CompoundsScience Anytime-Harcourt Brace

In this activity you will:

• learn about compounds and how they are formed.

• write a paragraph using the facts that you find.

Compounds

• Compounds are formed when atoms of different elements are combined.

•When the elements are combined their identities change.

Water:

• Water is formed from hydrogen and oxygen.

• Both elements are gases.

• When combined they turn to a liquid.

• Hence their identities change.

Analogy:

• Think of elements as letters of the alphabet and compounds as words formed by combining the letters.

• We can spell all of the English words with just 26 letters.

• We can form millions of compounds with just 109 elements.

• Ex: Sodium(Na) + Chlorine(CI) = Salt(NaCI)

Forming Compounds:

• What type of change occurs when forming compounds?

• Chemical changes• Do the characteristics of an element change when

combined with another?• Yes• What happens when 2 or more elements combine

and their properties change?• A compound is formed

Writing Activity

• Write a paragraph explaining how a compound is formed.

• Include the components combined to form the compound.

• Use the periodic table and give an example of a compound.