KSA Science Grade 7 Practice Questions - Kentucky Summative Assessment Science - Grade 7 Exam

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According to the law of conservation of mass, what happens to the total mass of reactants during a chemical reaction in a sealed, closed container?

Total mass increases because new atoms are created Total mass remains exactly the same before and after the reaction Total mass decreases because mass is destroyed when heat is released Total mass fluctuates depending on the speed of the chemical reaction

Correct Answer:

Total mass remains exactly the same before and after the reaction

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