OSAS Science Grade 8 Practice Questions - Oregon Statewide Assessment System - Science, Grade 8 Exam

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A student records the mass of a steel wool sample before burning it in the air. After burning, the steel wool appears smaller and partially turned to ash. When the student measures the mass of the remaining steel wool and ash, it is slightly greater than the original mass. Which statement best explains this result?

Mass was created during the burning process Oxygen gas from the air combined chemically with the iron in the steel wool, adding to the total mass The scale is inaccurate because burning always destroys mass The ash has negative mass, which mathematically increases the total

Correct Answer:

Oxygen gas from the air combined chemically with the iron in the steel wool, adding to the total mass

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