just give answer. Thanks Principles of Chemistry I Midterm Lecture Examination (

Question

just give answer. Thanks

Principles of Chemistry I Midterm Lecture Examination () 14. A(n) is a pure substance that is composed of only one type of atom. a) ion b) homogeneous mixture c) clement d) chemical bond e) chemical compound 198 La , i Ba' Ba Which two of the following atoms are isotopes a) ince and 1 La b) 1ssCe and Ba c) 1 La and Ba 1 5. Ce , d) 1La ands Ba 16. The reaction of elemental chlorine with potassium iodide yields elemental iodine and potassium chloride. Write a balanced chemical equation for this reaction. a) Cl2(g) + KI(s) I(s) + KC12(s) C12(g) + 2 KI(s) 12(s) + 2 KCl(s) c) Ch(g) + KI2(s) I2(s) KCl2(s) d) Cl(g) + KI(s) I(s) + KCl(s) e) C12(g) + 2 Kal(s) 12(s) + 2 K2Cl(s) 17. A pure substance composed of two or more different elements is a) an ion b) a homogeneous mixture c) a chemical compound 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) 1 only b) 2 only c) 3 only d) 1 and 2 e) 2 and 3 Pag

Explanation / Answer

14.element (an element is a pure substance composed of atom that has same atomic number)

15.  56135Ba and  13856Ba ( isotopes are elements with same atomic number but different mass number)

16.KI(s) + Cl(g) ------> KCl(s) + I(s)

17.a chemical compound(a substance formed by combination of two or more elements in fixed proportion)

18.option d (1 and 2 are correct)

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