Ontario Grade 9 Science Class Practice Exam 2025 – Your Complete Guide to Exam Success!

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What characterizes an endothermic reaction?

It releases heat into its surroundings

It absorbs heat from its surroundings

An endothermic reaction is characterized by its ability to absorb heat from its surroundings. This process typically results in a decrease in the temperature of the environment surrounding the reaction, as energy is taken in to fuel the transformation of reactants into products. In essence, the system requires heat to progress, and thus, it is driven by the energy absorbed, leading to a higher internal energy state for the products compared to the reactants.

Understanding this concept helps distinguish between various types of chemical reactions. For instance, exothermic reactions, which release heat, demonstrate a marked contrast by increasing the temperature of their surroundings. The characteristics of endothermic reactions also do not inherently involve maintaining a constant temperature or producing gas as a product, as these can apply to different types of reactions regardless of their thermal nature.

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It occurs at a constant temperature

It produces a gas as a product

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