the quality or state of the chemical substance that has a pH values below 7:
acidity
举一反三
- A pure substance always has the same physical and chemical properties and is either an element or a compound.。（ ）
- 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.
- When<br/>the substance is measured by atomic absorption spectrophotometry, the<br/>state of the substance is ( ) A: Solid<br/>state B: Liquid C: Vapor<br/>state D: Supercritical<br/>state
- The change in which a new substance is formed calls a chemical change（）.
内容
- 0
To identify a substance, chemists observe two distinct types of , physical and chemical, which are related to physical and chemical that matters undergoes.
- 1
We<br/>can get a new substance if we _____ a chemical substance with others. A: incorporate B: insert C: obtain D: deprive
- 2
The chemical potential of substance B can be defined as [img=119x47]1803a1a9bb65d2b.png[/img]
- 3
1. A chemical substance is widely applied in the process of preparing the cotton for jean production.
- 4
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