All matter in the universe can be classified into two general categories --- Pure substances or Mixtures. Each of these categories can be subdivided into Elements/Compounds or Heterogeneous/Homogeneous.

Which statement is true about the part of the electromagnetic spectrum that human eyes can detect? it contains only the colors of the rainbow and television waves. o it is divided into seven ranges of wavelengths. it contains ultraviolet, visible, and infrared light. it is divided into nine ranges of wavelengths.

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

What can be found in the ionosphere