Chemical
Change /
Chemical Reactions
化
学变化 huà xué biàn huà
/
化学反应 huà xué fǎn
yìng
A chemical change 化学变化 huà
xué biàn huà happens to a substance 物
质 wù zhí when
there is a change in the composition 组
成 zǔ chéng or
make up of the substance. In other words, one or more new
substances are created when there is a chemical change 化学变化 huà
xué biàn huà . The
new substance(s) is(are) chemically different from the substance
before the change. The energy
能
源
néng yuán involved in
a chemical change 化
学变化 huà xué biàn huà
is usually a lot.
Example:
The
burning (or combustion 燃烧 rán shāo) of hydrogen 氢 qīng with oxygen 氧 yǎng
to produce water 水shuǐ
is an example of chemical change 化
学变化 huà xué biàn
huà .
hydrogen
+ oxygen →
water
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