Physical or chemical property?

smell of vinegar
explosiveness of a firework
reactivity of iron with oxygen
the color of iron wire
the luster of platinum jewelry
the melting point of sugar
the flammability of acetone

What is the partial pressure of ethane, pethane, in the flask?

Which is a difference between molecular compounds and ionic compounds? select the correct answer below: question 5 options: molecular compounds typically form between a metal and a nonmetal, while ionic compounds typically form between nonmetals. molecular compounds result from the transfer of electrons between atoms to form ions, while ionic compounds result from the sharing of electrons between neutral atoms. molecular compounds are formed of discrete, neutral molecules, while ionic compounds are formed of large repeating arrays of opposite charges. molecular compounds have high melting points and high boiling points, while ionic

What is the number of moles of chemical units represented by 9.03x10^24? and how do i show work? (dumb it down )