Plastics are created from a processed natural material which is pulled up from below the ground. Why is this important? SELECT ALL that apply. A) Processing and using the natural material releases contaminants into the environment.
B) The Natural material is refined through a chemical process to produce the plastic that is carved into a figure.
C) The natural resource is a non-renewable resource.
D) The Plastic products are biodegradable and do not pollute the enviroment.

Hot air balloons float in the air because of the difference in density between cold and hot air. in this problem, you will estimate the minimum temperature the gas inside the balloon needs to be, for it to take off. to do this, use the following variables and make these assumptions: the combined weight of the pilot basket together with that of the balloon fabric and other equipment is w. the volume of the hot air inside the balloon when it is inflated is v. the absolute temperature of the hot air at the bottom of the balloon is th (where th> tc). the absolute temperature of the cold air outside the balloon is tc and its density is ďc. the balloon is open at the bottom, so that the pressure inside and outside the balloon is the same. as always, treat air as an ideal gas. use g for the magnitude of the acceleration due to gravity.

Pls! plant cells and animal cells were observed under a microscope. the characteristics of two cells are listed below. cell p: does not capture sunlight cell q: has cytoplasm but no chloroplast which statement about the two cells is correct? cell q also has a cell wall. cell q also has large vacuole. cell p also has a large vacuole. cell p also has a cell membrane.

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