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Compounds Matter

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Compounds
Reading Level

	edHelper's suggested reading level:	grades 5 to 8
	Flesch-Kincaid grade level:	7.7

Vocabulary

challenging words:

compounds, chloride, periodic, atom, hydrogen, photosynthesis, undergo, substance, chlorine, molecule, naturally, gasoline, beginning, sodium, liquid, matter

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Compounds By Cindy Grigg

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¹     All matter is made up of tiny particles called atoms. When two or more atoms join together, they form molecules. When different kinds of atoms join together, they form a type of molecule called a chemical compound.
 
²     Each group of linked atoms is called a molecule. Compounds may be made of many atoms. Compounds often have physical properties that are very different from the properties of the elements they are made of. For instance, oxygen in the air is in the form of a gas. Hydrogen is also a gas. When oxygen atoms join with hydrogen atoms, they form molecules of liquid water. What would happen if the atoms of elements couldn't join together to form molecules? There would be no such thing as water. The world would be very different if compounds didn't exist.
 
³     A compound that you probably see every day is sodium chloride or table salt. It is formed when sodium atoms join with chlorine atoms. Sodium is a gray metal, and chlorine is a yellowish poisonous gas. How can these two different substances form a white solid that we can eat?

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Matter

Matter

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