Two identical effervescent tablets are added to equal volumes of water. The water is at 15 ∘C15\ ^\circ\text{C}15 ∘C in one test and 35 ∘C35\ ^\circ\text{C}35 ∘C in the other test. All other conditions are kept the same. Which statement correctly compares the collisions in the two tests?
A larger proportion is successful at 35 ∘C35\ ^\circ\text{C}35 ∘C because more particles have at least the activation energy
The same proportion is successful at both temperatures because only the collision frequency increases
The same proportion is successful at both temperatures because equal volumes of water are used
A larger proportion is successful at 35 ∘C35\ ^\circ\text{C}35 ∘C because warmer water contains more reactant particles
127 exam-style questions on AQA GCSE Chemistry 6.1 Rate of reaction, covering 6.1.1a Calculating rates of reactions, 6.1.1b Gradient of a tangent as rate, 6.1.2 Factors which affect the rates of chemical reactions, 6.1.3 Collision theory and activation energy, and 6.1.4 Catalysts. Each one has a worked solution and a mark scheme showing where the marks go.