easy · Enhanced ACT science
A student investigates how the volume of H₂ gas produced depends on the mass of magnesium (Mg) ribbon added to 50 mL of 1.0 M HCl. The student performs three trials using 0.1 g, 0.2 g, and 0.3 g of Mg, keeping the temperature at 25^circC.
In this experiment, what is the independent variable?
- The mass of the magnesium ribbon added
- The temperature of the reaction environment
- The total volume of hydrogen gas collected
- The concentration of the hydrochloric acid
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