Exam: TOEFL

Definition: A chemical compound that contains the nitrite ion, which consists of one nitrogen atom and two oxygen atoms. It is often found in salts or esters derived from nitrous acid.

Example: Nitrite is commonly used in food preservation and as a color fixative in meats.

Definition: A harmful chemical substance that can be a yellow liquid or crystals, often used in making other chemicals and products.

Example: Nitrobenzene is used in the production of dyes and pharmaceuticals.

Definition: A colorless and odorless gas that makes up a large part of the air we breathe and is essential for life, found in many organic compounds and used in various industries.

Example: Nitrogen is a key component in fertilizers that help plants grow.

Definition: A type of enzyme found in certain bacteria that helps convert nitrogen from the air into ammonia, which can be used by plants.

Example: Nitrogenase is essential for the process of nitrogen fixation in many plants.

Definition: Relating to or containing nitrogen, which is a chemical element essential for life and found in many compounds.

Example: Plants need nitrogenous compounds to grow healthy and strong.

Definition: A thick, oily liquid that is highly explosive and used in making dynamite and as a medicine to widen blood vessels.

Example: The construction crew used nitroglycerin to help break through the rock.

Definition: A thick, pale yellow liquid that is a powerful explosive and is also used in medicine to widen blood vessels.

Example: Nitroglycerine is often used in dynamite and can also help treat heart conditions.

Definition: A type of organic compound that contains nitrogen and is known to be harmful, often found in certain foods and products, and can cause cancer in laboratory tests.

Example: Nitrosamines can be formed in some processed meats during cooking.

Definition: Relating to or containing nitrogen, especially in a form that has a lower oxidation state than in similar compounds.

Example: The nitrous oxide used in the experiment helped to enhance the reaction.

Definition: A man-made, radioactive element that is part of the actinide series and has the atomic number 102. It is not found naturally and is produced in very small amounts.

Example: Nobelium is used in scientific research due to its unique properties.