Which statement best describes the properties of metals? They are shiny and bend without breaking.
They are dull and are good electrical insulators.
They conduct electricity well and are brittle.
They can be flattened and do not conduct heat well.

gas

explanation:

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answer is: c. the experiment shows that the red substance experienced a chemical change.

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.

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