When two or more elements combine and form a compound, a chemical change takes place.

当两种或两种以上的元素结合形成化合物时, 发生化学变化.

《简明英汉词典》

This chemical change can be expressed by an equation.

我们可用反应式表示这种化学变化.

辞典例句

Microorganisms are the agents that bring about the chemical change.

微生物是引起化学变化的作用者.

辞典例句

Heat and light can be given off by this chemical change.

这种化学反应能放出热和光.

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The chemical change absorbing heat is named an end – thermal reaction.

吸收热量的化学反应被称为吸热反应.

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Wherever a chemical change takes place , there is a new substance formed.

每当发生化学反应, 都会产生新物质.

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A chemical change always results in forming at least on new substance.

一种化学变化总是产生至少一种新物质.

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Whenever a chemical change takes place, There is a new substance formed.

每当发生化学变化时, 就有一种新的物质生成.

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A chemical change takes place in paper when it burns.

纸燃烧时就发生了化学变化.

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When rust is formed, a chemical change has taken place.

当锈生成时, 就发生了化学变化.

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New material can be brought about through chemical change.

通过变化可以生成新的物质.

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We saw that a chemical change had taken place.

我们看到已发生了化学变化.

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The chemical change gives off [ out ] heat and light.

这类化学变化发出 热乎 光.

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A chemical change takes place in any substance when it burns.

物质燃烧时产生化学变化.

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The chemical change off heat and light.

这种化学变化发出热和光.

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