AFOQT Physical Science Exam Questions and Answers All Correct

AFOQT Physical Science Exam Questions and Answers All Correct The lowest possible temperature - Answer-Absolut Zero The pressure exerted by the gases in the air. units of measurement are kilopascals, atmospheres, millimeters of mercury, and Torr - Answer-atmospheric Pressure Pressure is 100 kPa, 1atm, 760 mm Hg or 760 Torr - Answer-standard atmospheric pressure the smallest particle of an element a nucleus and its surrounding electrons. - AnswerAtom the mass of an atom measured in atomic mass units (amu). an atomic mass unit is equal to one-twelfth of the atom of carbon-12. atomic mass is now more generally used instead of atomic weight. Example: the atomic mass of chlorine is about 35amu. - Answer-atomic mass also known as proton number, it is the number of electrons or the number of protons in an atom. example: the atomic number of gold is 79. - Answer-atomic number a common term used to mean the average molar mass of an element. this is the mass per mole of atoms. Ex: the atomic weight of chlorine is about 35g/mol - Answer-atomic weight the temperature at which a substance undergoes a phase change from a liquid to a gas. - Answer-boiling point. a temperature scale on which the freezing point of water is at 0 degrees and the normal boiling point at standard atmospheric pressure is 100 degrees. - Answer-celsius scale a change between two of the three states of matter, solid, liquid and gas. example when water evaporates t changes from a liquid to a gaseous state. - Answer-change of state. a chemical consisting of two or more elements chemically bonded together. example: calcium can combine with carbon and oxygen to make calcium carbonate a compound of all three elements. - Answer-compound the formation of a liquid from a gas. this is a change of state, also called a phase change. - Answer-condensation the exchange of heat (heat conduction) by contact with another object, or allowing the flow of electrons (electrical conduction) - Answer-conduction the exchange of heat energy with the surroundings produced by the flow of a fluid due to being heated or cooled. - Answer-convection the way that a radioactive element changes into another element due to loss of was through radiation. Example: uranium 238 decays with the loss of an alpha particle to form thorium 234. - Answer-decay the mass per unit volume - Answer-density