17.3 Mastery

________ have both metallic and nonmetallic properties.

• Metalloids

• Metals

• Nonmetals

• Noble gases

________ are different molecular structures of the same element.

• Allotropes

• Isotopes

• Ions

• Compounds

Define the term semiconductor and give an example of an element that is used to make semiconductors.

• A semiconductor is a material that has a conductivity between conductors and insulators; Silicon is an example.

• A semiconductor is a type of insulator; Copper is an example.

• A semiconductor is a type of conductor; Gold is an example.

• A semiconductor is a material that does not conduct electricity; Wood is an example.

Tags

NGSS.MS-PS2-3

Compare and contrast natural elements and synthetic elements.

• Natural elements are found in nature, while synthetic elements are man-made.

• Natural elements are man-made, while synthetic elements are found in nature.

• Both natural and synthetic elements are found in nature.

• Both natural and synthetic elements are man-made.

Graphite and diamond are made of the element carbon. Why is graphite a lubricant and diamond the hardest gem known?

• Graphite has a layered structure allowing layers to slide over each other, while diamond has a rigid 3D structure.

• Graphite is softer due to impurities, while diamond is pure carbon.

• Graphite is a metal, while diamond is a non-metal.

• Graphite is formed under low pressure, while diamond is formed under high pressure.

Which element is present in all organic compounds?

• carbon

• hydrogen

• oxygen

• nitrogen

Tags

NGSS.HS-LS1-6

Explain the importance of organisms that convert nitrogen from its diatomic form into other compounds.

• They help in the process of photosynthesis.

• They are essential for the nitrogen cycle.

• They produce oxygen for respiration.

• They decompose organic matter.

Tags

NGSS.MS-LS2-3