Chemistry Quiz
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MATTER AND ITS INTERACTIONS
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To answer "Does a catalyst change the rate of hydrogen peroxide decomposition?", students add 30.0 mL of 3% H2O2 to two identical flasks kept at 25°C. They add 0.50 g of manganese dioxide (MnO2) to Flask A but add nothing to Flask B. They immediately connect each flask to a gas syringe and record the volume of oxygen gas collected after 2 minutes. Which is the best description of the independent variable?
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