15. Gas Law´s Boyle-Charles-GayLussac (ENG)Online version Variables that are involved in the gas laws by Leticia López 1 What is atmosferic preassure? a It is the force exerted on a surface by the air inside a balloon. b It is the force exerted on a surface by the air above it as gravity pulls it to Earth. c It is the force exerted on a surface by the mercury inside a balloon. 2 Which are the factors or variables that affect the pressure of a gas? a Amount of moles and volume b Temperature and amount of moles c Amount of moles, volume and temperature 3 What is the unit of temperature in which a gas should be measured? a Kelvin and Celsius b Celsius and Farenheit c Farenheit and Kelvin d Kelvin e Kelvin, Farenheit and Celsius 4 In Boyle's Law, what is the correlation between the variables? a The volume is inversely proportional to its pressure b The volume is directly proportional to its pressure c The pressure is inversely proportional to its temperature d The volume is directly proportional to the moles e Kelvin, Farenheit and Celsius 5 What is the correlation between the variables of Gay-Lussac's Law? a Pressure is inversely proportional to temperature b Pressure is directly proportional to temperature c Pressure is directly proportional to moles d Volume is inversely proportional to temperature e Kelvin, Farenheit and Celsius 6 In Charles's Law, what are the factors that remain constant? a Pressure and moles b Pressure and volume c Volume and temperature d Temperature and moles e Kelvin, Farenheit and Celsius 7 In the Combined Gas Law, what is the factor that remains constant? a Volume b Pressure c Moles d Temperature e Kelvin, Farenheit and Celsius 8 Which of the following formulas is correct to express the Ideal Gas Law? a P1V1/T1 = P2V2/T2 b P1V1 = P2V2 c PV = nTR d V1/T1 = V2/T2 e P1/T1 = P2/T2 Explanation 1 It is the force exerted on a surface by the air above it as gravity pulls it to Earth. 2 The pressure of a gas changes with the effect of temperature, volume and amount of moles of the gas 3 Gas temperature should always be measured in Kelvin 4 In Boyle's Law, the volume of a gas is inversely proportional to its pressure 5 In Gay-Lussac's law, pressure is directly proportional to temperature 6 In Charles Law, the factors that remain constant are the pressure and the number of moles 7 In the Combined Gas Law, the factor that remains constant is the amount of gas measured in number of moles 8 The Ideal Gas Law is expressed by the formula: PV = nTR
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