Question 1

Which of the following best explains why atoms form chemical bonds?

Accepted Answer

To reach a situation of minimum energy and maximum stability.

Question 2

Which element is the most electronegative according to the periodic table?

Accepted Answer

Fluorine

Question 3

What is the correct electron configuration for a neutral copper atom ($$Z = 29$$)?

Accepted Answer

$$[Ar] 4s^1$ 3d$$^{10}$$

Question 4

Which of the following compounds is most likely to have an ionic bond?

Accepted Answer

NaCl

Question 5

What is the difference in electronegativity ($$\Delta E.N.) $$required for a bond to be considered ionic?

Accepted Answer

$$\Delta E.N. \geq 1.7$$

Question 6

Which of the following is an exception to the octet rule?

Accepted Answer

H$$_2$$

Question 7

What is the formal charge on the carbon atom in CO$$_2$$ according to the Lewis structure?

Accepted Answer

$$0$$

Question 8

Which of the following best describes a metallic bond?

Accepted Answer

Electrostatic attraction between cations and a sea of delocalized electrons.

Question 9

Which of the following statements about ionic compounds is FALSE?

Accepted Answer

They have low melting points.

Question 10

Which of the following molecules contains a coordinate (dative) covalent bond?

Accepted Answer

HNO$$_3$$

Question 11

A molecule of HCl is formed by the sharing of electrons between H and Cl. The electronegativities are $$2.1 (H) $$and $$3.0 (Cl). $$What type of bond is present?

Accepted Answer

Covalent polar

Question 12

Which of the following elements is most likely to form a cation?

Accepted Answer

Sodium

Question 13

Which of the following best describes the trend of electronegativity in the periodic table?

Accepted Answer

Decreases down a group and increases across a period.

Question 14

Which of the following is a property of substances with metallic bonding?

Accepted Answer

They conduct electricity in solid state.

Question 15

Which of the following Lewis structures is an example of an expanded octet?

Accepted Answer

SF$$_6$$

Question 16

What is the oxidation number of sulfur in H$$_2SO$_4$$?

Accepted Answer

$$+6$$

Question 17

Which of the following best describes a covalent apolar bond?

Accepted Answer

Electrons are shared equally between atoms of the same or similar electronegativity.

Question 18

Which of the following is a correct statement about the Lewis structure of NO (nitric oxide)?

Accepted Answer

It contains an odd number of electrons.

Question 19

Which of the following elements is a metalloid?

Accepted Answer

Silicon

Question 20

Which of the following best explains why NaCl conducts electricity when dissolved in water but not in solid state?

Accepted Answer

Ions are free to move in solution but fixed in the solid lattice.

Conceptos Básicos de Materia y Estructura Atómica: Propiedades Periódicas, Enlaces y Estructuras de Lewis

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