The half-life of a reaction is time needed to consume half the reactant.
举一反三
- Half-life is the time for the concentration of a reactant decreases by half.
- . As a literary movement realism came in the first half of the nineteenth century as a reaction against “the lie” of romanticism and sentimentalism.
- The apple is too big , let’s cut it [u] [/u] . A: in half B: to half C: into half D: at half
- This doll is<br/>about ______high. A: a half meter B: half a meter C: half meters D: half meter
- ---What time do you expect me back, Mum? ---_____half an hour.