Unit 2 Review: Elements and Compounds

Carbon is considered an element, while carbon dioxide is considered a compound. This is because carbon dioxide is-

• a gas at room temperature.

• made of two different elements.

• given off by green plants.

• useful to human beings.

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Which of the following is the most abundant element in Earth's crust?

• Calcium

• Iron

• Oxygen

• Potassium

A section of the Periodic Table of Elements is provided. What is the chemical symbol for magnesium?

• 12

• Mg

• Magnesium

• 24.31

Compounds are different than elements because compounds are _______________.

• combination of two or more elements.

• not able to be broken down into parts.

• made from the same type of atom.

• a pure substance, elements are not.

Which of the following elements are most abundant in the plants and animals that make up biosphere?

• Sulfur, oxygen, and hydrogen

• Nitrogen, silicon, and oxygen

• Phosphorus, oxygen, and iron

• Oxygen, carbon, and hydrogen

The smallest particle of any particular type of matter is known by which of the following terms?

• Element

• Chemical

• Atom

• Compound

The oceans are primarily composed of which two elements?

• Carbon and hydrogen

• Calcium and silicon

• Hydrogen and oxygen

• Nitrogen and phosphorus

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All of the following elements are major components of living things on Earth EXCEPT:

• nitrogen

• carbon

• sulfur

• oxygen

Which two elements are the most common in the rocky outer surface that makes up the Earth's Lithosphere?

• Silicon and Oxygen

• Oxygen and Hydrogen

• Nitrogen and Oxygen

• Oxygen and Carbon

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The atmosphere is comprised mostly of oxygen and _____________.

• carbon

• hydrogen

• silicon

• nitrogen