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9 This picture represents
a) atoms of an element
b) molecules of an element
c) molecules of a compound
3) a mixture

c. heat could easily travel through the molecules in the air and escape/enter the flask. removing the air slows down the heat transfer.  

well in order to answer this question you have to provide more information < 3

if you mean hydrogen and oxygen then water is the product

answer: i have one answer

acids are substances that ionize (break off) in an aqueous solution to produce hydrogen (h+) ions

explanation:

hope this and sorry i could only come up with one answer!