Physical Sciences/P2
NSC
LimpopoDoE/November 2023
1.4 When the VOLUME of a given mass of gas is DOUBLED at a constant temperature, the PRESSURE is HALVED. Which ONE of the following statements BEST explains this observations?
A The force of attraction between the gas molecules is halved.
B The kinetic energy of the gas molecules is halved.
C The number of collisions per unit time between the gas molecules and the walls of the container is halved.
D The speed of gas molecules is halved.
1.5 Which statement regarding the Kinetic Molecular Theory of ideal gases is incorrect?
A Gas molecules collide elastically.
B All molecules have the same kinetic energy.
C Gas molecules are in random motion.
D Attractive and repulsive forces can be neglected.
\( 1.6 \quad 11,2 \mathrm{dm}^{3} \) of nitrogen gas at STP contains ...
A \( \quad 0,25 \mathrm{~mol} \) of nitrogen molecules.
B \( \quad 0,5 \mathrm{~mol} \) of nitrogen atoms.
C \( 0,25 \mathrm{~mol} \) of nitrogen atoms.
D \( 0,5 \mathrm{~mol} \) of nitrogen molecules
(2)
. 7 An enthalpy diagram provides information about ...
A the energy released or absorbed during the reaction.
B the oxidation states of the reactants and products.
C the average kinetic energy of the reactants and products.
D the change in solubility of the reacting substances.
(2)
