Cherylanne mixes together Chemical A and Chemical B in a test tube, forming Chemical C. The mixture instantly turns cool to the touch. She then adds Chemical D, and the reaction becomes hot and explodes.
Answer
A
Chemicals A and B form an endothermic reaction, and chemicals C and D form an exothermic reaction.
B
Chemicals A and B form an exothermic reaction, and chemicals C and D form an endothermic reaction.
C
Chemicals A and C form an endothermic reaction, and chemicals B and D form an exothermic reaction.
D
Chemicals A and B form an exothermic reaction, and chemicals B and D form an endothermic reaction.