A chemical reaction in which energy is released or removed is______________

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Multiple Choice

A chemical reaction in which energy is released or removed is______________

Explanation:
When a reaction releases energy to the surroundings, it is exothermic. The defining feature is energy leaving the system as heat (and sometimes light), which is why this option best fits the description of a reaction where energy is released or removed from the system. Endothermic reactions do the opposite and absorb energy from the surroundings. Isothermal describes keeping the temperature constant, which isn’t about the direction of energy flow. Photochemical refers to reactions driven by light energy, not the general energy change direction. A common exothermic example is combustion, where heat is released to the surroundings.

When a reaction releases energy to the surroundings, it is exothermic. The defining feature is energy leaving the system as heat (and sometimes light), which is why this option best fits the description of a reaction where energy is released or removed from the system. Endothermic reactions do the opposite and absorb energy from the surroundings. Isothermal describes keeping the temperature constant, which isn’t about the direction of energy flow. Photochemical refers to reactions driven by light energy, not the general energy change direction. A common exothermic example is combustion, where heat is released to the surroundings.

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