Regents Chemistry Exam Explanations June 2022

June 2022 Chemistry Regents #16-20

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Questions	Answer	Links	Explanations
16 Under which conditions of pressure and temperature is a real gas most like an ideal gas? (1) low pressure and low temperature (2) low pressure and high temperature (3) high pressure and low temperature (4) high pressure and high temperature	2		ideal vacation. ideal gas low pressure and high temperature
17 Which sample of argon gas has the same number of atoms as a 100.-milliliter sample of helium gas at 1.0 atm and 300. K? (1) 50. mL at 1.0 atm and 300. K (2) 50. mL at 0.5 atm and 300. K (3) 100. mL at 0.5 atm and 300. K (4) 100. mL at 1.0 atm and 300. K	4		Avogadros hypothesis equal volumes of a gas under the same conditions of temperature and pressure have the same number of molecules He and Ar are monoatomic molecules..1 atom per molecule
18 Which process is a chemical change? (1) condensation of H₂O(g) (2) synthesis of MgO(s) (3) evaporation of C₂H₅OH(l) (4) sublimation of CO₂(s)	2		the other 3 are phase changes

19 Which property is determined by the structure, arrangement, and interactions of the molecules of a substance at a given temperature and pressure? (1) atomic radius (3) formula mass (2) half-life (4) physical state	4		either a solid liquid or gas
20 A collision between reactant particles is most likely to result in a reaction when the particles have proper orientation and proper (1) charge (3) mass (2) energy (4) radius	2		you need enough energy to activate a reaction