Is a sample of liquid nitrogen more dense than a sample of nitrogen gas

Which material burns faster? metal aluminum

What methods could you use to solubilize calcium carbonate

Pinene is an unsaturated hydrocarbon found in pine resin. if pinene has m+ = 136 and contains 1 double bond(s) and 2 ring(s); what is its molecular formula? enter the formula in the form ch first, then all other atoms in alphabetical order; do not use subscripts. the formula is case-sensitive