Is combining hydrogen peroxide with manganese dioxide a chemical or physical change?

Why is the vapor pressure of a warm lake higher than the vapor pressure of a cold lake? o a. warm water has a greater heat of vaporization. ob. warm water evaporates more quickly. cool water evaporates more quickly. od. cool water has a greater heat of vaporization.

1. list three scientific reasons cockroaches may fly.

How many grams of oxygen gas are contained in a 15 l sample at 1.02 atm and 28°c? show your work.