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Exam: TOEFL

hydroxide

IPA: /haɪˈdrɒksaɪd/

KK: /haɪˈdrɒksaɪd/

noun

Definition: A type of chemical compound that includes a hydroxyl group, which is made up of one oxygen atom and one hydrogen atom.

Example: Sodium hydroxide is commonly used in cleaning products.

hydroxy

IPA: /haɪˈdrɒk.si/

KK: /haɪˈdrɒk.si/

adjective

Definition: Relating to or containing a hydroxyl group, which is a chemical group made up of one oxygen atom and one hydrogen atom.

Example: The hydroxy compound is used in various chemical reactions.

hydroxyapatite

IPA: //haɪˌdrɒk.siˈæp.ə.taɪt//

KK: /haɪˌdrɒk.siˈæp.ə.taɪt/

noun

Definition: A mineral that is a major component of bone, made of calcium and phosphate, which helps give bones their strength.

Example: Hydroxyapatite is essential for maintaining the structure and strength of bones in vertebrates.

hydroxyl

IPA: /haɪˈdrɒksɪl/

KK: /haɪˈdrɒksɪl/

noun

Definition: A chemical group made up of one oxygen atom and one hydrogen atom, often found in various compounds like acids and alcohols.

Example: The hydroxyl group is essential in the structure of alcohols.

hydroxylapatite

IPA: //haɪˌdrɒksɪlˈæpətaɪt//

KK: /haɪˌdrɒksɪlˈæpətaɪt/

noun

Definition: A mineral form of calcium apatite that contains hydroxyl groups, commonly found in bones and teeth.

Example: Hydroxylapatite is an important component of human bone structure.

hydroxylase

IPA: /haɪˈdrɒksɪleɪz/

KK: /haɪˈdrɒksɪleɪs/

noun

Definition: A type of enzyme that helps add hydroxyl groups to other compounds, facilitating oxidation reactions.

Example: Hydroxylase enzymes play a crucial role in the metabolism of various substances in the body.

hydroxylate

IPA: /haɪˈdrɒksɪleɪt/

KK: /haɪˈdrɒksɪleɪt/

transitive verb

Definition: To add a hydroxyl group to a chemical compound, which can change its properties and reactivity.

Example: Chemists often hydroxylate organic compounds to enhance their solubility in water.

hydroxylated

IPA: /haɪˈdrɒksɪleɪtɪd/

KK: /haɪˈdrɒksɪleɪtɪd/

adjective

Definition: Describing a substance that has undergone a chemical process where a hydroxyl group is added to it.

Example: The hydroxylated compound showed increased solubility in water.

verb

Definition: To add a hydroxyl group (–OH) to a molecule, often in the context of chemical reactions.

Example: The compound was hydroxylated to enhance its solubility in water.

hydroxylation

IPA: /haɪˌdrɒk.sɪˈleɪ.ʃən/

KK: /haɪˌdrɒk.sɪˈleɪ.ʃən/

noun

Definition: The process of adding a hydroxyl group to a molecule, which often involves replacing a hydrogen atom.

Example: Hydroxylation is an important reaction in organic chemistry that modifies the properties of compounds.

hydroxylic

IPA: /haɪˈdrɒksɪlɪk/

KK: /haɪˈdrɒksɪlɪk/

adjective

Definition: Relating to or containing hydroxyl groups, which are chemical groups made up of one oxygen atom and one hydrogen atom.

Example: The hydroxylic compounds are important in many chemical reactions.

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