A chemical is any aspect of a substance which is only seen by means of a chemical reaction (反应).
举一反三
- A chemical _______ is any aspect of a substance which is only seen by means of a chemical reaction (反应). A: queries B: property C: obstacles D: margins
- To identify a substance, chemists observe two distinct types of , physical and chemical, which are related to physical and chemical that matters undergoes.
- The change in which a new substance is formed calls a chemical change（）.
- To _____ a substance means to produce it by means of chemical or biological reactions. ( ) A: synthesize B: detach C: affix D: attach
- The energy released by the chemical reaction is ( ) heat.