10 free GED practice questions in the real exam format, covering the official content areas, with an explanation for every answer.
GED Practice Test 9Tutor mode
Question 1 of 10
Science
A student mixes baking soda and vinegar, which react to form bubbles. In an open beaker, the total mass drops from 152.4 g to 150.6 g. When the same amounts react inside a sealed plastic bag, the mass stays at 160.2 g before and after. Which explanation best accounts for both results?