Elements and Compounds Introduction

Which of the following statements is true for both elements and compounds?

• They are homogeneous.

• They are the simplest form of matter.

• They are commonly found free in nature.

• They can be broken down into simpler substances.

It is the simplest type of matter and cannot be broken down into components.

• Element

• Compound

• Mixture

• Homogeneous

Which of the following statements is TRUE?

• Ferrous sulfate cannot be broken down into simpler substances.

• Compounds can be broken down by physical means.

• Water is composed of more than two different elements.

• Compounds are more complex than elements.

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Which of the following substances is an element?

• air

• iron

• salt

• sugar

Compounds are formed when two or more ​ ​ (a)   are chemically combined. When these elements are chemically combined a new substance is formed with new chemical and physical properties. An element is a ​ (b)   substance that cannot be separated into simpler substances by physical or chemical means.

• elements

• compounds

• molecules

• atoms

• pure

• physical

• combined

• molecule

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Magnesium (Mg) is ​ (a)   , while Magnesium oxide (MgO) is ​ (b)   .

• an element

• a molecule

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This picture represents a (a)   .

• element

• compound

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Match the following as elements or compounds

• More than one element

• CO2

• Element

• H

• compound

• compound

Match the following vocabulary

• The smallest part of a chemical element

• Compound

• A pure substance represented by a chemical symbol

• Element

• 2 or more atoms held together by a chemical bond

• Molecule

• 2 or more elements combined chemically

• Atom

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Elements have only ​ (a)   capital letter. An example of an element would be ​ (b)   . Compounds have ​ (c)   or more capital letters. An example of a compound would be ​ (d)  

• one

• La

• two

• LiNa

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