Which of the following you do not need to pay attention while using a centrifuge?

use the correct correct centrifuge tube
balance the centrifuge tube with the same amount of liquid
secure the centrifuge lid
the radius of the centrifuge
use the correct time and speed

Which statement is true according to the kinetic theory? a. molecules of different gases with the same mass and temperature always have the same average density. b. molecules of different gases with the same mass and temperature always have the same average volume. c. molecules of different gases with the same mass and temperature always have the same pressure. d. molecules of different gases with the same mass and temperature always have the same molecular mass. e. molecules of different gases with the same mass and temperature always have the same average kinetic energy.