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Chapter 15- Classification of Matter I. II. Composition of Matter a. __________________ - either an element or a compound. i. When all the atoms in a substance are alike, the substance in an ________________. ii. A ___________________ is a substance with two or more elements combined in a fixed proportion. b. Two or more substances that can be easily separated by physical means form a _______________. i. _________________________- mixture of different and easily distinguishable materials. ii. _________________________- contains two or more gaseous, liquid, or solid substance blended evenly; also called a _________________. iii. ____________- heterogeneous mixture with larger particles that never settle; colloids scatter light in the _______________________. iv. A heterogeneous mixture containing a liquid in which visible particles settle is called a _________________. Properties of Matter a. _____________________- characteristics of a material which can be observed without changing the identity of the substance in the material; examples include __________________ ______________________________________________________________________________ i. __________________- physical description of a substance ii. __________________- how a substance acts; for example magnetism, viscosity, ductility iii. Physical properties such as size and magnetism can be used to _____________________ mixtures. b. ____________________- change in a substance’s size, shape, or state of matter. i. Substance does not change __________________ when it undergoes a physical change. ii. __________________ is a process for separating a mixture by evaporating a liquid and condensing its vapor. c. _________________________- characteristics of a substance indicating that it can change chemically; for example __________________________________________ d. When one substance changes to another substance, a _________________________ has occurred. i. Some chemical changes are indicated by ___________________ change, smell, or bubble formation. ii. Other chemical changes can be used to _______________ such as metals from their ores. e. __________________ of Earth’s surface involves both physical and chemical changes. i. _______________- big rocks split into smaller ones; streams carry rock particles from on location to another. ii. _______________- Chemical changes can occur in rocks when calcium carbonate in limestone changes to calcium hydrogen carbonate due to acid rain. f. Law of ______________________- mass of all substance present before a chemical change equals the mass of all substances after the change.