WVGSA Grade 5 Science Practice Questions - West Virginia General Summative Assessment Grade 5 Science Exam

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A student burns a wooden stick in a sealed glass chamber containing oxygen: Before burning: Wood (15 g) + Oxygen gas (5 g) = 20 grams total mass. After burning: Ash (2 g) + Carbon dioxide gas & water vapor (18 g) = 20 grams total mass. Which statement best summarizes the law demonstrated by this experiment?

Burning destroys matter because solid wood turns into lightweight ash. Total mass is conserved because the combined mass of reaction products equals the combined mass of starting reactants. Oxygen gas turns into solid wood atoms during combustion. Chemical reactions convert energy directly into new mass.

Correct Answer:

Total mass is conserved because the combined mass of reaction products equals the combined mass of starting reactants.

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