3. It's not a pure substance, () it is made of different substances.
举一反三
- The physical properties are those properties of a substance that can be observed with changing the substance into other substances.
- The physical properties are those properties of a substance that can be observed with changing the substance into other substances. A: 正确 B: 错误
- Which of the following substances is not amphoteric substance? A: H2O B: HCO3- C: H2PO4- D: CO32-
- Fats and fixed oils are greasy or waxy substance that ill their pure state are normally tasteless, colorless, and odorless.（） A: or B: substance C: their D: normally
- A pure substance always has the same physical and chemical properties and is either an element or a compound.。（ ）