edu323 Liberty University -CSB Educ323 - Science Test 2 correctly answered

CSB Educ323 - Science Test 2matter - correct answer === is everything around you. Atoms and molecules are all composed of ===. === is anything that has mass and takes up space. physical properties - correct answer === can be observed or measured without changing the composition of matter. === are used to observe and describe matter. examples: appearance, texture, color, odor, melting point, boiling point, density, solubility, polarity, and many others. physical change - correct answer a === takes place without any changes in molecular composition. The same element or compound is present before and after the change. The same molecule is present throughout the changes. === are related to physical properties since some measurements require that changes be made. chemical properties - correct answer === of matter describes its "potential" to undergo some chemical change or reaction by virtue of its composition. Metals in general have the === of reacting with an acid. Zinc reacts with hydrochloric acid to produce hydrogen gas. chemical change - correct answer a === results in one or more substances of entirely different composition from the original substances. The elements and/or compounds at the start of the reaction are rearranged into new product compounds or elements. a === alters the composition of the original matter. Different elements or compounds are present at the end of the ===. The atoms in compounds are rearranged to make new and different compounds. combustion - correct answer === is a chemical process in which a substance reacts rapidly with oxygen and gives off heat. soot - correct answer because of the high temperatures, exhaust usually occurs as a gas, but there can be liquid or solid exhaust products as well. ===, for example, is a form of solid exhaust that occurs in some combustion processes.