Ligações Químicas

Question 1

What type of bond (ligação) involves the sharing of electron pairs between (entre) atoms?

Answer 1

Covalent bond

Question 2

True or False: Ionic bonds are formed between metals and non-metals.

Answer 2

True

Question 3

Fill in the blank (espaço em branco): In metallic bonding, electrons are ________ among (entre) a lattice (rede) of metal cations.

Answer 3

delocalized (deslocados)

Question 4

What is the primary characteristic of ionic compounds (compostos)?

Answer 4

They form crystalline structures and have high melting points.

Question 5

Which bond type is typically associated with high electrical conductivity in the solid state?

Answer 5

Metallic bond

Question 6

Multiple Choice: Which of the following is an example of a covalent compound? A) NaCl B) H2O C) MgO

Answer 6

B) H2O

Question 7

What is formed when a metal reacts with a non-metal?

Answer 7

Ionic bond

Question 8

True or False: Covalent bonds can only form between non-metal atoms.

Answer 8

True

Question 9

What type of bond is characterized by the transfer of electrons?

Answer 9

Ionic bond

Question 10

Fill in the blank: In a covalent bond, atoms share ________ to achieve (alcançar) stability.

Answer 10

electrons

Question 11

Which type of bond typically results in lower melting and boiling points? (fusão e ebulição)

Answer 11

Covalent bond

Question 12

Multiple Choice: Which of the following properties is NOT associated with metallic bonds? A) Malleability B) Ductility C) High ionization energy

Answer 12

C) High ionization energy

Question 13

What is the result of the electrostatic attraction between oppositely charged ions?

Answer 13

Ionic bond

Question 14

True or False: Metallic bonds involve a fixed arrangement of electrons.

Answer 14

False

Question 15

What type of bond is formed when two atoms share one or more pairs of electrons?

Answer 15

Covalent bond

Question 16

What is the octet rule?

Answer 16

The octet rule states that atoms tend to gain, lose, or share electrons in order to have eight electrons in their valence shell.

Question 17

True or False: The octet rule applies only to noble gases.

Answer 17

False: The octet rule applies to many elements, not just noble gases, as they seek to achieve a stable electron configuration.

Question 18

Fill in the blank: Atoms achieve a full valence shell by ______ electrons.

Answer 18

gaining, losing, or sharing

Question 19

Which of the following elements typically follows the octet rule? A) Helium B) Hydrogen C) Lithium D) Neon

Answer 19

D) Neon

Question 20

What is the significance of the octet rule in chemical bonding?

Answer 20

The octet rule helps explain the formation of chemical bonds, as atoms will bond to achieve a full valence shell, leading to stability.