Question

25. Which of these elements is chemically similar to Helium? A) Ne В) В E) O D) F C) C 26. Which number precedes H2O when the following equation is properly balanced with the smallest set of whole numbers? H2O NaOH Н2 Na D) 4 E) 5 C) 3 A) B) 2 27. Which number precedes H2O when the following equation is properly balanced with the A&C3+ H2 O- Al(OH)3+ CH smallest set of whole numbers? E) 24 D) 12 A) 3 B) 4 C) 6 28. In a correctly balanced equation, the number of reactant molecules must equal the number of product molecu les. A) True B) False

I need the answers for questions 25-28.

Answer 1

23) 0 Me galls Helirem their ? stable Neon CNC) configuration are noble ( completly filled because of octate). orbital) He = Ne= 152 22 s22p6 a Naon + H₂ 26) 2 Nat 2no - B 2 first we balance hydrogen buth that make anaoni go Reactant sich we o write a Na. side towo make balance u each side sodium of 971 12 no 4 Alcohla + 3 cha Alucz + D) 12 We have to balance balance Aluminium and So we agt write on procent side by Hydrogen and write 12 no writing oxypen bath sidle but first we u al on that make 120 then balance total lyolgen a Chy. 28) B) false It ý not rette reactant u equal be only atom for example ; necessary that to number of of reactent M₂ + 3 no. of maleale of product there should is equal to product. 2N4