State whether the following statements are true or false. in case a statement is false, write the corrected statement in your notebook.

(a) cutting a log of wood into pieces is a chemical change. (true/false)
(b) formation of manure from leaves is a physical change. (true/ false)
(c) iron pipes coated with zinc do not get rusted easily. (true/false)
(d) iron and rust are the same substances. (true/false)
(e) condensation of steam is not a chemical change. (true/false)

Before they can be published, scientific papers must be peer-reviewed. this means that: a) some other scientific experts read the papers and guarantee that they are true. b) some other scientific experts read the papers and provide quality control by eliminating many mistakes. c) an editor reads the papers, to make sure that all the semicolons are in the correct places. d) everyone in the world is given the opportunity to comment on the papers through a specially maintainedblog. e) government bureaucrats read the papers, to be sure that the papers do not insult the political positions ofthe current officeholders.