Malleability and density are examples of (c? )

extensive properties because they do not depend on the amount of matter in the sample.

extensive properties because they depend on the amount of matter in the sample.

intensive properties because they do not depend on the amount of matter in the sample.

intensive properties because they depend on the amount of matter in the sample.

intensive properties because they do not depend on the amount of matter in the sample.

Explanation: Extensive properties are those properties which depend on the amount of the substance.

Intensive properties are  those properties which do not depend on the amount of the substance.

Malleability and density are examples of intensive properties, as they do not depend on the amount of the substance.

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.