deaths in 2010 to 2011. This isn’t only a burden on individuals and families but also a drain on hospital resources and public money: every year, alcohol-related harm costs society  £21 billion. There are many contributing factors to the UK’s binge society. The scale of marketing in the UK has an estimated  £800 million on alcohol marketing, A report on alcohol by the last Health Committee highlighted the fact that 96% of 13-year-olds from a sample of 920 were aware of alcohol advertising in at least five