Answer Happy

19. What is the most electronegative element Oy Fr c. F d H 20. When filling out orbital diagrain, which of the following is true? Each electrow is added according to the least annount of energy b. Electrons will fill orbitals paired before they are individually isolated Ench electro is added according to the inost amount of energy d. Electrons occupying the same orbital must bave the same spin с. 21. The dinge above shows the Lewis dot structure for different elements. The electron configuration for the element is 1s 2s 2p Which of the following represents its Lewis dot structure? 3 b. 4 c1 d. 2 22. What is the driving force of all of chemistry To ruin teenager's lives To make all atoms have full outer energy levels Positive charges seeking other positive d To balance the charge of the universe charges 21. How many moles of Co, will be produced when you burn 12.5 moles of CH.? CH +30,- 200, + 2 H20 25 moles of CO. c. 6.25 moles of Co, 50 moles of CO d. 12.5 moles of CO, 24 Balance the following Equation: PCI (aq) + _Narodaq)->_PbCrO4(s) + _NaCl(aq) 2.2.2.4 b. 13.1.6 c. 2.3.2.6 d. 1.1.1.2 - 25. Which of the following compounds would be a reactant in the following equation? NOH + HCI-> NaCl + HO HC c. NaCl bH d. MgOH 26. Sodium (Na) and potassium (K) can be classified as a Noble gases d. Alkali metals b Halogens Transition metals c Alkaline earth metals e 27. In an endothermic reaction, energy flows a into the system out of the system b. into the surroundings d out of the universe c e. None of the above