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Classify the six underline properties in the following paragraph as chemical or physical:

Fluorine is a pale yellow gas that reacts with most substances. The free element melts at -220 centigrade and boils at -188 centigrade .
Finely divided metals burn in fluorine with a bright flame. Nineteen grams of fluorine will react with 1.0 gram of hydrogen.

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Physical properties:
Fluorine is a pale yellow gas,
It melts at -220 centigrade,
It boils at -188 centigrade.

Chemical properties:
It reacts with most substances,
Finely divided metals burn in fluorine with a bright flame,
Nineteen grams of fluorine will react with 1.0 gram of hydrogen.

Physical v/s Chemical Properties:

  • A physical property is a characteristic of a substance that can be observed or measured without changing the identity of the substance.
  • A chemical property describes the ability of a substance to undergo a specific chemical change.

In the given paragraph the properties are defined as such:

→ Physical properties:

  1. Fluorine is a pale yellow gas,
  2. It melts at -220 centigrade,
  3. It boils at -188 centigrade.

→ Chemical properties:

  1. It reacts with most substances,
  2. Finely divided metals burn in fluorine with a bright flame,
  3. Nineteen grams of fluorine will react with 1.0 gram of hydrogen.

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