Jem matures in chapter 12.
Calpurnia starts calling Jem "Mister Jem" as he gets older, a sign of respect as he matures into a young adult.
Calpurnia calls Jem "Mr. Jem" in Chapter 12 of "To Kill a Mockingbird." This shows her respect for Jem and her attempt to instill manners and politeness in the children.
Jem touches the Radley's door in Chapter 6 of "To Kill a Mockingbird."
In "To Kill a Mockingbird," Jem and Scout go to church with Calpurnia in Chapter 12. This chapter explores the theme of racial segregation and the different worlds that Jem and Scout experience in their small town of Maycomb.
Bob Ewell scares Scout and Jem on their walk in Chapter 28. He follows them, attacks them, and ultimately injures Jem.
Chapter 16
In Chapter 16, Jem is around 12 years old and Scout is around 9 years old.
scout is in 3rd grade and jem is in 7th grade
Scout tells Jem about the Egyptians using corn cobs for toilet paper in Chapter 1 of "To Kill a Mockingbird."
Jem is entering grade 7. And Sciut is entering grade 3.
Chapter 11
Jem's cot is trembling at the end of Chapter 6 because of an earthquake that occurs during the night. The earthquake shakes the entire house, causing Jem's cot to tremble along with everything else.