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tion (A Principles of Chemistry I Midterm Lecture Examination(A) 14. A(n) is a pure substance that is composed of only one type of atom. a) ion b) homogencous mixture c) element d) chemical bond e) chemical compound 15. Which two of the following atoms are isotopes? 1 :Ce, in La·'[Ba , 1 [Ba a) w Ce and L b) Ce and Ba Ba e) sBa andBa 16. The reaction of elemental chlorine with potassium iodide yields elemental iodine a potassium chloride. Write a balanced chemical equation for this reaction. a) Cl2(g)+ KI(s) â I(s)+ KC12(s) b) C12(g) 2 KI(s) â 12(s) + 2 KCl(s) c) C12(g) + K12(s) â 12(s) + KC12(s) d) Cl(g) + KI(s) â I(s) + KCl(s) e) C12(g) + 2 Kal(s) â 12(s) + 2 KaCl(s) 17. A pure substance composed of two or more different elements is a) an ion. b) a homogeneous mixture. c) a chemical compound. d) a solid. e) an atom. 18. Which of the following statements is/are correct? 1) All ionic compounds that are soluble in water are electrolytes 2) All ionic compounds dissolve in water. 3) Molecular compounds are never soluble in water. a) I only b) 2 only c) 3 only d) 1 and 2 e) 2 and 3 Page 4 of