The Big Idea Over 2500 years ago Aristotle proposed two laws of physics governing motion. One for ‘Earthly bodies’ (objects on Earth) that states objects naturally go in straight lines and one for ‘Heavenly bodies’ (objects in space) that states objects naturally go in circles. This idea held steady for 2‚000 years‚ until Isaac Newton in a triumph of brilliance declared that there is one law of physics that governs motion and he unified “earthly” bodies and “heavenly” bodies with the The Universal
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LIFE CYCLE OF A STAR Stars are formed in nebulae‚ interstellar clouds of dust and gas (mostly hydrogen). These stellar nurseries are abundant in the arms of spiral galaxies. In these stellar nurseries‚ dense parts of these clouds undergo gravitational collapse and compress to form a rotating gas globule. The globule is cooled by emitting radio waves and infrared radiation. It is compressed by gravitational forces and also by shock waves of pressure from supernova or the hot gas released
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Study Guide – 1) What are the parts of an atom? Where are the subatomic particles found? a) Protons‚ neutrons‚ and electrons b) Protons and neutrons are located in the center of an atom in the nucleus and the electrons are located around the nucleus. 2) How does the Atomic Mass # differ from the Atomic #? The atomic mass number is the sum of the number of protons and neutrons in the nucleus of an element and the atomic number is the number of protons that it has. 3) What is an
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Form A Chemistry 100 Introduction to General Chemistry Fall Semester‚ 2010 Exam One‚ 150 points On this page print your name‚ your lab section number‚ and the name of your TA. Also sign this test booklet. Name________________________________Lab section____________TA___________ Signature________________________________________________________________ The exam consists of 21 problems and one extra credit problem. Partial credit is given only for work that is legible and logically and clearly
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calibrated in weight units? problem 3 If a nucleus captures a stray neutron‚ it must bring the neutron to a stop within the diameter of the nucleus by means of the strong force. That force‚ which "glues" the nucleus together‚ is essentially zero outside the nucleus. Suppose that a stray neutron with an initial speed of 1.4 X 107 m/s is just barely captured by a nucleus with diameter d = 1.0 X 10-14 m. Assuming that the force on the neutron is constant‚ find the magnitude of that force. The neutron’s mass
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Used in water softeners B. Follow-Up Questions: Part I 1. How are isotopes of an element different from one another? How are they the same? (10 points) The isotopes of an element have the same amount of protons‚ but a different amount of neutrons‚ so they vary in size. 2. Are mass number and
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Self-assessment practice tests Test 1 – Material from Chapters 2–4 | 45 minutes 1 The kinetic theory suggests different arrangements for the atoms or molecules in the three states of matter. The diagrams below show how evidence suggests the particles are arranged in the three states of matter. 1 2 3 What are the three states shown? 1 A B C D 2 gas liquid solid liquid 2 liquid gas liquid solid 3 solid solid gas gas The graph shows the heating curve for a metal that is solid at room temperature (25
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information? p+ = 12 n° = 14 e- = 10 A) Mg2+ 8) A) B) C) D) E) B) Si C) Mg D) Ne E) Si4+ Identify the charges of the protons‚ neutrons‚ and electrons. protons 0‚ neutrons +1‚ electrons -1 protons +1‚ neutrons 0‚ electrons -1 protons 0‚ neutrons -1‚ electrons +1 protons -1‚ neutrons 0‚ electrons +1 protons +1‚ neutrons -1‚ electrons 0 9) Determine the velocity of a marble (m = 8.66 g) with a
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is one process that unstable atoms can use to become more stable. He went on to work on radioactivity by manipulation of the speed of neutrons from the radioactive element beryllium(Britannica Paragraph 6). Fermi was awarded the Nobel Prize in Physics for work on artificial radioactivity produced by neutrons and for nuclear reactions to occur by slowing the neutrons(Nobel Prize Paragraph 14). An award was even named after him the Enrico Fermi award recognizes scientists of international stature for
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Organic chemistry is the study of essentially all substances containing carbon. Organic compounds that contain only carbon and hydrogen are called hydrocarbons. The simplest hydrocarbons are the alkanes which contain only single covalent bonds. Methane is the simplest alkane. It is also the major component of natural gas. Methane contains only 1 carbon in the molecular formula and the structural formula. There is ethane which is 2 carbons‚ propane that is 3‚ butane which is 4‚ pentane which is 5
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