Would you have predicted that ethanol would burn and produce energy? explain

Yes, if you look at the molecular structure of ethanol, or even just evaluate the name you should be able to predict that ethanol will burn, thus producing energy. 
Ethanol has a pretty simple molecular structure. The important part is the Oxygen single bonded to a Hydrogen at the end of the molecule. This O-H bond classifies ethanol as an alcohol. You can also tell that ethanol is an alcohol because both end with the same letters (ol). From everyday experience you will probably know that alcohol is flammable and burns readily. Thus, ethanol will burn and produce energy.

I hope this helps! 

the catch is that the top numbers are atomic masses the bottom numbers are the numbers of protons and electrons in an uncharged atom. they are the number of that atoms as you would find them on the periodic table. further, the numbers on the left are used to determine the missing numbers on the right

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer