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

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What does the law of conservation of energy state?

Energy can be created and destroyed

Energy can only be transformed from one form to another

The law of conservation of energy states that energy cannot be created or destroyed; it can only change forms. This means that in any process, the total amount of energy remains constant, though it may transform from one type to another, such as kinetic energy becoming potential energy, or chemical energy being converted into thermal energy. This principle is foundational in science, as it explains that energy is always conserved within a closed system, which supports numerous scientific theories and practical applications.

The idea that energy can only be transformed highlights the interconnectivity of different energy types, making it a crucial component of understanding physical processes, whether they occur in a mechanical system, within biological organisms, or in chemical reactions. This principle is pivotal in fields ranging from physics to engineering and environmental science.

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Energy is lost in every reaction

Energy is always stable

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