The Essence of Chemistry & Significant Contributors to scientific development | 1 HONORS CHEMISTRY Introduction to Chemistry Notes Make sure you can understand these basic questions and concepts so that you can build on the basics to understand the complex material These are just the basics of what is covered in class lectures. This should not be the only resources you use to study. Who developed the concept of atoms? What are atoms? What is the Law of conservation of mass? What is the law of definite
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Chapter 10: Review Questions 3) Seven features of the active sun are: 1. Sunspots: these regions are darker and cooler than the rest of the suns photosphere; they are caused by magnetic fields that protrude at that area of the visible surface. 2. Plages: These are bright areas in the chromosphere. They are associated with magnetic fields emerging from the sun. 3. Solar Flares: these are ejections of large volumes of gas. They can sometimes head our way causing radio interference
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created when uranium atoms split – called fission. What is the process that occurs during a nuclear chain reaction? Nuclear Chain Reactions. A chain reaction refers to a process in which neutrons released in fission produce an additional fission in at least one further nucleus. This nucleus in turn produces neutrons‚ and the process repeats. What happens in a nuclear power plant? Nuclear power plants use uranium as fuel. When
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in cardiac pacemakers‚ electric watches‚ pocket calculators 2002 Question 19 (5 marks) (a) Describe the conditions under which a nucleus is unstable. (2) Nucleus can be unstable if: Mass number is too large (atomic no. >82 = radioactive) Proton: neutron is too low or too high Has a large amount of energy stored can be a result of radioactive decay (b) The following is a flow diagram showing the sequence of products released during the decay of uranium. (3)
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The Stellar Lives of Stars Stars are giant nuclear reactors. In the center of stars‚ atoms are taken apart by tremendous atomic collisions altering the atomic structure and releasing an enormous amount of energy that makes stars hot and bright. Nuclear fusion is an atomic reaction that fuels stars. In fusion‚ many nuclei combine together to make a larger but different element‚ and the result of this process is the release of a lot of energy. Stars are powered by nuclear fusion in their cores
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The Universe: “Life and Death of a Star” video questions Astronomy Name: Period: 1. There are ________________ stars in our galaxy. 400 billion 2. What are the pillars of creation? A cloud of dust and hydrogen gas‚ a “stellar nursery” for the birth of new stars‚ in the Eagle Nebular‚ 700 light years from Earth 3. Each contracting cloud can produce a few dozen to __________________ of stars. A star like our sun requires a gas cloud __________________ times the size of our solar system. The temperature
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will become either a black dwarf‚ neutron star‚ or black hole. NEBULA -A nebula is a cloud of gas (hydrogen) and dust in space. Nebulae are the birthplaces of stars within the nebula there are varying regions when gravity causes this dust and gas to stick together.
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The Structure of Matter There is a large overlap of the world of static electricity and the everyday world that you experience. Clothes tumble in the dryer and cling together. You walk across the carpeting to exit a room and receive a door knob shock. You pull a wool sweater off at the end of the day and see sparks of electricity. During the dryness of winter‚ you step out of your car and receive a car door shock as you try to close the door. Sparks of electricity are seen as you pull a wool blanket
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Relative Atomic Masses of atoms & molecules Mass number & atomic number Atomic structure (neutrons‚ protons & electrons) Mole concept & conversion Avogadro’s concept Empirical & molecular formulae Isotopes FHSC1114 Physical Chemistry Centre for Foundation Studies‚ UTAR Objectives To define relative atomic masses of atoms & molecules To define & determine mass no. & atomic no. To determine no. of neutrons‚ protons & electrons To understand mole concept & Avogadro’s concept To determine the
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atom. Atoms are a collection of various subatomic particles containing negatively charged electrons‚ positively charged protons and neutral particles called neutrons. Each element has its own unique number of protons‚ neutrons and electrons. Both protons and neutrons have mass‚ whereas the mass of electrons is negligible. Protons and neutrons exist at the centre of the atom in the nucleus. Electrons move around the nucleus‚ and are arranged in shells at increasing distances from the nucleus. These
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