Abeka Chemistry Test 9 (Nine-weeks Exam) fully solved exam study guide (100% accurate expert solutions)download to pass

chlorine halogen used in the disinfection of drinking water and the synthesis of medicines, crop-protection chemicals, and PVC plastics hydrogen the most abundant element in the universe Brainpower Read More Previous Play Next Rewind 10 seconds Move forward 10 seconds Unmute 0:00 / 0:15 Full screen helium noble gas used as a lifting gas in airships and weather balloons, as an extremely low-temperature coolant, and as a laser medium hydrogen isotopes are commonly called protium, deuterium, and tritium nitrogen extracted from the air and used to make artificial fertilizers and explosives oxygen a gas found in air that is necessary for the survival of human and animals oxygen ozone is an allotrope of this element fluorine halogen used in dental hygiene and in the manufacture of refrigerants phosphorus exists in an unstable white allotrope and a more stable red allotrope; used to make matches and some fertilizers sulfur extracted from metallurgy the science of extracting metals from their ores and preparing them for use electrolytes substances that dissolve in water to produce ions that can conduct an electrical current Le Chatelier's the effects of changes on equilibrium systems is described by _________ principle kinetics the study of reaction rates and pathways is chemical _____? activation energy the minimum kinetic energy that a molecule must possess to undergo a chemical reaction is the _________? catalyst a substance that increases the rate of a chemical reaction without being consumed in the reaction is a _________? sodium alkali metal found in lye, washing soda, baking soda, and table salt aluminum the most abundant metal in the earth's crust; a lightweight metal widely used to make aircraft, spacecraft, and beverage cans iron the second most abundant metal in the earth's crust; a lightweight metal widely used to make aircraft, spacecraft, and beverage cans gold the most malleable and ductile metal known platinum precious metal used in automotive and industrial catalysts silicon most common semimetal; found in computer chips, glass, and sand iron the metal most commonly refined by means of blast furnaces calcium alkaline earth metal that helps compose limestone, slaked lime, and cement copper metal used in electrical wiring and as a component of brass and bronze Which of the following changes would not increase the rate of a chemical reaction? diluting reactant concentrations A solution that contains as much dissolved solute as possible under equilibrium conditions is said to be ______? saturated The theory that when two molecules collide and chemically react they form a short-lived activated complex before breaking apart to form the products is the _______? transition-state Which of the following statements about catalysts is true? a catalyst increase the reaction by lowering the reaction's activation energy The rate of a chemical reaction is usually measured as ______? the change in concentration of a given substance per unit of time In a solution of sodium chloride in water, water is the ______? solvent Which of the following statements best describes a system at equilibrium? Rates of forward and reverse reactions are equal The flow of solvent through a semipermeable membrane from a more dilute solution to a more concentrated solution is called osmosis A mixture of two or more metals, usually melted together, is a ________? alloy A mixture containing tiny clumps or particles that remain suspended within the mixture and will not settle out is ______? colloid If the temperature of a chemical reaction is increased from 20C to 30C, we would ordinarily expect the reaction rate to __________? double