Which of the following is true about petroleum? O It emits harmful radiation.
O It is the most expensive fuel.
O It produces greenhouse gases.
O It provides a clean source of energy.

Which statement accurately describes the relationship between air pressure, air density, or altitude? as altitude increases, pressure increases.as altitude increases, air density increases.air pressure and density are lowest at sea level.denser air exerts more pressure than less dense air.

Which compound contains both ionic and covalent bonds? a) hbr b)cbr4 c)nabr d) naoh

How many mmols of tris-hcl are there in 100 ml of a 100 mm tris-hcl buffer solution at ph 8.1? note that the 100 mm refers to the sum of tris and tris-hcl concentrations?