Reggie and charlotte are baking oatmeal cookies. they dip the baked cookies in melted chocolate. the chocolate cools to form a hardened coating. reggie argues the entire chocolate-covered cookie has undergone a chemical change. charolette disagrees, saying only the original oatmeal cookie has undergone a chemical change, not the chocolate coating.

I'll go with Charlotte.

Before the dip: Naked oatmeal cookies, warm gooshy melted chocolate.

After the dip:  Oatmeal cookies inside a covering, cool solid chocolate.

No new substances appeared during the process.  To me, that means that no chemical change happened.

answer: 802.3 kilo joules of energy represents 191.75 kilo calorie of energy.

explanation:

energy released during combustion of one mole methane = 802.3 kilo joules

if 1 kilo joule = 0.239006   kilo calorie

then ,802.3 kilo joule will be = 802.30.239006 kilo calorie

802.3 kilo joule = 191.75 kilo calorie

hence, the energy in kilo calorie is 191.75 kilo calorie.