carbon-12 atom Orbital a region that can hold up to 2 electrons with opposite spins 1st ionisation energy energy change when one mole of electrons is removed from one mole of gaseous atoms 2. Equations and acids Acid proton donor (H+ donor) Base proton acceptor (H+ acceptor) Salt produced when the H+ of an acid is replaced by another positive ion 3. Redox Oxidation loss of electrons or increase in oxidation number Reduction gain of electrons or decrease in oxidation
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sure to include the units. NOTE: Any four questions from this HW will be graded, and the marks for this HW will be based on these only. (1, 2, 3, 12, 13, 18, 19, 21, 22, 29, 31, 32, 44) 1. A proton beam in an accelerator carries a current of 125 A. If the beam is incident on a target, how many protons strike the target in a period of 23.0 s? 2. A copper wire has a circular cross section with a radius of 1.25 mm. (a) If the wire carries a current of 3.70 A, find the drift speed of the electrons
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Cl2. Elementary Particles Atoms are made up of smaller particles called protons, neutrons and electrons. The protons and neutrons cluster together in a small nucleus at the centre of the atom while the electrons orbit the nucleus. The main properties of the particles are: |Particle |Mass |Charge | |PROTON |1
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Development in the Study of Atomic Structure Bohr’s and Rutherford’s Contributions Mihret Gelan 17th September 2014 Word Count (title page & references excluded): 1459 Atomic Theory & Structure "By convention sweet, by convention bitter, by convention hot, by convention cold, by convention color: but in reality atoms and void." Those are the words of Democritus, one of the founding fathers of the ancient atomic theory, on his philosophical viewpoint on the nature of matter. It began
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1-1 : Introduction :- Increased use of digital images in recent years due to the availability of echnology equipment Has made the process of dealing with images of things possible, onventional cameras are based physicist based controls Lighting by the user entering the lens by controlling the amount and direction of light, while the camera Digital not only require a simple knowledge by the user, and the principle of its work depends on converting light into Electrical discharges, and converts
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containing protons and neutrons, surrounded by electrons in shells (energy levels) ● Demonstrate an understanding that the nucleus of an atom is very small compared to the overall size of the atom ● Describe atoms of a given element as having the same number of protons in the nucleus and that this number is unique to that element ● Recall the relative charge and relative mass of a proton, a neutron and an electron ● Demonstrate an understanding that atoms contain equal numbers of protons and electrons
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and carbon (C). 3. What subatomic particles are found in the atomic nucleus? What are their charges? a. There are three subatomic particles found in an atom’s nucleus and they are electrons, protons, and neutrons. Both electrons and protons are electrically charged, electrons are negatively charged and protons are positively charged. The neutron has no electrical charge at all, lending to its name. 4. Explain matter’s state of potential energy.
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8.1 Multiple-Choice Questions 1) According to the Arrhenius concept, if [pic]were dissolved in water, it would act as A) a base. B) an acid. C) a source of hydroxide ions. D) a source of H- ions. E) a proton acceptor. Answer: B 2) The name given to an aqueous solution of HBr is A) hydrogen bromide. B) hydrobromic acid. C) bromic acid. D) bromous acid. E) hypobromous acid. Answer: B 3) Which one of the following is characteristic of a base? A) produces [pic]in
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Summary 1 : The study of the Universe The Universe consists of the space, planets, all the different stars and other matter in it. The size of the Universe is beyond our imagination. According to astronomers a huge explosion named the Big Bang created the Universe about 14 billion years ago . There are four basic forces that control the Universe : electromagnetism, the weak force, the strong force, and gravity. The asteroids, galaxies, comets, black holes, red dwarfs, meteors, moons, planets etc
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The results would be your overall conclusion as to whether the hypothesis is true or not. According to Mader and Windelspecht, “The atomic theory states the elements consist of tiny particles called atoms” (22). Each atom has an atomic weight. Protons have a positive charge. Neutons have a neutron charge. Electrons
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