Which action will increase the number of collisions without changing the energy of reactant molecules? decreasing the concentration of products

increasing the concentration of reactants

decreasing the pressure of the reactant mixture

increasing the temperature of the reactant mixture

Great amounts of electromagnetic energy from our sun and other bodies in space travel through space. which is a logical conclusion about these electromagnetic waves? their energy must be very their frequency must be very low these waves can travel without a medium they only travel through a vacuum of space

8.98 dm3 of hydrogen gas is collected at 38.8 °c. find the volume the gas will occupy at -39.9 °c if the pressure remains constant.

Δu of , in kj/kg, as it isto k, (a)as a of , (b) at , (c) at .