Hydrogen sulfide, h, s, is a contaminant in natural gas. it can be removed by the reaction ch4(9)
+ 2h2s(9) = cs2(g) + 4h2(9). heat is required to make the reaction occur. use this reaction to
answer the following questions:
i. what would happen to the equilibrium position if more cs2(g) were added? would this
increase or decrease the amount of h2s?
ii. what would happen to the equilibrium position if the temperature were increased?
iii. what would happen to the equilibrium position if the pressure were increased?

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.

(b) which contains higher levels of vitamin b, oranges or spinach?

explanation:

you can eliminate a, c, and d because they are questions based on opinions.