Introduction to Chemical Reactions Answers

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What must occur in order for a chemical reaction to be specifically classified as endothermic instead of exothermic?

A
Atoms are rearranged.
B
Chemical bonds are formed.
C
Energy is released in the form of heat.
D
Energy is absorbed in the form of heat.
22
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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.

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.
23

When baking soda and vinegar react, the surface bubbles. What does this most likely indicate?

A
a chemical change, because a precipitate is being formed
B
a chemical change, because a gas is being formed
C
a non-chemical change, because a precipitate is being formed
D
a non-chemical change, because a gas is being formed

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