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chemicals    音标拼音: [k'ɛmɪkəlz]
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英文字典中文字典相关资料:


  • PubChem
    Search and explore chemical information in the world's largest free chemistry database Search chemicals by name, molecular formula, structure, and other identifiers Find chemical and physical properties, biological activities, safety and toxicity information, patents, literature citations and more
  • What Is a Chemical? Definition and Examples - Science Notes and Projects
    In everyday usage, a “chemical” often refers to an undesirable additive or contaminant For example, pesticides in water or artificial colorings in food are “chemicals ” But, chemistry sees chemicals somewhat differently A chemical is a substance with a specific composition
  • Chemical substance - Wikipedia
    A chemical substance is a unique form of matter with constant chemical composition and characteristic properties [1][2] Chemical substances may take the form of a single element or chemical compounds If two or more chemical substances can be combined without reacting, they may form a chemical mixture [3]
  • What Is A Chemical ? | NRC. gov
    The Nuclear Regulatory Commission's Science 101: What is a Chemical? A chemical is any substance that has a defined composition In other words, a chemical is always made up of the same "stuff " Some chemicals occur in nature, such as water Other chemicals are manufactured, such as chlorine (used for bleaching fabrics or in swimming pools)
  • Chemicals, Pesticides and Toxics Topics - US EPA
    Learn how to safely handle chemicals, the effects of certain toxins, which substances are controlled or managed, and safer alternatives
  • Chemistry | Definition, Topics, Types, History, Facts | Britannica
    chemistry, the science that deals with the properties, composition, and structure of substances (defined as elements and compounds), the transformations they undergo, and the energy that is released or absorbed during these processes
  • What Is and Is Not a Chemical? - ThoughtCo
    A chemical is any substance that is made of matter, like solids, liquids, or gases Light, heat, and sound are not chemicals since they are not made of matter Chemicals can be both natural, like oxygen, or artificial, like stainless steel
  • CHEMICAL Definition Meaning - Merriam-Webster
    The meaning of CHEMICAL is of, relating to, used in, or produced by chemistry or the phenomena of chemistry How to use chemical in a sentence
  • CHEMICAL | English meaning - Cambridge Dictionary
    adjective us ˈkem·ɪ·kəl of, involved with, relating to, or made by using chemicals or chemistry: the chemical industry a chemical plant producing plastics and rubber
  • Chemical in Science | Definition, Advantages Disadvantages
    Chemicals are made of one or more element bonded together Some examples of chemicals are water (H20), carbon dioxide, hydrogen gas, salt (sodium chloride) ATP, DNA,and hemoglobin





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