Worksheets and No Prep Teaching Resources Reading Comprehension Worksheets Matter

Matter, Elements, Molecules, and Compounds Matter

---

Matter, Elements, Molecules, and Compounds
Reading Level

	edHelper's suggested reading level:	grades 5 to 7
	Flesch-Kincaid grade level:	7.25

Vocabulary

challenging words:

lightest, nucleus, compounds, atom, hydrogen, element, substance, molecule, plasma, microscope, universe, mass, lightweight, naturally, liquid, occur

---

Print Matter, Elements, Molecules, and Compounds

Print Matter, Elements, Molecules, and Compounds  (font options, pick words for additional puzzles, and more)

Quickly Print

Quickly print reading comprehension

Proofreading Activity

Print a proofreading activity

---

Matter, Elements, Molecules, and Compounds By Cindy Grigg

---

¹     What is matter? Matter is the stuff that makes up everything in the universe. Matter has mass and takes up space. Matter is made of atoms. Solids, liquids, gases, and plasma are all matter. When all atoms that make up a substance are the same, then that substance is an element. Elements are made of only one kind of atom. Because of this, elements are called "pure" substances. An atom is the smallest piece of an element that still has the properties of that element. For example, aluminum is a lightweight, shiny metal. If we took a piece of aluminum and cut it into small pieces, it would still be aluminum. It would still be a lightweight, shiny metal. The smallest piece would be called an atom. Atoms are so small they cannot be seen even with a microscope. Atoms consist of a nucleus that has protons and neutrons surrounded by electrons outside the nucleus.
 
²     Atoms of different elements can combine to make new substances. A molecule is formed when two or more atoms join together chemically. If atoms combine that are of two or more different elements, we call that a compound. All compounds are molecules, but not all molecules are compounds. When two hydrogen atoms combine with one oxygen atom, it becomes the compound water. The oxygen we breathe is actually two atoms of oxygen combined, so it is a molecule of oxygen. We use abbreviations for elements. These abbreviations for elements are called chemical symbols. When two or more atoms combine to form a molecule or compound, the abbreviation is known as a chemical formula. The chemical formula for an oxygen molecule is O₂.
 
³     The compound water has a chemical formula of H₂O. This is like the "recipe" for water. It tells us that a water molecule is made of two atoms of hydrogen and one atom of oxygen. Oxygen is a gas that we can't see, hear, smell, taste, or feel. But it's in the air we breathe, and without it, we would die. Hydrogen, also a gas, is the lightest substance on Earth. When two atoms of hydrogen join together with one atom of oxygen, those two gases make a liquid compound we call water. Water, a liquid at room temperature, is a very different substance from the two gases that it is made of. Many different compounds can be made when different atoms combine.

Paragraphs 4 to 5:
For the complete story with questions: click here for printable

---

Weekly Reading Books

Create Weekly Reading Books Prepare for an entire week at once!

---

Feedback on Matter, Elements, Molecules, and Compounds

Leave your feedback on Matter, Elements, Molecules, and Compounds   (use this link if you found an error in the story)

---

Matter

Matter

---

Science

Science

Careers in Science         Caring for Earth         Clouds         Dinosaurs         Earth's Land         Earth         Earthquakes         Electricity         Energy         Erosion         Food Pyramid         Food Webs and Food Chain         Forces and Motion         Fossils         Health and Nutrition         How Things Work         Landforms         Life Science         Light         Magnets         Matter

Moon         Natural Disasters         Photosynthesis         Plant and Animal Cells         Plants         Rocks and Minerals         Science Process Skills         Scientific Notation         Seasons         Simple Machines         Soil         Solar System         Sound         Space and Stars         Sun         Tsunami         Volcanoes         Water Cycle         Water         Weather

Copyright © 2025 edHelper