Question

1. a chemical reaction that causes the mixture to feel cold is an example of an endothermic reaction because thermal energy is —

options: radiated, absorbed, released, created
(button: clear all)

Explanation:

To solve this, we recall the definition of an endothermic reaction. An endothermic reaction is one where the system (the reaction) absorbs thermal energy from the surroundings. If a reaction makes the mixture feel cold, it means the reaction is taking in heat (thermal energy) from the surroundings (including the mixture itself), so the thermal energy is absorbed. Let's analyze the options:

• "radiated" means energy is emitted as radiation, which doesn't fit the cold - feeling context.
• "absorbed" matches the definition of endothermic (absorbing heat, leading to the surroundings feeling cold).
• "released" is characteristic of an exothermic reaction (releasing heat, making the surroundings feel warm).
• "created" is incorrect because energy cannot be created (Law of Conservation of Energy), it can only be transferred or transformed.

Answer:

B. absorbed (assuming the option with "absorbed" is labeled as B, if the original options had labels like A, B, C, D, we use the correct label. From the options, the one with "absorbed" is the correct choice.)