PACT Science 7-12 Latest 2024 Graded A+

PACT Science 7-12 Latest 2024 Graded A+ Ionic Character difference between in electronegativity between two atoms cation positively charged ions anion negatively charged ions Which organic compound smells like fruit? esters - mostly found in fruits Compound substance containing two or more chemical elements held together by chemical bonds What type of reaction is the process of fermentation? exothermic (converting sugar into alcohol) Molar volume of any gas at STP 22.4 L What type of waves do two light sources emit in order to be coherent? - Waves of the same wavelength having constant phase difference. - two waves are coherent if they have the same relative phase Wavelength - determines the nature of light - violet is the shortest and red is the longest - visible light is 400-700 nm Amplitude determines the brightness or intensity of the light Molarity - volume of solution and moles of solute - # of moles of solute dissolved per liter of solution Neutrons quark configuration 2 down 1 up Can sunlight create music? Yes If lowest frequency is positioned in the P.T. against position number, then it observed that frequency is increased directly. What type of increment is this? Simple Function of Ranking number Suffix -ate indicates what about a compound? It contains more oxygen Why do passenger side mirrors have "objects are closer than they appear" printed on them? They are convex mirrors that allow drivers to get a wide-angle view of the road behind them, and to the sides. This causes objects to appear more distant. What basis is the modern P.T. arranged? atomic number As electrons move between shells further from the nucleus, they emit __________ energy. less Endothermic Reaction - heat is absorbed and transferred from its surroundings to the system. - positive H Exothermic Reaction - heat is emitted and transferred from the system to its surroundings. - negative H Line Spectrum - spectrum that is obtained from the light emitted by the substance that is vaporized in a flame or heated by an electric arc - only a specific wavelength is emitted or absorbed - Determined by electrons moving in energy levels Conductivity Range of Semiconductors