Question

all

18. Consider the two beakers labeled A and B. Beaker A contains 1 mole of iron atoms, and Beaker B contains 1 mole of lead atoms. Which statement concerning these samples is known with certainty? A) Beakers A and B contain an equal number of atoms. B) Beakers A and B contain equal masses of atoms. C) Beakers A and B contain an equal volume of atoms. D) Beakers A and B contain samples with the same density E) None of the above is known with certainty. A) 1 19. The chemical equation below is unbalanced. What is the coefficient of water when the equation is balanced? Mg(OH)/(s) + HCl(g) → MgCl(s) +H.001) B) 2 C) 3 D) 4 E) No coefficient would be shown. 20. Consider the chemical equation shown below. How many moles of oxygen gasare needed to react with hydrogen to form one mole of water 2H(s) Os(g) → 2H2O(1) A) 0.5 mol B) I mol C3 mol D) 4 mol E) 5 mol 21. Upon mixing a clear colorless BaCl solution with a clear, colorless Na2SO4 solution according to the reaction below, a student observes a white cloodiness form. What is responsible for the cloudiness that is observed? BaCl(aq) + NSO (aq) →BaSO4(s) - NaCl) A) NACI B) Baso C) Bach D) Na SO: E) It is impossible to tell without doing the reaction oneself

Answer 1

8, Beaker Beaker A Contains & mol Iron atom B contains & mol Lead atom. As So I mal autom avogadro no. of atoms. Beaker A & Beaker B contains equal no. of atoms. . Answer ④ U. SAD KOH)4+24 44 934#AMG A/***24_045) The unbalanced equation is Mg(OH)2 + He Made + H₂O " Balanced equation is- 2 Mg(OH)₂ + 4H ce 2 Mg cz +4420 Coefficient of water = 4. . Answer is ②4 20. 9Hg, 9) + Og (g) → 2H2010) : To To form a mol H2o, required of is Imol. form and to required oz is 0.5 mol . : Answer is b o. 5 mol 21. The Reaction is Bach (aq) + Na₂SO4= Basoby Nathy Here Bach is water soluble, Na, sog is water soluble Nace is water soluble BaSO4 is water insoluble and white in cole . Basog is responsible for white cloudinessch the solution. . Answer ® Basoa.