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13 January, 06:39

In the following list, decide whether each item is a physical or a chemical change: a. liquid water freezes into solid ice b. wood burns to ashes c. a window shatters when hit with a rock d. an old car sits in a junkyard and rusts e. a cup of hot chocolate gives off steam

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  1. 13 January, 10:11
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    A property that does not bring any change in chemical composition of a substance are known as physical properties.

    For example, shape, size, mass, volume, density, hardness etc of a substance are all physical properties.

    On the other hand, a property that changes chemical composition of a substance is known as chemical property.

    For example, precipitation, reactivity, toxicity etc are chemical property.

    Therefore, given changes are correctly matched as follows.

    liquid water freezes into solid ice - physical change wood burns to ashes - chemical change a window shatters when hit with a rock - physical change an old car sits in a junkyard and rusts - chemical change a cup of hot chocolate gives off steam - physical change
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