The correct answer is B) covalent-network solid.

Here's why:

A) Ionic solids are hard and have high melting points, but they can conduct electricity when melted because the ions are free to move.

B) Covalent-network solids are hard, have high melting points, and do not conduct electricity. This is because they are made up of a network of atoms connected by covalent bonds, which are not free to move and carry a current.

C) Molecular solids are generally soft and have low melting points. They also do not conduct electricity.

D) Metallic solids are hard and have high melting points, but they are good conductors of electricity.

E) As explained above, not all of the options meet all the criteria specified in the question.

So, the answer is B) covalent-network solid.

Question

The correct answer is B) covalent-network solid.

Here's why:

A) Ionic solids are hard and have high melting points, but they can conduct electricity when melted because the ions are free to move.

B) Covalent-network solids are hard, have high melting points, and do not conduct electricity. This is because they are made up of a network of atoms connected by covalent bonds, which are not free to move and carry a current.

C) Molecular solids are generally soft and have low melting points. They also do not conduct electricity.

D) Metallic solids are hard and have high melting points, but they are good conductors of electricity.

E) As explained above, not all of the options meet all the criteria specified in the question.

So, the answer is B) covalent-network solid.

Knowee AI · Accepted Answer

The correct answer is B) covalent-network solid.

Here's why:

A) Ionic solids are hard and have high melting points, but they can conduct electricity when melted because the ions are free to move.

B) Covalent-network solids are hard, have high melting points, and do not conduct electricity. This is because they are made up of a network of atoms connected by covalent bonds, which are not free to move and carry a current.

C) Molecular solids are generally soft and have low melting points. They also do not conduct electricity.

D) Metallic solids are hard and have high melting points, but they are good conductors of electricity.

E) As explained above, not all of the options meet all the criteria specified in the question.

So, the answer is B) covalent-network solid.

Which of the following types of crystalline solids is a hard substance, has a high melting point,and is generally a nonconductor of electricity even in melted form?A) ionic solidB) covalent-network solidC) molecular solidD) metallic solidE) all of the above

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