CHEM 1311 Exam 1 Questions With Complete Solutions

chemical property correct answer: the way substances may change/react to become another substance physical property correct answer: can be observed without any change to identification and/or composition matter correct answer: anything that has mass and occupies space reactivity, stability, flammability, toxicity, fermentation correct answer: examples of chemical properties malleability, ductility, conductivity, viscosity, boiling/melting point correct answer: examples of physical properties extensive physical property (ex. mass, length, volume) correct answer: physical property that depends on the amount of matter and examples intensive physical property (ex. color, density, boiling point) correct answer: physical property that does not depend on the amount of matter element correct answer: substance composed of only one kind of atom and cannot be broken down by ordinary chemical means pure substance correct answer: elements and compounds are a type of... compound correct answer: 2+ element chemically combines pure substance correct answer: matter having a uniform and definite composition mixture (ex. soil, solutions) correct answer: combination of 2+ elements that are not chemically combined and examples homogenous mixture correct answer: a mixture in which any given portion is identical in composition to any other portion solutions correct answer: homogenous mixtures are also called heterogenous mixture correct answer: not uniform in composition, composition readily distinguished physical change correct answer: affects only physical properties,only physical appearance is changed, identity is not changed chemical change correct answer: produces new substances with new properties, new identity physical change correct answer: if a substance such as iron is melted, what kind of change is it undergoing? chemical change correct answer: if iron is allowed to rust forming Fe2O3, what kind of change is undergoing? chemical change correct answer: the combination of an element and a compound into another compound physical change correct answer: the separation of a mixture into its pure components physical change correct answer: the mixing of two compounds to form a solution accuracy correct answer: refers to the agreement between a measurement and a standard or true value precision correct answer: the smallest repeatable digit of measurement solid correct answer: have a definite shape and are not appreciable compressible compound correct answer: If matter is uniform throughout, cannot be separated into other substances by physical processes, but can be decomposed into other substances by chemical processes, it is called a hypothesis correct answer: the initial or tentative explanation of an observation is called a law correct answer: a concise verbal statement or mathematical equation that summarizes a broad variety of observations and experiences is called a distillation correct answer: a separation process that depends on differing abilities of substances to form g