North Dakota A+ Science Grade 8 Practice Questions - North Dakota A+ Summative Science - Grade 8 Exam

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A student measures 25 g of baking soda and adds it to 100 g of vinegar in a sealed bag on a balance. After the reaction stops, the bag and everything in it still mass 125 g. Which principle does this best demonstrate?

Conservation of mass in a closed system Conservation of energy in an open system The law of definite proportions The law of multiple proportions

Correct Answer:

Conservation of mass in a closed system

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