Indicate true or false in each of the following. a) Pressure is foree per unit a
ID: 1039254 • Letter: I
Question
Indicate true or false in each of the following. a) Pressure is foree per unit area rve b) Boy le's law states that the volume of a given mass of gas is inversely 1. proportional to the pressure at constant temperature e) Charles law: at constant pressure, the volume of a given mass of gas is directly proportional to the absolute temperature d) At Standard Temperature and Pressure (STP), the temperature is 25 C (298 K) and the pressure is 1 atm (760 torr)_ e) The equation for the combined gas law for a fixed amount of gas Avogadro's law states that equal volumes of gases, measured under the same conditions of temperature and pressure, contains equal number of molecules Vi/nI V/n2 The ideal gas law equation is PV = nRT which is equal to 0.0821 Liter atm./mole K g) R is a gas constant 2. Complete the following. h) Heat is flowing in or leaving a system. Heat flows between system and environment from a region of temperature to a region of i) temperature. J) In an reaction heat is absorbed and in an reaction heat is evolved. k) In an exothermic reaction, heat (q) is endothermic reaction, heat (q) is and in an (negative/positive) l) The change in enthalpy for a reaction is the difference between the and enthalpies ofExplanation / Answer
a)Pressure is force per unit area- true
b)Boyle's law states that the pressure of a given mass of an ideal gas is inversely proportional to its volume at a constant temperature. - true
c)Charles law states that the volume of an ideal gas at constant pressure is directly proportional to the absolute temperature. - true
d) At STP conditions Temperature = 298K and pressure 1 atm- false
According to IUPAC, it established as STP conditions are Standard temperature = 0 oC or 273.15 K and standard pressure is 760 torr or 1 atm.
e) the equation of combined gas law is (PV/T)= constant k- true, it is a combination of Boyle's law, Charles' law, and Gay-Lussac's law together, we come up with the combined gas law.
f) Avogadro's law states that that equal volumes of gases at the same temperature and pressure contain equal numbers of molecules- true
g) the ideal gas law equation is PV = nRT -true. R is the gas constant with value 0.0821Lit atm /mol K - true
2.
h) Heat is a form of energy flowing in or leaving a system
i) Heat flows from between the system and environment from a region of higher temperature to region of lower temperature.
j) In an endo thermic reaction heat is absorbed and in exothermic reaction heat is evolved.
k) In an exothermic reaction heat (q) is negitive and in endo thermic reaction heat (q) is positive.
l) The change in enthalpies for a reaction is the difference between the enthalpies of products and reactants. which is denoted by ?H.