what is the definition of a substance
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- Definition: A pure substance is a sample of matter with both definite and constant composition with distinct chemical properties.
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Chemical substance Chemical substances are often called 'pure' to set them apart from mixtures. A common example of a chemical substance is pure water; it always has the same properties and the same ratio of hydrogen to oxygen whether it is isolated from a river or made in a laboratory.
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matter Synonym Study Expand. 1. Matter, material, stuff, substance refer to that of which physical objects are composed (though all these terms are also used abstractly). Matter, as distinct from mind and spirit, is a broad word that applies to anything perceived, or known to be occupying space: solid matter; gaseous matter.
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compound compound. in chemistry, a substance composed of atoms atom[Gr.,=uncuttable (indivisible)], basic unit of matter; more properly, the smallest unit of a chemical element having the properties of that element.
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Chemical substance A chemical substance is a form of matter that has constant chemical composition and characteristic properties. It cannot be separated into components by physical separation methods, i.e., without breaking chemical bonds. Chemical substances can be chemical elements, chemical compounds, ions or alloys.ccording to this definition a chemical substance can either be a pure chemical element or a pure chemical compound. But, there are exceptions to this definition; a pure substance can also be defined as a form of matter that has both definite composition and distinct properties.
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CONTENTS A substance containing only one type of atom or one type of molecule is a pure substance. Most of the matter around us, however, consists of mixtures of pure substances. Air, wood, rocks and dirt are examples of such mixtures. Mixtures can be classified as Homogeneous and Heterogeneous.
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Drugs A simple and workable definition of a drug is any chemical or biologic substance that affects the body and its processes. U.S. law defines a drug as a substance intended for use in the diagnosis, cure, relief, treatment, or prevention of disease or intended to affect the structure or function of the body.
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Substance Substances and events are distinguished from properties by the fact that properties are the kinds of things the instances of which depend for their existence on the particular substance or event by which they are instantiated, whereas substances and events are such as not to depend for their existence on particular instances of properties.
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Chemical substance According to this definition a chemical substance can either be a pure chemical element or a pure chemical compound. But, there are exceptions to this definition; a pure substance can also be defined as a form of matter that has both definite composition and distinct properties. The chemical substance index published by CAS also includes several alloys of uncertain composition.
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Chemical substance A chemical substance is a form of matter that has constant chemical composition and characteristic properties. It cannot be separated into components by physical separation methods, i.e., without breaking chemical bonds. Chemical substances can be chemical elements, chemical compounds, ions or alloys. chemical substance (also called a pure substance) may well be defined as any material with a definite chemical composition in an introductory general chemistry textbook.
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- Video: What is a Substance? Chemistry is the study of matter, which can be classified into two categories: substances and mixtures. In this lesson, we will define the term 'substance' and discuss types of substances and specific examples in more detail.
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Chemical substance A chemical substance is a form of matter that has constant chemical composition and characteristic properties. It cannot be separated into components by physical separation methods, i.e., without breaking chemical bonds.
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Chemical substance According to this definition a chemical substance can either be a pure chemical element or a pure chemical compound. But, there are exceptions to this definition; a pure substance can also be defined as a form of matter that has both definite composition and distinct properties.
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- A pure substance contains only one kind of molecule, and a mixture is a combination of two or more pure substances. Distilled water, aluminum foil and table sugar are each made from only one type of particle. However, salt water is a mixture because it contains salt as well as water.
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- In summary, substances are a form of pure matter that comprises only one type of atom (element) or molecule (compound). Examples of substances include silicon, sugar and water. To unlock this lesson you must be a Study.com Member. Create your account.
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What Are Examples of Pure Substances? A pure substance or chemical substance is a material that has constant composition (is homogeneous) and has consistent properties throughout the sample. Here are examples of pure substances.
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- Top Definition. Chemical. 1. Chemicals are pure substances that make up the universe. They can be benign (harmless) such as trihydrogenoxide or malevolent (harmful) such as dihydrogenoxide. 2. Pertaining to chemistry, the study of chemicals. Your food is full of chemicals that might kill you.
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- chemical noun [C]. › any basic substance which is used in or ​produced by a ​reaction involving ​changes to atoms or molecules: The ​government has ​pledged to ​reduce the ​amount of chemicals used in ​food ​production. Each ​year, ​factories ​release millions of ​tonnes of ​toxic chemicals into the atmosphere.
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Chemical substance A chemical substance may well be defined as any material with a definite chemical composition in an introductory general chemistry textbook. According to this definition a chemical substance can either be a pure chemical element or a pure chemical compound. But, there are exceptions to this definition; a pure substance can also be defined as a form of matter that has both definite composition and distinct properties.
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- Mixture. A mixture is one in which two or more pure substances retain their chemical identity. For example, if you dissolve some sugar into water, the sugar molecules and water molecules remain as sugar and water, it is just that the two are now dispersed in each other.
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- A compound is a pure substance which is formed by chemical combination of two or more elements in a fixed ratio by mass. Compounds are the substances which can be decomposed by chemical methods into their constituent elements.iquids are matter having a fixed volume but no fixed shape – they take the shape of the container. Liquids are very difficult to compress. Liquids are composed of higher energy particles which overcome their mutual forces of attraction and move independently. This is the reason why liquids do not have a fixed shape.
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- Substance. Definition. noun, plural:substances. (1) The physical matter, material or that of which an organ or body consists. (2) (chemistry) A material, matter or that which has definite chemical composition and distinct properties.(3) The most vital or essential part of something. (4) Drugs, as in substance abuse.oun, plural:substances. (1) The physical matter, material or that of which an organ or body consists. (2) (chemistry) A material, matter or that which has definite chemical composition and distinct properties. (3) The most vital or essential part of something. (4) Drugs, as in substance abuse.
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DFJHS Science Substances and Mixtures. Matter can be classified into two broad categories: pure substances and mixtures. A pure substance is a form of matter that has an uniform composition and properties that are constant throughout the sample. Elements and compounds are both example of pure substances.ecall that a solution is a mixture of substances in such a way that the final product has the same composition throughout. Remember the example of vinegar that is 5%, by mass, acetic acid in water. This clear liquid is a solution since light easily passes through it and it never separates.
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Chemical substance A pure chemical compound is a chemical substance that is composed of a particular set of molecules or ions that are chemically bonded. Two or more elements combined into one substance through a chemical reaction, such as water, form a chemical compound.
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Chemical substance A chemical substance may well be defined as any material with a definite chemical composition in an introductory general chemistry textbook. According to this definition a chemical substance can either be a pure chemical element or a pure chemical compound.
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- Here are all the possible meanings and translations of the word substances. Editors Contribution(0.00 / 0 votes)Rate this definition: substances. Plural of substance. The human bone has a substance to it which can be defined like the rest of the human body is is composed of a variety of different substances.