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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** Atom and Introduction to Nuclear physics ** Introduction Alpha-particle scattering 2.1 Experimental set-up ➢ Alpha particle o is a high-energy helium nucleus with 2 protons and 2 neutrons. o has 2 positive charges. ➢ Gold foil was chosen since it has a high atomic mass. Thin gold foil‚ ~10-6m was bombarded by high-energy alpha particles. ➢ Angular deflections/ scattering of alpha particles were measured by observing
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Telling Geologic Time Putting it in perspective Determining geological ages • Relative age dates – placing rocks and events in their proper sequence of formation • Numerical dates – specifying the actual number of years that have passed since an event occurred (known as absolute age dating) Figure 1-15 (p. 16) Geologic Time Scale. Uniformitarianism The physical‚ biological and chemical principles acting on the Earth in the present also acted on the Earth in the past
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Homework – Chapter #2 and #3 1. What is an atom‚ what is an atom composed of and what are the charges of each Component? 2. What is an element? 3. What is atomic number and atomic mass? 4. What is an isotope and how do isotopes interact with other atoms? 5. What is a radioactive isotope? 6. Draw the shell model for the elements carbon‚ oxygen‚ sodium and chloride? 7. What does inert mean? 8. Define chemical bond‚ molecule‚ compounds‚ and mixture. (Give examples) 9. Write a chemical equation
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2.8.1 Enrichment Instructions: This is an honors level course. Answer all questions fully using complete sentences. If you want full credit‚ please provide plenty of details. 1) What is a medical imaging device? Medical imaging comprises different imaging modalities and processes to image human body for diagnostic and treatment purposes and therefore has an important role in the improvement of public health in all population groups. Furthermore‚ medical imaging is justified also to follow the
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Physics Folio Radioactivity Prepared By : Aniq Danial Bin Saharudin 5 Al – Hasseb Sekolah Menengah Sains Banting Contents No | Contents | Page | 1. | Appreciation | | 2. | Introduction | | 3. | Analysis : - Nucleus Of An Atom - Radioactive Decay - The Uses Of Radioisotopes - Nuclear Energy - The Importance Of Proper Management Radioactive
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Selenium‚ found in group 16 of the periodic table‚ follows a cycle in the environment as it transfers between the biosphere‚ atmosphere and hydrosphere. It is also an essential element for humans and animals. It can cause both deficiencies and toxic effects if not taken in the correct quantities. This essay outlines the general features and behaviour of Se in the primary environment‚ its general abundance and its ability to substitute into minerals. Its Eh and pH also are important factors in determining
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Problem Set - Small Molecules (Campbell Chapters 2 and 3) 1. What are the SPONCH elements and what is common among these elements that make them suitable for life? State the four most frequently occurring of the SPONCH elements. Which of the SPONCH elements is found in each of the large biomolecules (carbohydrates‚ proteins‚ lipids‚ nucleic acids). The SPONCH elements are Sulfur‚ Phosphorus‚ Oxygen‚ Nitrogen‚ Carbon and Hydrogen. These are the five key elements that compose living
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Copper is the 29th element in the periodic table‚ located more specifically at group 11‚ period 4. Because of its chemical and physical attributes‚ it is a transition metal‚ which denotes high boiling and melting points. Both a conductor of heat and electricity‚ Copper is ductile and malleable. Its symbol “Cu” derives from the Latin cuprum. Copper is also valued for its two-for-one practicality: it is a vital nutrient that has antibacterial properties. Aside from what many people generally know about
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nucleus. Within the nucleus‚ there are protons (+) and neutrons (neutral). To find the number of neutrons in an atom‚ you subtract the atomic mass from the atomic number. Atoms of an element can have different amount of neutrons. These are called Isotopes. 19.3 Unstable Nuclei and Radiation Positively charged protons in nuclei tend to repel one another. In order to make the nuclei stable‚ neutrons are present to dilute the forces of repulsion. It acts like a form of “Nuclear glue.” At short ranges
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