Elements and Compounds Introduction

A substance is anything with specific composition and properties. The chart provided lists some substances and their symbols.How many substances in the table provided are compounds?

• 1

• 2

• 3

• 4

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There are 92 naturally occurring elements. How does this relate the the number of compounds?

• Because it takes at least two elements to make a compound, there are fewer than 46 kinds.

• There are exactly 92 kinds of compounds, one for every kind of element.

• Elements combine in different ways to create many more than 92 compounds.

• The number of compounds constantly increases as we discover new elements.

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While elements and compounds are related, they are different. Unlike compounds, elements can be described as which of the following?

• Are the smallest form of a particle

• Consist of only one type of atom

• Exist only as pure substances

• Are made of at least two types of matter

The rocky surface of Earth, its atmosphere, its oceans, and all living things are made up of which of the following, which is also an example of an element?

• Water

• Carbon dioxide

• Sodium chloride

• Aluminum

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The chart provided lists some substances and their symbols. How many of these substances are an example of an element?

• 1

• 2

• 3

• 4

Alexa is writing a paper comparing elements and compounds found in living and nonliving things. Which of the following could Alexa use to correctly describe the relationship between elements and compounds?

• Two compounds are required to make one element in natural systems.

• There is a finite number of elements that can be used to create a multitude of compounds.

• Compounds combine in different ways to create many variations of elements.

• Every elements can be broken down into an infinite number of compounds.

an atom with atomic number 6 would have how many protons 

• 6

• 12

• 3

• cannot be determined 

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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How many protons does this atom have?

• 2.5

• 6

• 5

• 10.811

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Which of the following represents an element?

• H₂O

• H₂

• NaCl

• CaCO₃

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