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Chem Test One M/E

Physical and Chemical Changes and Properites

QuestionAnswer
Material particular kind of matter that has different properties that are used to characterize it
Physical Property is a characteristic that can be observed from a material without changing its chemical identity
Physical Change is a change in the form of matter but not in its chemical identity. All bonds remain intact. The same molecules are present. Temporary.
Chemical Property is a characteristic of a material that involves, or results in a chemical change. "ability, reactivity, or potential"
Chemical Change involves bond breaking and bond formation to give new products by means of a chemical reaction. Is a change in which one or more kinds of matter are transformed into one or more new kinds of matter. It yields new matter and new molecules. Permanent
Three classifications of matter elements, compounds, and mixtures
Elements are pure substances that cannot be broken down (decomposed) into simpler substances by chemical reactions. Have one kind of atom.
Compounds a pure substance made up of two or more elements in a fixed proportion by weight. Has two or more elements that have been chemically combined.
Law of Constant Composition "Definite Proportions" a pure compound, whatever its source, always contains definite, or constant proportions of the elements by mass
Material any particular kind of matter. Materials are either substances or mixtures of substances
Substance is a material that cannot be separates into different materials by any physical process.
Pure substance is a single chemical with definite physical properites
Mixture is a material that can be seperated by physical processes into two or more substances. It contains two or more pure substances that are not chemically combined
Two types of mixtures Homogeneous and Heterogeneous
Homogeneous mixture is uniform in its properties throughout. Density and other physical properties are the same at every point in this mixture. Ex- a solution
Heterogeneous mixture that consists of physically distant parts with different properties. occurs when components of mixture do not mix well
Seperation of mixtures one of the most important functions of chemists. If material is a mixture then it can manually be sorted into piles
Filtration a physical process in which a particular mixture is seperated into a solid and a liquid
Distillation used to serparate the mixture of liquids by their boiling points.
Created by: abigaildunham