As a youngster, you drive a nail in the trunk of a young tree that is 3 meters tall. the nail is about 1.5 meters from the ground. fifteen years later, you return and discover that the tree has grown to a height of 30 meters. about how many meters above the ground is the nail?

If the chemical properties of a substance remain unchanged and appearance or shape of a substance changes it is called a ?

Bahan yang digunakan mencegah terjadinya polarisasi pada batu baterai a.larutan h2so4b.mncl2 dan serbuk karbonc.pbso4d.nh4cl

Awelder using a tank of volume 7.50×10^-2 m^3 fills it with oxygen (with a molar mass of 32.0 g/mol ) at a gauge pressure of 3.30×10^5 pa and temperature of 37.1 ∘c. the tank has a small leak, and in time some of the oxygen leaks out. on a day when the temperature is 23.1 ∘c, the gauge pressure of the oxygen in the tank is 2.00×10^5 pa . a) find the initial mass of oxygen. b) find the mass of oxygen that has leaked out.