2026 IGCSE - Chemical Reactions
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15 Terms
A physical change is…
a change in the state, shape or appearance of a substance where no new chemicals are formed.
A chemical change is…
a process where one or more reactants are converted into a new set of products.
Increasing the concentration of a solution ________ the rate of reaction while decreasing the concentration _________ the rate of reaction.
increases, decreases
Increasing the surface area of a solid ________ the rate of reaction while decreasing surface area ________ decreases the rate of reaction.
increases, decreases
Increasing the temperature _________ the rate of a reaction, while decreasing temperature _________ the rate of a reaction.
increases, decreases
Adding a catalyst _______ the rate of a reaction while removing a catalyst __________ the rate of a reaction.
increases, decreases
A catalyst…
increases the rate of a reaction and is unchanged at the end of a reaction.
Describe practical methods for investigating the rate of a reaction.
Tracking mass loss when gasses escape or capturing the volume of gas produced over time.
For a chemical reaction to occur, reactant particles must…
collide with each other with sufficient energy and the correct orientation.
The rate of reaction is directly proportional to…
the frequency of successful collisions.
In terms of kinetic energy, particles must posses energy…
greater or equal the activation energy to break old bonds and form new ones.
Activation energy is…
the minimum amount of energy needed for a collision to be successful and cause a chemical reaction.
Redox reactions are…
reactions which involve simultaneous oxidations and reduction
Oxidation is…
the loss of electrons
Reduction is…
the gain of electrons