Science Revision Notes Chemistry Atoms are the smallest particle of a particular element. Molecules are particles that contain 2 or more atoms joined together by chemical bonds. Elements are substances that are made up of only one type of atom. Compounds are substances form when two or more elements are joined chemically. Metals are solid at room temperature‚ with the exception of mercury. Metals are good conductors of electricity and heat. Metals can usually be melted at high temperatures. Non-metals
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Covalent Bonding In a covalent bond‚ a pair of electrons is shared between two atoms. Each of the positively charged nuclei is attracted to the same negatively charged pair of electrons. The diagram: A and B are held together by this shared attraction. Covalent bonds are often drawn as dots and crosses diagrams to show that the electrons have come from two different atoms. Molecules have a certain fixed number of atoms in them joined together by covalent bonds. Examples: Bonding in hydrogen
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Chapter 2: Atomic Structure Quantum Numbers n: principal‚ energy‚ size of orbital‚ positive integers allowed l: angular momentum‚ orbital shape‚ integers from 0 to n-1 allowed ml: magnetic moment‚ orientation in space of orbital‚ integers from -l to +l allowed ms: spin‚ shows electrons in orbital‚ ± ½ allowed Orbitals p orbital l = 1 All have a specific orientation in space (x‚ y‚ z) Electron spends equal amount of time in both lobes‚ nucleus at node Shading
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FAMILY BONDING The Norman Rockwell family gathered around the table is an image many know. The whole family happily gathered together in anticipation of a shared meal. In the essay‚ “The Magic of the Family Meal”‚ Nancy Gibbs talks about this dying tradition of sitting down with the family to share in a meal. Life is constantly happening around us and sometimes we don’t take the time to sit and enjoy the company of our family‚ the bonds it can create‚ and the benefit it can have on children. Sitting
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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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Green Chemistry – AUDI 1. What does the company sell/manufacture? Audi is a company based in Germany that designs‚ develops‚ produces and sells premium automobiles. Audi is under the control of its patent company Volkswagen. Audi has production facilities in Germany‚ China‚ India‚ Italy‚ Hungary and Belgium. 2. How has this company used green chemistry? With Audi’s current model range‚ it meets the requirements for ‘EU Directive 2005/64/EC’ with regards to their reusability‚ recyclability
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Connect the dots‚ “follow your heart”‚ “live life to the fullest”‚ these concepts have been engrained into the minds of many since childhood. Steve Jobs‚ in his commencement address‚ applies these concepts‚ not to children‚ but to the lives of Stanford graduates as they take the big step into adulthood. Steve Jobs breaks his speech into three sections and does an excellent job in discussing each of these; how to connect the dots‚ love and loss and death. As kids‚ everyone has done a connect the
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Badr Algharairi Yan Fang Violet Amoabeng What are Dippin’ Dots? Dippin’ Dots are tiny beads of ice cream‚ yoghurt‚ sherbet and flavored ice. Microbiologist Curt Jones used his background in cryogenic technology to invent Dippin’ Dots in 1988. His invention is now considered the unique‚ futuristic and fun way to eat ice cream! Dippin’ Dots Inc. is a PRIVATE company. How Are Dippin’ Dots Made? Dippin’ Dots are beads of cryogenically frozen ice cream. They use a combination of natural
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Honors Chemistry Notes Unit 1 • Matter- Anything that has mass and volume and anything that has the property of inertia. -Quantitative. -Can be solid‚ liquid‚ gas. • Inertia- Ability to resist changes in its motion. -Change in motion could be terms of speed or distance. -A car that moves after it has stopped. • Mass- The amount of matter in an object. -The balances that you use in laboratory measure mass‚ not weight. -SI unit is kilogram (kg). • Conservation of Mass- The law states that
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Dot Jot notes The use of historical facts like the invention of the gunpowder‚ the reference to the “Phoenicians”‚ “the idea of 0” and other such facts play an essential role as these facts make the essay more attention-grabbing. Readers may feel interested in the essay because of the fascinating facts presented by the author. Moreover‚ using facts in the essay gives the reader the idea that the author is well aware of the topic and has credible and trustable information to offer. Using generalisation
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