Observing with a Compound Lens Microscope Grade 10 Biology Objective Students will be able to bring into focus the lens on a compound light microscope and make an accurate observation of a plant cell. Standard State Science Framework: Students will be able to use the tools of scientific inquiry. Procedures Clarify Goals and Establish Set Tell students that today they are going to learn how to focus a lens on a compound light microscope and how to make an accurate
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Microscopes were invented in the 1600s. Robert Hooke first looked at a thin slice of cork in 1665; he saw "a lot of little boxes." These little boxes first reminded of the little rooms monks lived in‚ so he called them cells. Hooke observed the same pattern in the stems and roots of carrots and other plants. What Hooke still did not know‚ however‚ was that cells are the basic units of living things. Ten years later‚ the Dutch scientist Anton van Leeuwenhoek focused a microscope on what seemed to
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the atom and of covalent and ionic bonding that students have used so far emphasizes the attractions between bonding atoms. The nucleus‚ electrons‚ and double-headed arrows show that the protons and electrons from one atom attract the oppositely charged electrons and protons of the other atom‚ resulting in bonding. The energy levels show that only valence electrons are involved in bonding. After students understand the important role of attraction of opposite charges‚ you may introduce them to a common
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03.04 Valence Electrons and Bonding Individual neutral atoms are rarely found in nature. The noble gases are the only elements that are found as single atoms more often than they are found in compounds. Atoms are held together in compounds by electrostatic attraction between positive nuclei and negative electrons. This attraction holds atoms together in a chemical bond‚ a link between two atoms resulting from the mutual attraction of their nuclei for valence electrons. All chemical bonds involve
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1. Provide a comprehensive description of the experiment Thomson used to discover the electron. Thomson was experimenting with electric discharges in electric discharge tubes when he found that it would glow when a high voltage was applied in a gas volume at low pressure‚ while it was known that the glow in the gas was something to do with the cathode and the negative pole of the high voltage‚ Thomson continued with his experiments with the rays coming from the cathode and he found that the rays
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Name: ______________________________________ Date: ________________________ Student Exploration: Electron Configuration Vocabulary: atomic number‚ atomic radius‚ Aufbau principle‚ chemical family‚ diagonal rule‚ electron configuration‚ Hund’s rule‚ orbital‚ Pauli exclusion principle‚ period‚ shell‚ spin‚ subshell Prior Knowledge Questions (Do these BEFORE using the Gizmo.) 1. Elvis Perkins‚ a rather shy fellow‚ is getting on the bus shown at right. Which seat do you think he will probably
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Famous Canadian Entrepreneurs James Hillier and Albert Prebus (Electron Microscope) James Hillier‚ one of the entrepreneurs of the electron microscope‚ was born on August 22nd‚ 1915 in Brantford‚ Ontario. He attended the University of Toronto‚ where he received a PhD in 1941. After graduating‚ Hillier spent most of his career at the Radio Corporation of America (or RCA)‚ discovering the principle of stigmator‚ which is used to correct astigmatism in a microanalyser‚ while being the first person
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magnetic field of coil which electric current is passed. 1 . I started to work with Dr Knoll in 1931 on electron microscope. After working hard for three years. In 1933 I was able to put into use electron microscope by myself which works much better then Light Microscope. 2 In 1928 Max Knoll and I worked together to make a microscope which we successfully discovered a Electron microscope which magnified object only up to 17 times bigger than actual size. In 1937 Canadian American scientist
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nature of information to be extracted‚ can be accomplished using an Optical Microscope (up to X2000) or Scanning Electron Microscope (up to X 50000) or a Transmission Electron Microscope (up to X500000). For most of the routine purposes in optical microscope is used to obtain first hand information on the geometric arrangement of the grains and phases in a material. In order to retain the information visualized using the microscope‚ microstructural details are often recorded on a 35 mm film or a Polaroid
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Name _________________________________________ Date _________________________ Period ____ Homework Chapter 7: Electronic Structure of Atoms Exercises: Sections 7.4‚ 7.5 : Ionization Energy and Electron Affinities 1. Write equations that show the process for (a) The first two ionization energies of gallium; first: Ga(g) → Ga+(g) + 1 e– second: Ga+(g) → Ga2+(g) + 1 e– (b) the fourth ionization energy of rhodium. fourth: Rh3+(g) → Rh4+(g) + 1 e–
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