An expandable balloon contains 1400 L of helium at 0.950 atm pressure and 18.0 C. At an altitude of 22 miles, the temperature is 2.0 C and the pressure is 255 torr. What will be the volume of the balloon?

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.

the answer is na (sodium)

1 is the answer to this problem

wher is the rest of the question