1)Which of the following bases is/are not strong bases when dissolved in water?
ID: 812349 • Letter: 1
Question
1)Which of the following bases is/are not strong bases when dissolved in water? (You may select more than one chemical): Sr(OH)2, CaO, NH3, KOH, Ba(OH)2.
2)What is the probably the most important intermolecular interaction between ammonium azide molecules at 25 C? dipole-dipole, dispersive, ion-ion/ion-dipole, none
3)Which of the following atoms has the smallest atomic radius? Na,Cs,Li,K,Rb
4)How many electrons does the Mn2+ ion have ? Enter an integer below without any letters or symbols.
5)Logarithms appear a lot in the acid-base and reaction kinetics sections of General Chemistry so it is useful to review the algebraic properties of logarithms. Which of the following expressions is equivalent to log(XY): log(X+Y), log(X) + log(Y), log(X) - (Y), log(X)/log(Y), none
6)The quadratic equation frequently appears in both the equilibrium and acid-base sections of General Chemistry. Therefore, it is useful to refresh the use of the quadratic before applying it to chemistry questions. Which of the following answers is a viable solution to the following equation 3x2 + 6x + 2 = 0: 2.70,1.68,-2.68,1.71,-0.42
7)What is the pH of a solution with a [H+] concentration of 8.50E-08 M? The error interval is +/- 0.1 pH units.
8)What is the pH of a solution with a [H+] concentration of 3.50E-07 M? The error interval is +/- 0.1 pH units.
9)What is the pH of a solution with a [OH-] concentration of 2.60E-04 M? The error interval is +/- 0.1 pH units.
10)Which of the following chemicals are bases or can behave like bases? You may select more than one compound. KOH, PO4 3-, NH3, F-
Explanation / Answer
1). CaO and NH3 are not strong bases when dissolved in water.
Because the conjugate acid of NH3 is NH4+, which is a strong conjugate acid. Therefore NH3 is a weak base while, CaO reacts with water forming calcium hydroxide which is described as "slightly soluble" in water.
3). Li ahs the smallest atomic radius because in a group while moving down atomic radius increases because atomic number of the elements increase resulting in addition of a new shell to the atom.
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