1) Which of the following is an example of a mixture? a) Sucrose b) Distilled water c) Seawater d) Sodium chloride 2) Which statement(s) below is(are) correct?  a) Y is the melting point b) Through MN, an input of energy increases the energy of the solid c) Through NO, the liquid and solid states coexist 3) What is the maximum number of electrons in energy level n = 4? a) 8 b) 18 c) 32 d) 50 4) Which information does the molecular formula provide? a) A.The simplest ratio of atoms in a molecule b) B. The actual numbers of atoms in a molecule c) C. The number of molecules in one mole d) D. The types of bonds in a molecule 5) Which statement best explains the first ionization energy of sulfur being lower than that of phosphorus? a) A. Sulfur has more protons than phosphorus. b) B. Phosphorus does not have paired electrons in the outer p sub-level. c) C. Sulfur has an unpaired electron in the outer p sub-level. d) D. Phosphorus is more reactive than sulfur. 6) What is the relative atomic mass of an element with the following mass spectrum? a) 77 b) 76.3 c) 76 d) 75.8 7) Which electron transition in the hydrogen atom would produce the shortest wavelength? a) 5p->1s b) 5p->2s c) 5p->3s d) 5p->4s

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