Exam: Cambridge English: B2 First (FCE)

Definition: To cause or accelerate a reaction or process, especially in a chemical context.

Example: The enzyme will catalyse the breakdown of the substrate into simpler molecules.

Definition: A substance that helps a chemical reaction happen faster without being used up in the process, or something that causes a significant change or action to occur.

Example: The scientist added a catalyst to the reaction to speed it up.

Definition: A medical condition where the lens of the eye becomes cloudy, leading to vision problems, or a large waterfall.

Example: The doctor recommended surgery to remove the cataract from her eye.

Definition: To arrange or classify things into different groups based on shared characteristics or qualities.

Example: We need to categorise the books by genre to make them easier to find.

Definition: To place something into a specific group or class based on shared characteristics or qualities.

Example: Teachers often categorize students based on their learning styles.

Definition: A type of electrode that has a negative charge and is used in various electrical devices, such as batteries and electron tubes, where it plays a role in the flow of electricity.

Example: In a battery, the cathode is where the reduction reaction takes place.

Definition: Being careful to avoid potential problems or dangers.

Example: She was cautious when crossing the busy street.

Definition: In a careful and watchful way, avoiding risks or dangers.

Example: She approached the edge of the cliff cautiously, making sure not to slip.

Definition: A hollow space or area inside something, such as in the body or in a tooth.

Example: The dentist found a cavity in my tooth that needed to be filled.

Definition: To take part in enjoyable activities or festivities to mark a special occasion or event.

Example: We celebrate our anniversary every year with a big party.

Definition: To honor or mark a special occasion with festivities or ceremonies.

Example: We celebrate our anniversary every year with a big party.