*CHEMISTRY* *WILL GIVE BRAINEST*

If a gas is held at constant pressure and is heated, which of the following would occur?
O The gas expands proportionally to the increase in temperature.
O The gas contracts proportionally to the increase in temperature.
O The gas volume is a constant because pressure is constant.
O None of the above.

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.

they it depends on if one believes about radioactivity, they make a geiger counter beep but maybe it was going to beep anyway electronics do wierd things all the time or it was programmed to beep near certain metals.

the answer is c

tell me if wrong