Chemistry
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The document defines matter as anything that has mass and takes up space, and provides examples like fire. Non-matter is defined as things without mass or volume, such as shadows or heat. Pure substances contain only one type of particle, while elements cannot be broken down further and compounds contain two or more elements. Mixtures are substances that contain more than one type of material and can be either homogeneous, where the parts can't be seen, or heterogeneous where they can. Reversible changes can be undone while non-reversible changes like burning cannot.
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Matter is anything that takes up space in the universe. It has general properties like mass and volume, and specific properties like color and density. There are two types of changes in matter: physical changes, which do not change the mass or type of matter, like changes in shape or state; and chemical changes, which produce new substances when two or more react. Pure substances are made of one type of matter, while mixtures contain different types that can sometimes be separated.
Matter
Chemistry is the study of matter and its properties. Matter can exist as elements, compounds or mixtures. Elements are pure substances that cannot be broken down further. Compounds are formed by chemical bonds between different elements. Mixtures maintain their individual chemical properties and can be separated physically. The kinetic molecular theory describes matter at the molecular level in terms of motion and energy. A physical change alters a substance's physical properties without changing its chemical makeup, while a chemical change produces new substances.
0609220958470111.pptx
This document discusses the composition and classification of matter. It defines matter as anything that has mass and occupies space, and notes that matter is made up of tiny particles too small to see. It classifies matter as either pure substances like elements and compounds, or mixtures. Pure substances have a fixed composition and cannot be broken down further, while mixtures are combinations of two or more substances that can be separated. Elements are basic forms of matter that cannot undergo chemical reactions, and are classified as metals, non-metals, and metalloids. Compounds are formed by chemical combinations of elements. The document also discusses physical and chemical changes, alloys, and various methods of separating mixtures.
Unit 4: Matter
1. Matter is anything that has mass and takes up space, and can exist as a solid, liquid, or gas. It can change forms through physical or chemical changes.
2. Physical changes alter the shape or state of matter but do not change its chemical composition. They include changes of state between solids, liquids and gases caused by temperature changes.
3. Chemical changes alter the chemical composition of matter and create new substances. They include combustion, oxidation, and fermentation and are not reversible.
Classificationofmatter notes
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.
elements_compounds_mixtures For Stem Students.ppt
This document discusses how scientists classify matter. It explains that matter can be classified as mixtures, elements, or compounds based on its composition and ability to be separated. Mixtures like heterogeneous mixtures and homogeneous mixtures/solutions contain two or more substances that can be separated physically. Elements are the simplest pure substances that cannot be broken down further. Compounds are also pure substances but are made of two or more elements that can be decomposed chemically into simpler substances.
Classification Of Matter Final Upload
The document discusses the classification of matter and different types of mixtures and pure substances. It defines elements as substances with only one type of atom, and compounds as substances with two or more types of atoms bonded together. Homogeneous mixtures are mixtures with a uniform composition throughout and one phase, while heterogeneous mixtures have two or more phases that can be seen. Examples provided include air as a heterogeneous mixture, salad dressing as a homogeneous mixture, milk as an emulsion (heterogeneous mixture), gold as an element, sugar as a compound, and concrete as a heterogeneous mixture. The document also discusses physical and chemical properties and changes.
Zia Learning Elements compounds mixtures
This document discusses how scientists classify matter. It can be classified as mixtures, elements, or compounds based on its composition and ability to be separated. Mixtures like solutions and colloids contain two or more substances mixed together. Elements are the simplest substances that cannot be broken down further. Compounds contain two or more elements combined chemically. Scientists ask questions about uniformity and separability to determine how to classify a substance.
Physical Changes
A physical change alters an object's physical properties but does not change its chemical composition. Physical changes include changes in size, shape, and state of matter. They can often be reversed, such as cutting and rejoining a piece of paper or melting and resolidifying a solid. Examples of physical changes provided in the document are cutting paper, molding clay, changes of state between solid, liquid and gas, and forming mixtures and solutions.
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