The boiling point of a pure substance is affected by: O size
O mass
O polarity
O volume

Oil rich countries in the middle east cover about 4% of earths total land area but prossess about 48% of the worlds known oil reserves what is the main reason for high concentration of reserves in this part of the world

Categorize them by metal, nonmetal, in periodic tableductilenon-ductilemalleableoften gain electrons easilygood conductorpoor conductorcan be liquidselements

Select the correct location on the image identify the element that humans need to breathe. 2015 er r ights reserved