rates of reaction Flashcards
(12 cards)
What can you investigate to find the effects on the rate of a reaction?
Surface area of a solid, concentration of a solution, temperature, and use of a catalyst.
How does increasing the surface area of a solid affect the rate of reaction?
allows more particles to collide more frequently.
How does increasing the concentration of a solution affect the rate of reaction?
It increases the rate by having more reactant particles in a given volume, leading to more frequent collisions.
How does increasing temperature affect the rate of reaction?
It increases particle speed and energy, leading to more frequent and energetic collisions.
How does increasing gas pressure affect the rate of reaction?
It increases the number of particles in a given volume, increasing the frequency of collisions.
What is the particle collision theory explanation for rate changes?
The rate increases if there are more frequent successful collisions between reacting particles.
What is a catalyst?
A substance that increases the rate of a reaction without being chemically changed at the end.
How does a catalyst work?
It provides an alternative reaction pathway with lower activation energy.
What does a reaction profile diagram show?
It shows the energy of reactants and products, activation energy, and overall enthalpy change (ΔH).
What is the effect of changing the surface area of marble chips in a practical?
Smaller chips (larger surface area) increase the reaction rate with dilute hydrochloric acid.
What is the effect of changing the concentration of hydrochloric acid in a practical?
A higher concentration increases the rate of reaction with marble chips.
What practical investigates the effect of different solids on hydrogen peroxide?
The catalytic decomposition of hydrogen peroxide using different solid catalysts.
