What is the concentration in mol dm-3 of 20.0g of NaOH( Mr=40.0)in 500.0cm3

Which object forms when a supergiant runs out of fuel? a red giant a black hole a white dwarf a neutron star

This chart lists four kinds of polymers and their sources. what can be known about all four polymers, despite their differences? they come from living things. they share ionic carbon bonds. they are at least 100 monomers long. they are made of repeating subunits.

How have the greenhouse gasses increased from the year 2000 to 2018