Which of the following describes an endothermic reaction? a. wood burns in a campfire. b. the shell of an egg breaks when dropped. c. a balloon stretches as air is blown into it. d. batter becomes a pancake when heated.

The endothermic reaction would be D. Batter becomes a pancake when heated. This is because the batter is absorbing the heat in order to turn into a pancake.

Answer is D. Batter becomes a pancake when heated.

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Mg-26 and mg-24 are pair of isotopes. isotopes are defined as atoms of the same element having same atomic number but different mass number. i hope that was .