decomposes to form a proton‚ which is retained in the nucleus‚ and an electron‚ which is expelled from the atom. Which change describes a process of this sort? A 11C 12C B 22Na 22Ne C 32P 31P D 40K 40Ca 5. How many electron pairs‚ with principal quantum number n = 3‚ can be accommodated in an atom? A 6 B 9 C 14 D 18 6. The first ionisation energies‚ in kJ mol-1‚ of Group II and III elements are given below: Group II Group III Be 900 B 799 Mg 736 Al 577 Ca 590 Ga 578 (a) Define
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constant magnetic field. Dark Matter A form of matter that is not like ordinary matter and is not described by the standard model. Electron Accelerator A particle accelerator that is designed to speed up electrons. Flavor A set of quantum numbers that identify the type of particle it is. Gravity Gravity is the force that pulls on us at all times. Without gravity we would fly off the Earth. Hertz A unit of frequency. Ion An atom that has an electrical charge that is not
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CHEMISTRY Guess Paper – 2013 Class – XI Subject - CHEMISTRY MAX MARKS=90 ……………………………………………………………………………………… General instructions: All questions are compulsory. Marks for each question are indicated against it. Questions number 1to 8 are very short –answer questions‚ carrying 1 mark each. Answer these in one word or about one sentence each. Questions number 9 to18 are short –answer questions‚ carrying 2 marks each. Answer these in about 30 words each. Questions number19 to27
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objects into their lives through what is created by one’s thoughts and energy. To change a way of life‚ one must change his/her way of thought. The Law of Attraction proves to be the most powerful law in the universe‚ as is shown through the study of quantum physics and the relationship between the flow of energy into and out of the body. If humans learn to manifest the energies of the universe and one’s own being in a proper manner‚ we will be able to accomplish everything our hearts desire‚ according
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COE CHEMONE Reviewer for CHEMONE Finals Rules for Counting Significant Figures 1. Nonzero integers. Nonzero integers always count as significant figures. 2. Zeros. There are three classes of zeros: a. Leading zeros are zeros that precede all the nonzero digits. These do not count as significant figures. In the number 0.0025‚ the three zeros simply indicate the position of the decimal point. This number has only two significant figures. Note that the number 1.00 _ 102 above is written in exponential
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Name:____________________________ Date:_____________________ Period:_______ Chemistry Chapter 5 Review: 1. How does the energy of an electron change when it moves closer to the nucleus? 2. The principle quantum number indicates what property of an electron? 3. What shape are s orbitals and p orbitals? 4. What is the maximum number of f orbitals in one energy level of an atom? 5. What is the maximum number of d orbitals in one principal energy level of an atom? 6. What is the maximum number
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Newton’s knowledge is crucial in the understanding of gravity for modern physics. Albert Einstein‚ a key figure in modern physics‚ develops and publishes the Theory of Relativity to describe the non-mechanical state of the universe. After Einstein‚ quantum theory fills the void for physicists and their
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1.1 If the Sun should suddenly explode (it can’t) how long would it take for us to notice the event? * According to scientists we have at least 5-6 million years before the sun would ever die out or explode. However if a phenominon like that were to occur there are diffent theories to what might happen. It would take light from the explosion eight minutes to travel the 93 million miles from the sun to the earth. However‚ Newton’s Law of Gravity claims that Earth would suffer an immediate departature
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fail to attend either one you will be asked to complete some extra work. This will involve a detailed report and further questions. The simplest strategy is to do the lab.] Notes For the First Year Lecture Course: An Introduction to Fluid Mechanics School of Civil Engineering‚ University of Leeds. Homework: Example sheets: These will be given for each section of the course. Doing these will greatly improve your exam mark. They are course work but do not have credits toward the module
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The University of the West Indies (Mona) Department of Chemistry Preliminary Chemistry A (Chem 0901) Atomic Structure: Tutorial 2 For discussion in the week beginning September 24‚ 2012. Answers should be submitted by 9:00 am on Monday September 24‚ 2012 in the box provided. Please write your ID number and Laboratory day clearly on your script. 1. Give an expression for the Balmer-Rydberg equation in terms of wavelength λ‚ the Rydberg constant R‚ and the integers m and n where m < n.
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