The immensely strong heat creates conviction cells to create movement as it follows the currents.
Can u write it more specifically? so that I can answer
The amount of the solute is constant during dilution. So the mole number of HCl is 2*1.5=3 mole. The volume of HCl stock is 3/12=0.25 L. So using 0.25 L stock solution and dilute to 2.0 L.
Answer:
The half life is 
Explanation:
The half life of a first order reaction is mathematically represented as
Substituting
for the rate constant

A solid is hard and the molecules are packed together, a liquid can move around freely because the molecules aren't as packed together :)