A pure substance always has the same physical and chemical properties and is either an element or a compound.。（ ）
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
- To identify a substance, chemists observe two distinct types of , physical and chemical, which are related to physical and chemical that matters undergoes.
- A chemical compound that contains two atoms of oxygen and one atom of another chemical element is called ______
- the quality or state of the chemical substance that has a pH values below 7: