How do you differentiate between Lewis acids and bases?

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• How can I complete the following equation: #CH_3CH_2NH-CH_3 + HBr ->?#
• Which definition for acids and bases is the right one: Lewis or Brønsted?
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• What definition of acids and bases emphasizes the role of protons?
• How are acids and bases defined by Brønsted theory?
• How did Lewis create his acids and bases model?
• What are the differences between Brønsted–Lowry model and the Lewis model for acids and bases?
• How is #H^+# acting in the reaction #H^++:NH_3 ->[H:NH_3]^+#according to the Lewis definition?
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• Which pair is a Brønsted–Lowry conjugate acid–base pair? #NH_3 ; NH_4^+# or #H_3O^+ ; OH^-#...