Exam: TOEFL

Definition: Relating to or made from diatoms, which are tiny, aquatic organisms with silica-based cell walls.

Example: The diatomaceous earth is often used as a natural pesticide in gardens.

Definition: Referring to a molecule that is composed of two atoms, which can be the same or different elements.

Example: Oxygen exists as a diatomic molecule, meaning each molecule is made up of two oxygen atoms.

Definition: A fine powder made from the remains of tiny aquatic organisms called diatoms, used in various industries for filtering, absorbing, and insulating.

Example: The company uses diatomite as a natural filter in its water purification system.

Definition: A type of volcanic vent that is shaped like a cone and is created when gas-filled magma explodes.

Example: The geologists studied the diatreme to understand the volcanic activity in the area.

Definition: A long and angry speech or piece of writing that criticizes someone or something very strongly.

Example: The politician's diatribe against his opponents was filled with harsh accusations.

Definition: A type of chemical compound that has a five-membered ring made up of three carbon atoms and two nitrogen atoms, which can exist in forms like pyrazole and imidazole.

Example: Researchers are studying the properties of diazole compounds for potential applications in pharmaceuticals.

Definition: A type of chemical compound that contains a specific group of nitrogen atoms attached to an organic molecule, often used in making dyes.

Example: The chemist synthesized a diazonium compound for the dyeing process.

Definition: The process of converting an aromatic primary amine into a diazonium compound, usually using nitrous acid.

Example: The chemist performed diazotization to create the diazonium compound needed for the reaction.

Definition: A chemical compound made of two benzene rings connected to a furan ring, often used in chemical processes and can be toxic, especially in its chlorinated forms.

Example: Dibenzofuran is often studied for its environmental impact due to its toxicity.

Definition: A type of compound that has two carboxyl groups in its molecular structure.

Example: Citric acid is an example of a dicarboxylic acid that is found in citrus fruits.