Convert 108km/hour to 108km/seconds

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

What are the first three quantum numbers for the electrons located in subshell 2s?

Although respiratory organs vary across different organisms, they all contain respiratory surfaces that have a large surface area and are extremely thin. explain why having an extremely thin respiratory surface with a large surface area is advantageous for the process of gas exchange