1. A chemical substance is widely applied in the process of preparing the cotton for jean production.

Label each of the following as either a physical process or a chemical process:(a)rusting of a metal can is a process;(b)boiling a cup of wateris a process;(c)pulverizing an aspirinis a process;(d)digesting a candy baris a process;(e)exploding of nitroglycerinis a process.

At ____________, photography is a chemical process, during which a light-sensitive material is altered when exposed to light.

In paraffin section preparation, which of the following chemical reagents is used in the process of dehydration? A: Fixatives B: Ethanol C: Xylene D: Paraffin

In the task of analytical chemistry, the process of characterizing the chemical structure of a substance is called ( ) analysis A: Qualitative B: Quantitative C: Structure D: Conformation

The production process of thermal power plant is to convert () of fuel into electric energy. A: chemical energy B: heat energy C: mechanical energy D: kinetic energy

Particulates may also be classified by their origin: . A: Primary—emitted directly from a process B: Secondary—subsequently formed as a result of a chemical reaction C: Smoke and fly ash from forest fires D: Pollens and other aeroallergens

Which glass surface treatment process is used for the glass curtain wall shown in the following picture?[img=825x511]1803a3150fd8b4e.jpg[/img] A: Chemical polishing. B: Glass painting. C: Glass surface coating. D: Glass surface coloring.

chemical

A chemical is any aspect of a substance which is only seen by means of a chemical reaction (反应).