Chemistry Exam Revision - Redox & Electrochemical Series - Define oxidation and reduction in term of loss and gain of oxygen; loss and gain of electrons and change in oxidation state (number). • Oxidation is the loss of electrons; an increase in oxidation state or a gain in oxygen by a molecule‚ atom‚ or ion. • Reduction is the gain of electrons; a decrease in oxidation state or a loss of oxygen by a molecule‚ atom‚ or ion. • OIL RIG (Oxidation is Loss‚ Reduction is Gain) - Rules for assigning
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Unit 1 – Lesson 1 Chemistry Key Questions 1. Element Standard Notation # Of Electrons # Of Protons # Of Neutrons Sodium 23 11 Na 11 11 12 Chromium 24 Ca 26 26 27 ? Phosphorus 32 P 15 15 16 2. Fireworks; Which metals burn to produce these colours? Red – Lithium (Sr) Blue – Cesium (Cs) Pink – Potassium (K) Yellow/Green – Copper (Cu) Orange – Carbon (Ca) 3. Let’s say that the three bottles contain Fe(NO3)3‚ BaCl‚ and AgNO3. These are Iron (III) Nitrate‚ Barium Chloride
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production of yams is their main economic source. Yam production is almost entirely done by the males in the society. Once a year men harvest a large amount of yams. Even though men control and do most of the work while harvesting the yams‚ women also play a part in the harvesting and production of yams. Women do this by helping the men cultivate the soil to prepare for the planting of the yams. Yams have a political significant in the fact that fathers prepare a yam garden for their daughters to receive
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Why we believe what we see? Actually‚ the real reason why our eyes deceive us is that our eyes function in our brains. The eye is quite a complex part of the body. There are more than a billion parts work together in the same time. The vision is an important sense which is supported by the brain that receives the information from the eye. Firstly‚ as light enters the eye‚ “it passes through a thin transparent protective shield on the front of the eye”‚ which is called the cornea. The clear cornea
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Chemistry Ozone Depletion Ozone depletion describes two distinct but related phenomena observed since the late 1970s: a steady decline of about 4% per decade in the total volume of ozone in Earth’s stratosphere (the ozone layer)‚ and a much larger springtime decrease in stratospheric ozone over Earth’s polar regions. The latter phenomenon is referred to as theozone hole. In addition to these well-known stratospheric phenomena‚ there are also springtime polartropospheric ozone depletion events. The
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My opinion on why we study English lexicology How many words are there in the modern English language? There is no single sensible answer to this question. It is impossible to count the number of words in a language‚ because it is so hard to decide what counts as a word. But it is widely accepted by linguists that there are one million or so English words now. If so‚ a subject is needed to study and analyze modern English vocabulary. Thus‚ English-lexicological learning is important in some aspects
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been an irony of incredible accomplishments in the face of human tragedies. Without the study of Black History there would be no American History. African American History should be studied because America is a country built on slave labor. The African Americans were bought or kidnapped by slave traders. They were chained up and taken to North America by ships. They did not know the language‚ they did not know why they had been removed from their homes and they were sick and confused. Then they were
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JEET SCIENCE ACADEMY CHOWK AZAM (LAYYAH) TIME 2.5 Hr CHEMISTRY 1st YEAR CH # 1‚2‚9‚10 Marks: 85 G.Super . 1 Name…………………………………………...... Objective ROLL NO. ………………………………. Q.NO.1. Encircle the correct answer? (1×17=17) 1. Atoms of which one of the follelement have independent existance: (A) Flourine (B) Krypton (C ) Oxygen (D) Nitrogen 2.18g glucose is dissolved
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There are many rumours in people’s minds about why coupons or bad or useless‚ leading them to avoid using coupons. It is time to debunk these wrong assumptions and put them to rest. Here are six of the most common myths regarding coupons and why they are false: Coupons are Not Worth the Savings Some people feel that coupons only save a fractional amount of money which won’t matter anyway in the long run. Another thing people feel is that stores know you’ll use the coupons‚ so they increase prices
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Source: Chemistry by C. Mortimer PP 1-5 Chemistry by R.S. de Borja PP 1-5 Definition of Chemistry Chemistry is concerned with the composition and the structure of substances and with the forces that hold this structure together. And the changes that undergoes with the energy involved in them. History Chemistry which emerged‚ took hundreds of years to develop the history of its development can be divided ranging into five
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