An explanation for the results of Test 2 would be that the student A - VCE - SSCE Biology - Question 6 - 2017 - Paper 1

Using a hydrogen peroxide solution with a higher concentration is likely to increase the reaction rate between hydrogen peroxide and catalase. A higher concentration of substrate (in this case, hydrogen peroxide) increases the frequency of collisions between the enzyme (catalase) and the substrate, leading to a faster reaction. Enzymatic reactions typically follow the principles of enzyme kinetics, particularly the Michaelis-Menten model, which indicates that reaction velocity increases with substrate concentration until a saturation point is reached.