A car travels 2.5 hours in a northerly direction for 300 kilometres. determine the cars speed and velocity

The pressure, volume, and temperature of a mole of an ideal gas are related by the equation pv = 8.31t, where p is measured in kilopascals, v in liters, and t in kelvins. use differentials to find the approximate change in the pressure if the volume increases from 14 l to 14.6 l and the temperature decreases from 375 k to 370 k. (round the answer to two decimal places.)

Phase changes are chemical changes. true or false

Anybody wanna ? (picture included? )