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How would you correctly write 2,279,000 in scientific notation?

Which of the following molecules have ionic bonding?  1) Na2O      2) C2H4      3) CaCl2     4) O2       5) NH3

Which of the following statement is/are correct?  Methanol reacting with oxygen is a chemical property. The temperature in which water boils is a chemical property. The temperature in which ethanol melts is a physical property. 

What is the molar mass for Ca(NO3)2? 

What is the molar mass for Ba(NO2)2? 

What is the name of Na2SO3?

How many protons and electrons are in an atom of arsenic (As)?  Protons = [p] Electrons = [e]

Determine if the following statements are true of false.  There are more molecules in 2 moles of hydrogen gas than 2 moles of oxygen gas [1] 7 g of water (H2O) has the same number of molecules as 7 g of hydrogen dioxide (H2O2) [2] There are more oxygen atoms in 1.5 moles of carbon dioxide than in 1.5 moles of carbon monoxide [3] 

Name the following compounds:  BaO [1] NaBr [2] PbBr2 [3]

Name the following compounds:  FeI2 [1] CaS [2] KBr [3]