In which of the following examples has a chemical reaction occurred? a .after putting liquid batter into a hot pan, the batter solidifies and begins to turn brown. b .after turning on a blender filled with fruits, the fruit is chopped up and mixed together. c. after taking a tray filled with ice cubes out of the freezer, the cubes begin to melt. d. after adding a spoonful of sugar to a mug of hot coffee, the sugar dissolves completely.

"A" is the answer. The chemical reaction is when the batter becomes brown.

B is mixing C is mass becoming a liquid and D. is dissolving no chemical reaction happened there.

Hope that helps!

You would be correct, boiling water does disinfect contamination.    the property of disinfecting means to kill  germs, bacteria and other pathogens or contamination  that might cause an infection or cause a person to become sickly. a couple methods of disinfecting are using soap, other cleaning supplies or by simply "boiling" the contaminate.  the reason why boiling water disinfects certain attributes is because some cells cannot survive the heat and pressure.