1. (10 points) Indicate whether each of the following statements is true or fals
ID: 560401 • Letter: 1
Question
1. (10 points) Indicate whether each of the following statements is true or false: A. All ionic compounds are soluble. B. Two molecules can have different molecular formulas but the same empirical formula. C. Acetic acid is an electrolyte. D.A balanced net ionic equation always has zero charge on both sides. E. Two different chemical reactions can have the same net ionic equation Titration can be used to determine the concentration of acid in a sample. Ammonia can act as a base when reacting with an acid. F. G. The percent by mass of iron in a compound can be calculated from the compound's empirical H. formula Molarity is an intensive property of a homogeneous mixture. The actual yield can be determined from the theoretical yield. J.Explanation / Answer
A. False, All ionic compound are not soluble in water some of them dissolve to a small extent such that its almost insoluble.
B. True. Molecules can have same emperical formula but different molecular formula Ex, C2H2 acetylene and C6H6 benze both have same emperical formula CH
C. True, since acetic acid is weak acid, dissociation is very less hence its a weak electrolyte
D. True, balance net ionic equation is nothing but charges are balance on both the sides.
E.false, different chemical reactions cannot have same ionic equation
F. True, by titration with a base having known concentration the acid concentration in a sample can be determined
G.true, Ammonia being a weak base can react with an acid stong or weak
H. True, by using the percent by mass of an element itself the emperical formula of a compound is drawn, hence vice versa can be done
I.true, since molarity is mol/L, moles is extensive property and volume is also extensive property, extensive property /extensive property is an intensive property so the molarity.
J. False, the actual yeild is amount of substance produced during a reaction and which cannot be calculated from theoretical yield ( its calculated yield from a balanced chemical equation)
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