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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Introduction to Physical Geography Homework: Chapter 15 Key Terms and Concepts (1-24) 1. Denudation is the total effect of all actions (weathering‚ mass wasting‚ and erosion) that lower the surface of the continents. 2. Weathering- the physical and chemical disintegration of rock that is exposed to the atmosphere. Mass-wasting- the short-distance down slope movement of weathered rock under the direct influence of gravity; also called mass movement. Erosion- detachment‚ removal‚ and transportation
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Chemical Bonding Chemical compounds are formed by the joining of two or more atoms. A stable compound occurs when the total energy of the combination has lower energy than the separated atoms. The bound state implies a net attractive force between the atoms ... a chemical bond. The two extreme cases of chemical bonds are: Covalent Bonds Covalent chemical bonds involve the sharing of a pair of valence electrons by two atoms‚ in contrast to the transfer of electrons in ionic bonds. Such bonds lead
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Period 9 Chemical Reactions Chemical reactions happen in almost everything around us. Reactions are very important in everyday life‚ and science. Chemical reactions are the changing of substances to other substances by the breaking of bonds in reactants and the formation of new bonds in products. There are different types of chemical reactions such as combination reaction‚ decomposition reaction‚ single-replacement
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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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processes shape the slope landscape in Hong Kong. Chemical weathering involves the decomposition of rock due to the alteration of rock minerals by chemical reactions between the rocks and the water with which they come into contact. Chemical reaction causes certain minerals to change into more vulnerable ones. This weakens the internal structure of the rocks‚ and leads to decomposition. Moisture are particularly crucial to the rate of chemical weathering. High rainfall dissolves rock minerals and weaken
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Chemical Reactions What is a Chemical Reaction? Types of Chemical Reactions Redox Reactions Nonredox Reactions Classifying Reactions What is a Chemical Reaction? A chemical reaction is a process in which the identity of at least one substance changes. A chemical equation represents the total chemical change that occurs in a chemical reaction using symbols and chemical formulas for the substances involved. Reactants are the substances that are changed and products are the substances that are
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their origin‚ evolution‚ form‚ and spatial distribution. Denudation - is any process that wears away or rearranges landforms. Processes include weathering‚ mass movement‚ erosion‚ transportation‚ and deposition. Differential Weathering - the effect of different resistance in rock‚ coupled with variations in the intensity of physical and chemical weathering. Dynamic Equilibrium Model - the balancing act between tectonic uplift and reduction rates of erosion‚ and between the resistance of crust materials
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Chemicals in medicines Rakesh Mohan Hallen The words medicine’ and ’drug’ are often used in our country to mean the same substances: any substance‚ manufactured artificially‚ which can help recovery from sickness‚ relieve symptoms or modify a natural process in the body. A medicine is often a mixture of several chemical compounds. Even if it has only one active component compound often other substances are used as fillers or binders to give it bulk. Chemistry‚ the science related to chemical substances
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Chemical Bonding Lab Chemical compounds are combinations of atoms held together by chemical bonds. These chemical bonds are of two basic types—ionic and covalent. Ionic bonds result when one or more electrons from one atom or group of atoms is transferred to another atom. Positive and negative ions are created through the transfer. In covalent compounds no electrons are transferred; instead electrons are shared by the bonded atoms. The physical properties of a substance‚ such as melting point
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