In which of the following examples has a chemical reaction occurred? Group of answer choices

After putting liquid batter into a hot pan, the batter solidifies and begins to turn brown.

After turning on a blender filled with fruits, the fruit is chopped up and mixed together.

After taking a tray filled with ice cubes out of the freezer, the cubes begin to melt.

After adding a spoonful of sugar to a mug of hot coffee, the sugar dissolves completely.

16. why must the number of electrons lost equal the number of electrons gained in every redox reaction? use 3 – 4 sentences in your own words to address this question. 18. what type of radiation is emitted when chromium-51 decays into manganese-51? show the nuclear equation that leads you to this answer. 19. a radioactive nucleus alpha decays to yield a sodium-24 nucleus in 14.8 hours. what was the identity of the original nucleus? show the nuclear equation that leads you to this answer.