Science2.12.2
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Pure substances have a uniform, fixed composition and consistent properties. Elements contain only one type of atom, while compounds contain two or more elements joined in a fixed ratio. Mixtures have variable compositions and properties that depend on how evenly the parts are distributed. Distillation, filtration, evaporation, and other separation processes can be used to isolate or purify substances based on their physical properties.
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Class 9th- Is matter around us pure (Prashant Kirad).pdfHarshitAgrawal367735
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Chemistry ka exam hai chal na de to raha hai 6na 30 ko milte to hai you send you me now the first work on of life the work things to 2you are can we you send are you the work same model as well as in the past four years decades prior to with the out honey of life the world work on of the day work for on the of life us to have to do take money and god 2bless pg you 2send 2pannu 2bro enakku 2days 22pg Pure substances
Pure substancesDanielDowding
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Pure substances have a fixed, uniform structure and composition throughout. They cannot be separated into other components and have definite physical properties like melting and boiling points. Mixtures contain two or more substances mixed together without a fixed structure or composition. Homogeneous mixtures like salt water are uniform throughout, while heterogeneous mixtures like sand and water are non-uniform with different components settling in separate layers. Aqueous solutions use water as the solvent, while non-aqueous solutions use solvents other than water. The solubility of solids in liquids generally increases with temperature as higher temperatures provide more energy to overcome intermolecular forces.Elements, Compounds & Mixtures-- Spring 2012
Elements, Compounds & Mixtures-- Spring 2012jmori1
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This document provides instructions and assignments for students. It includes:
- A list of materials students will need, including notes, assignment logs, STAR cards, worksheets, and folders.
- Instructions for students to return manilla folders and turn in quizzes.
- A 10 minute time limit for an activity.
- Definitions and examples of elements, compounds, and mixtures.
- Assignments due on completing worksheets and STAR cards.Classificationofmatter notes
Classificationofmatter notesfurmannv
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1. Matter is classified as either pure substances or mixtures. Pure substances are uniform and consist of elements or compounds, while mixtures contain two or more substances mixed together.
2. Elements are the simplest pure substances made of only one type of atom, while compounds are formed by chemical bonds between different atoms in specific ratios.
3. Mixtures can be either homogeneous, with substances mixed uniformly, or heterogeneous, with distinct parts. Homogeneous mixtures include solutions and colloids, while heterogeneous mixtures have visible parts that settle over time like suspensions.Is Matter Around Us Pure
Is Matter Around Us PureAnjaliLamba
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This document discusses different types of matter including elements, compounds, mixtures, and their properties. It defines an element as a pure substance made of only one type of atom, while a compound is made of two or more elements chemically bonded together. A mixture maintains the properties of its components and can be separated by physical means, unlike compounds which require chemical processes to break down. The document also compares the properties of various states of matter and different types of mixtures such as solutions, suspensions, and colloids. Various methods for separating mixtures based on differences in properties of their components are also outlined.Science2.12.2
- 2. Pure Substances Pure Substance: Matter that always has Every sample of a given exactly the same substance has the same composition properties because a substance has a fixed, uniform composition. Examples: Table salt and table sugar
- 3. Elements Element: A An element has a substance that fixed composition cannot be broken because it contains down into simpler only one type of substances. atom. An atom is the smallest particle of an element.
- 4. Compounds Compound: A compound A substance that is always contains made from two or two or more more simpler elements joined substances and in a fixed can be broken proportion. down into those simpler Example: Silicon dioxide
- 5. Mixtures The properties of a mixture are less consistent than the The properties of properties of a substance. a mixture can vary because the composition of Mixtures can be a mixture is not classified by how well fixed. the parts of the mixture are distributed throughout the mixture.
- 6. Heterogeneous Homogenous In a heterogenous mixture, the parts of a In a homogenous mixture are noticeably mixture, the substances different. are so evenly distributed that it is difficult to distinguish one Greek: substance from another. Hetero means different Genus means kind
- 7. Colloid When substances A colloid dissolve and form a contains some homogenous mixture, particles that the mixture that forms is are called a solution intermediate in ions Solutions size between the small A suspension is a particles in a heterogenous mixture solution and the that separates into larger particles layers over time. in a suspension
- 8. Physical Properties - Viscosity The tendency of a liquid to keep from flowing, the resistance to flow, is The viscosity of a liquid viscosity. usually decreases when heated. The greater the viscosity, the slower the liquid moves.
- 9. Distillation A process that Practical use: separates the Providing water for substances in a solution submarines based on their boiling points
- 10. Filtration A process that Practical: separates the materials A strainer based on the size of their particles.
- 11. Evaporation A process used to Property: isolate a solid Solubility dissolved in a liquid.
- 12. Flammability A materials ability to burn in the presence of of oxygen. Sometimes, not a desirable property
- 13. Reactivity how readily a substance combines chemically with other substances. Low reactivity: Nitrogen