Answers edited by Krishna V.

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• How do you simplify #5(k-6)#?
  
• Which of the first 20 elements in the periodic table are metal and which are non-metals?
  
• What is the number of moles of #O_2# that will react with 10.0g of #H_2# to form water in the equation #2H_2 + O_2 -> 2H_2O#?
  
• Question #f5981
  
• Question #53965
  
• What is the derivative of # int_x^(x^2) t^3 \ dt # wrt #x#?
  
• What part of the chemical formula indicates the number of molecules or atoms involved?