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Anything that has mass and volume.

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A coefficient is a number placed in front of a chemical formula in an equation. It tells you the amount of a reactant or a product that takes part in a reaction. The coefficient applies to every atom of the formula it is in front of

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A number in a chemical formula that tells the number of atoms in a molecule or the ratio of elements in a compound.

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A representation of a chemical reaction that uses symbols to show the relationship between the reactants and the products. A chemical equation tells you the substances you start with in a reaction and  the substances that are formed at the end.

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A combination of chemical symbols and numbers to represent a substance. For example, CO2 is the formula for carbon dioxide. The formula tells you that the ratio of carbon atoms to oxygen atoms in this compound is 1 to 2. Carbon dioxide is a molecular compound.

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The amount of MATTER (Stuff) in an object.

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The material(s) that make up specific objects.

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A substance produced in a chemical reaction.

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A pure substance that is present before a reaction but not after.

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Mass is neither created nor destroyed in chemical reactions. The mass of any one element at the beginning of a reaction will equal the mass of that element at the end of the reaction.

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When two or more molecules interact and the molecules change, it is called a chemical reaction. This means that the bonds between atoms are broken and new bonds are formed. Because breaking bonds makes energy and it takes energy to make new bonds, energy is either released or absorbed in a chemical reaction.

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When one type of atom combines with another type of atom, it creates a molecule. For example, when you combine hydrogen atoms with oxygen atoms, it makes a whole new type of molecule that you may know: water!

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Each type of atom is known as an element and each element has its own different characteristics and properties.

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Atoms are the building blocks for all types of matter. They are like the letters that make up every language.