Definition of chemical reaction in US English:

chemical reaction


  • A process that involves rearrangement of the molecular or ionic structure of a substance, as opposed to a change in physical form or a nuclear reaction.

    • ‘It was undergoing a chemical reaction and increasing the carbon dioxide.’
    • ‘The arrow in a chemical equation represents the process of the chemical reaction.’
    • ‘The heat triggers a chemical reaction that turns the polymers into a hard, incredibly sturdy structure.’
    • ‘They are catalysts that either begin chemical reactions or speed up chemical reactions already in progress.’
    • ‘Energy is not only involved in chemical reactions and technology, but also in our basic bodily functions.’
    • ‘The state of matter may affect the way in which the molecule takes part in a chemical reaction.’
    • ‘Temperature can determine which ions can form or remain stable enough to enter into chemical reactions.’
    • ‘Liquid ammonia is also utilized as a solvent in certain chemical reactions.’
    • ‘But what happens to a chemical reaction if the reagents are not in an ideal ratio?’
    • ‘They each have different chemical reactions because of their molecular structure.’
    • ‘Atoms of these elements have six valence electrons and tend to gain or acquire electrons in chemical reactions.’
    • ‘Most possess only the vaguest understanding of molecules, chemical reactions, and research methods.’
    • ‘A burning cigarette is a complex system in which many types of chemical reactions and physical processes occur in parallel.’
    • ‘His was the first group to study chemical reactions in this way under molecular beam conditions.’
    • ‘The fuel cell generates electricity as a by-product of a chemical reaction involving dilute methanol.’
    • ‘An exothermic reaction is a chemical reaction which produces heat.’
    • ‘This is what scientists call a physical process, because no chemical reactions take place.’
    • ‘Soaps are created by the chemical reaction of a fatty acid with an alkali metal hydroxide.’
    • ‘The energy involved in a chemical reaction can be related to the differences in energy between the reactants and products.’
    • ‘Enthalpy is more useful to chemists than energy when measuring the heat involved in chemical reactions.’