Question 11 What is the number of the central nitrogen atoms a. 4 b. 3 c. 6 d. 2

Question

Question 11 What is the number of the central nitrogen atoms a. 4 b. 3 c. 6 d. 2 e. 5 Which one of the following statements regarding a weak acid is NOT correct? a. A weak acid has a very low concentration. b. A weak acid ionizes in water to produce hydronium ions. c. A weak acid neutralizes bases. d. A weak acid ionizes only to a small extent in water. e. Acetic acid is an example. Ion-dipole forces always require a. an ion and a water molecule. b. an anion and a polar molecule. c. a polar and a nonpolar molecule d. a cation and a water molecule e. an ion and a polar molecule A. homogeneous mixture of two or more substances is called ___ a. a solution. b. a mass c. a solvent d. an electrolyte e. a compound.

Explanation / Answer

9)The steric number is used to express how many regions of electron density surround a given atom.

The steric number represents the number of lone pairs present on and the number of atoms bonded to the central atom of a molecule. 3+1=4

10) All statement is correct for weak acids.

11)The ion-dipole force is an intermolecular attraction between an ion and a polar molecule.

An ion - dipole interaction occurs between a fully charged ion and a partially charged dipole.

12) A solution is a homogeneous mixture of two or more substances.

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