Slide 1 of 25 © Copyright Pearson Prentice Hall > Elements and Compounds Distinguishing Elements and Compounds An element is the __________ _________ of.

Slide 1 of 25

© Copyright Pearson Prentice Hall

>Elements and Compounds Distinguishing Elements and Compounds

An element is the __________ _________

of matter that has a unique set of properties.

A compound is a _____________ that

contains _______ _____ __________

_____________ chemically combined in a

fixed proportion.

2.3

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Slide 2 of 25

Elements and Compounds > Distinguishing Elements and Compounds

Compounds ______ ___ _________

_______ into ________ ____________by

__________ __________, but elements

cannot.

2.3

Slide 3 of 25

© Copyright Pearson Prentice Hall

>Elements and Compounds Distinguishing Elements and Compounds

Breaking Down Compounds

A chemical change is a change that _________

____________ with a different _____________ than

the _____________ matter.

When table sugar is heated, it goes through a

___________ of ______________ _____________.

2.3

Slide 4 of 25

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Elements and Compounds > Distinguishing Elements and Compounds

Properties of Compounds

In general, the __________ of _________ are quite

_____________ from those of their _________

__________.

When the elements sodium and chlorine combine

chemically to form sodium chloride, there is a

change in composition and a change in properties.

2.3

Slide 5 of 25

© Copyright Pearson Prentice Hall

>Elements and Compounds Distinguishing Elements and Compounds

Chlorine is used to ______ _____________

____________ in swimming pools.

2.3

Sodium is stored __________ _________ to

keep it from reacting with oxygen or water vapor in

the air. Sodium vapor produces the light in some

street lamps.

Sodium Chloride (commonly known as table salt)

is used to __________ or preserve __________.

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Slide 6 of 25

Elements and Compounds > Distinguishing Substances and Mixtures

2.3

If the composition of a material is

______________, the material is a

______________. If the composition of a

material ______ ______________, the

material is a ____________.

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Slide 7 of 25

Elements and Compounds > Distinguishing Substances and Mixtures

This flowchart summarizes the process for classifying matter.

2.3

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Slide 8 of 25

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Slide 9 of 25

for Conceptual Problem 2.2

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Slide 10 of 25

Elements and Compounds > Symbols and Formulas

Chemists use chemical symbols to represent elements, and chemical formulas to represent compounds.

These chemical symbols were used in earlier centuries.

2.3

Slide 11 of 25

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>Elements and Compounds Symbols and Formulas

Each element is represented by a one or two-letter chemical symbol.

2.3

Slide 12 of 25

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>Elements and Compounds