INTRODUCTION TO CHEMICAL BONDS CHEMICAL BOND Definition: A chemical bond is defined as a force that acts between two or more atoms to hold them together as a stable molecule. Main types of bond: 1. Ionic or electrovalent bond‚ 2. Covalent bond‚ 3. Coordinate covalent bond Forth type of bond: Metallic bond: The type of bonding which holds the atoms together in metal crystal. Valence electron: The electrons in the outer most energy level in an atom that takes part in chemical bonding
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Preventing Chemical Accidents Introduction to Process Hazard Analysis First Edition Process Safety Management Training from the NJ Work Environment Council EMBED PBrush This material was produced under grant SH-17813-08-60-F-34 from the Occupational Safety and Health Administration‚ U.S. Department of Labor. It does not necessarily reflect the views or policies of the U.S. Department of Labor‚ nor does mention of trade names‚ commercial products‚ or organizations imply endorsement by the U
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” Cost = $0.50 per gram Name of Element: PromethiumOxidation Number(s): Stable at +3‚ sometimes works with a +2Electron Configuration: [Xe] 4f^5 6s^2Melting Point: 1373 KBoiling Point: 3273 KDensity: 7.23 g/cm^3Color of Element in its Standard Phase: A metallic silverState of Matter at Standard Temperature: SolidPhysical Properties: Member of the Lanthanide Family Heat of Vaporization: 289 kJ/mol Molar Volume: 19.95 cm^3/mole Chemical Properties: Electronegativity:
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changes are used to describe matter. A property is a trait of matter‚ when that sample of matter is in a fixed state. There are two different types of properties: physical properties and chemical properties. A change is something that alters the properties of a substance. There are two types of changes: chemical changes and physical changes. A physical property is a property that can be observed without changing the makeup (or composition) of a substance. Some examples of a physical properties
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Purpose: To Inform Topic: Chemical Warfare Intro 1) Chemical weapons are extremely toxic chemicals which differ from explosive weaponry. Middle ages and renaissance are documented to have used poisonous chemicals on individuals. Chemical warfare is use of chemical agents to kill or incapacitate the enemy. 2) Today I will inform you of different chemical agents. Since World War I‚ several types of agents have been developed into weapons. These chemical weapons include (I) Choking
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just literary elements. The meaning and feelings it leaves upon the reader as he or she sets an image in their mind. As the story is read‚ the feelings and morals that are portrayed behind the reasoning of the writer’s purpose. The theme explains what the story is about and the reasoning of why the story was written. (Clugston‚ R.W. Chapter 7) The literary elements help to tell the story that contributes to a reader’s mind of a portrayed theme. The story I chose has strong symbols and character that
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Elements of culture - Language: set of symbols used to assign and communicate meaning. It allows us to name or identify the things in our world so we can think and communicate about them. - Norms: every society or every civilization has a set of norms‚ which are the rules of behavior; this can include the folkways‚ mores‚ taboos and rituals in a culture. - Values: things to be achieved or the things which are considered of great worth or value in a particular culture. - Beliefs and ideologies:
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The Element: Chlorine General Information We researched the chemical element known as chlorine. Chlorine has an atomic number of 17 and an atomic weight of 35.453. It has a valence number of 3. The element has 3 energy levels. Chlorine exists as a greenish-yellow gas at normal temperatures and pressures. Chlorine is second in reactivity only to fluorine among the halogen elements. Chlorine is a nonmetal. It is estimated that 0.045% of the earth’s crust and 1.9% of sea water are chlorine.
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body? Where can you find each‚ and what does each do? Cardiac – found in the heart Smooth – internal organs and tubes‚ stomach‚ urinary bladder Skeletal – attached to bones 8. What controls the contraction of the different types of muscle? Autonomic innervations or spontaneously 9. Describe the arrangement of muscle fibers to make a muscle. Cell membrane called sarcolemma and cytoplasm called sarcoplasm. Arranged with their long axes in parallel. Each fiber is sheath in connective
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Classifying Chemical Reactions Introduction Pre-lab questions 1. Which reactants used in this experiment are flammable? Discuss the safety precautions that are necessary when working with flammable materials in the lab? 2. Summarize the following description of a chemical reaction in the form of a balanced chemical equation? 3. Common observations of a chemical reaction are described in the introduction section. For each observation‚ name a common or everyday occurrence that must involve a chemical reaction
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