dominant scientific theory about the origin of the universe. It states that the universe was created from an infinitely hot and dense subatomic ball‚ which once exploded not only created energy and matter‚ but space and time itself. This is estimated to have happened around 14 billion years ago. 300‚000 years after the big bang took place the plasma of elementary particles had cooled to 3000K‚ during which atoms began to form as electrons came into orbit around protons and neutrons. It was at this point
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Lesson Plan: Electric Circuits (~130 minutes) Concepts 1. Electricity is the flow of electric charge (electrons). 2. Electric Charge is a property of subatomic particles. 3. Current is the movement of electric charge. 4. Voltage is the electric potential that exists to move a charge. 5. Power is the rate at which electric energy is flowing in a circuit. 6. Ohm’s Law: Power = Voltage x Current. 7. Resistance is a physical property that quantifies how well a charge
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electrons are positioned by electrostatic forces. This discovery dramatically changed the modern view of the atom. Thomson’s work suggested that the atom was not an "indivisible" particle as John Dalton had suggested but‚ a jigsaw puzzle made of smaller pieces. After the discovery of the electron and proton as subatomic particles J.J. Thomson had started to discover atomic theory that gave a complete explanation of atomic structure. According to Thomson protons are embedded in the atoms like a water
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Assuming you were able to isolate only a single boron atom‚ the chance that you would randomly get one with a mass of 10.81 amu is A. 0% B. 0.81% C. about 50% D. 10.81% E. 100% 5. Match the fundamental charge and mass with the appropriate subatomic particle: Charge = –1 Mass ≈ 0 amu proton proton electron electron neutron Charge = +1 Mass ≈ 1 amu neutron electron proton neutron proton Charge = 0 Mass ≈ 1 amu electron neutron neutron proton electron A. B. C. D. E. 6. A particular element has
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BIOL 101 September 15‚ 2012 Assignment 1 Chapter 1 2. What is Homeostasis‚ and why is it important? Give some examples that show how systems work together to maintain homeostasis? Homeostasis is a term used to describe an internal environment being in a state of constant conditions‚ such as constant temperature‚ pH‚ and etc. It is important because staying at an equilibrium requires the least amount of energy and provides the perfect environment for desired reactions to occur. If at any given
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2.1 The Nature of Matter 1. Within the typical atom‚ there are three subatomic particles: protons‚ neutrons‚ and electrons (as seen in the Helium atom below). Other particles exist as well‚ such as alpha and beta particles (which will be discussed later on). Most of an atom’s mass is in the nucleus‚ a small dense area at the center of every atom formed by nucleons. Nucleons are protons and neutrons. All of the positivity of an atom is contained in the nucleus‚ because the protons have a positive
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Lecture Study Guide 1) What are the parts of an atom? Where are the subatomic particles found? The atoms are the smallest units of matter with their own chemical characteristics. The atoms are divided into 2 parts. The first part is the central nucleus and the electron cloud. The central nucleus contains very heavy particles and the electron cloud contains very light moving particles. The subatomic particles are the protons‚ neutrons‚ and the electrons. They are located within the
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Chapter 2 The Chemical Context of Life PowerPoint Lectures for Biology‚ Seventh Edition Neil Campbell and Jane Reece Copyright © 2005 Pearson Education‚ Inc. publishing as Benjamin Cummings • Overview: Chemical Foundations of Biology Copyright © 2005 Pearson Education‚ Inc. publishing as Benjamin Cummings • The bombardier beetle uses chemistry to defend itself Figure 2.1 Copyright © 2005 Pearson Education‚ Inc. publishing as Benjamin Cummings • Concept 2.1: Matter consists
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frequency scale. The region of the spectrum are broadly classified into the following classes radio‚ microwave‚ infrared‚ ultraviolet‚ X-rays‚ and gamma rays. The term “radiation” means the emission of energy as electromagnetic waves or as moving subatomic particles. Gamma rays: used in cancer radiation treatments‚ come from radioactive material‚ also from supernova explosions. X-rays used in airports to look inside luggage‚ used for medical diagnostics‚ also created in stars (like our sun).Ultraviolet
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Unit 1 Assignment Chapter 1 Review Questions DIRECTIONS: Answer all ten questions below. Each question is worth 1 point for a total of 10 for the assignment. Please save your answers in a WORD file with your first and last name (such as MeghanSolomon.doc). Use the “How to submit an assignment” handout to guide you in the process of submitting your completed work online. 1. What is the goal of science? The goal of science is to understand our physical surroundings on how it works. 2. What are
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