Achemistry student needs of -ethyltoluene for an experiment. he has available of a w/w solution of -ethyltoluene in benzene. calculate the mass of solution the student should use. if there's not enough solution, press the "no solution" button. be sure your answer has the correct number of significant digits.

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.

it's c. elements are placed in rows based on how may valencies electrons have.

its first and third is your answer i did the qustion the fourth isnt right

the answer is 1 i believe