Color, hardness, luster, conductivity, and malleability are all examples of —

A. chemical properties
Incorrect. Chemical properties are characteristics of matter that can only be observed when one substance changes into a difference substance.

B. physical properties
Correct! Physical properties are characteristics of matter that can be seen through direct observation.

C. products
Incorrect. Products are substances formed as a result of a chemical reaction.

D. reactants
Incorrect. Reactants are substances that enter into a chemical reaction.

Unlike metals, many nonmetals are —

A. good conductors of heat and electricity
Incorrect. Nonmetals are not good conductors of heat and electricity.

B. malleable and ductile
Incorrect. Nonmetals are not malleable and ductile.

C. gases at room temperature
Correct! Most nonmetals are gases at room temperature while most metals are solids at room temperature.

D. shiny in luster
Incorrect. Nonmetals are not shiny in luster.

In a comparison of metals to nonmetals, metals tend to have —

A. lower melting points and greater conductivity than nonmetals
Incorrect. Metals do have greater conductivity than nonmetals, but metals tend to have higher melting points than nonmetals.

B. lesser conductivity and lower melting points than nonmetals
Incorrect. Metals tend to have greater conductivity and higher melting points than nonmetals.

C. greater melting points and lower conductivity than nonmetals
Incorrect. Metals do tend to have higher melting points than nonmetals, but they also have greater conductivity than nonmetals.

D. greater conductivity and higher melting points than nonmetals
Correct!

An element that has some physical properties that are like metals and some that are like nonmetals are called —

A. partial elements
Incorrect. Metalloids are elements that have some physical properties that are like metals and some that are like nonmetals.

B. metalloids
Correct! Metalloids are elements that have some physical properties that are like metals and some that are like nonmetals.

C. ions
Incorrect. Metalloids are elements that have some physical properties that are like metals and some that are like nonmetals.

D. noble gases
Incorrect. Metalloids are elements that have some physical properties that are like metals and some that are like nonmetals.

The physical characteristics that makes metalloids so useful in the computer industry are —

A. their varying ability to conduct electricity
Correct! Metalloids are semiconductors and under some conditions can conduct electricity like a metal and under other conditions cannot conduct electricity like a nonmetal.

B. their varying boiling points
Incorrect. This is not why metalloids are useful to the computer industry.

C. their varying malleability
Incorrect. This is not why metalloids are useful to the computer industry.

D. their varying luster
Incorrect. This is not why metalloids are useful to the computer industry.