1) Molecules are made of ....................... that are ......................... a) more than one element, chemically combined b) more than one element, combined c) more than one atom, chemically combined d) more than one atom, combined 2) Which is an element that exists as a molecule? a) Ne b) H2O c) O3 d) CH3OH 3) Which are molecules of a compound? a) N2 b) P5 c) NO2 d) HCl 4) Which is a molecule made of two elements only? a) C2H5OH b) C6H12O6 c) H2O2 d) C60 5) What is the chemical formula of sulfur dioxide? a) SO b) S2O c) SO2 d) S2O2

[H] Molecules

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