1. A chemical substance is widely applied in the process of preparing the cotton for jean production.
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举一反三
- In the task of analytical chemistry, the process of characterizing the chemical structure of a substance is called ( ) analysis A: Qualitative B: Quantitative C: Structure D: Conformation
- One of the research area in Green Chemistry is to use renewable feedstocks for chemical production. Which could be used as feedstocks for chemical production in the following resources? A: Kitchen garbage B: Waste cooking oil C: Agricultural wastes D: Microalgae
- A chemical is any aspect of a substance which is only seen by means of a chemical reaction (反应).
- With a chemical r______, a new substance can form.
- The production process of thermal power plant is to convert () of fuel into electric energy. A: chemical energy B: heat energy C: mechanical energy D: kinetic energy
内容
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The change in which a new substance is formed calls a chemical change（）.
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Which of the two cleaning process controls are included by Cleaner Production?() A: control before production B: control after production C: the whole process of production D: the whole process of product cycle
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To identify a substance, chemists observe two distinct types of , physical and chemical, which are related to physical and chemical that matters undergoes.
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the quality or state of the chemical substance that has a pH values below 7:
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Cotton was widely planted in the north while industry and manufacture developed in the south.