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Chemical reactions that occur when substances are mixed can be identified by the emergence of substances with different properties; the total mass of substances when a reaction occurs remains the same.
Energy can be “produced,” “used,” or “released” by converting stored energy.
Use models to describe that energy in animals’ food (used for body repair, growth, motion, and to maintain body warmth) was once energy from the sun.
Make observations and measurements to identify materials based on their properties.
Conduct an investigation to determine whether the mixing of two or more substances results in new substances.