These worksheets explore the nature of elements, compounds, and mixtures.

Atoms are the simplest form of matter. Atoms have a dense center called the nucleus. In this nucleus you will find two types of sub-atomic particles: positively charged protons and non-charged neutrons. These particle account for the weight (mass) of the atom. Flying around the nucleus, like planets orbiting the sun, are negatively charged sub-atomic particles called electrons. An element is an atom that composed completely of one type of atom. Each element of atom differs by the number of protons it contains. When two or more elements bond together it changes each element’s chemical properties this called a compound. When you have a groups of elements and/or compounds that interact, but do not bond and are still separate by physical means, you have a mixture.

These worksheets really help students completely understand the differences between an element, compound, and mixture. We also take a deep dive into how this all relates to the Periodic Table of Elements. We look at extended classifications of each category of matter. We also look at how to get compounds and mixtures to form, as well as how to physically separate mixtures.

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An element is a substance that is composed entirely of one type of atom. Everything in the world is made up of elements. Some common elements are oxygen, hydrogen, carbon, gold, iron, and helium.

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An element can be either a solid, a liquid, or a gas. The form that it is in is called its standard state. When an element is in its standard state, it has the same number of electrons as it has protons.

The Periodic Table

Elements are organized according to the structure of their atoms in a chart called the periodic table. On it, the name of each element is abbreviated.

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QUESTIONS: The Periodic Table

The periodic table is so called because the element are grouped in cycles or "periods." From left to right, the table lists elements in rows based on their atomic number.

Binary Compounds

The tendency of any given atom to form a bond depends on how many electrons it has in its outer shell.

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Question Set: Binary Compounds

All scientists, all over the world, name compounds in the same way, based on how the molecule is constructed.


Mixtures can be either homogenous or heterogeneous. When a mixture is homogenous, the substances being combined are distributed evenly throughout the mixture.

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Question Set: Mixtures

There are several types of homogenous mixtures. In a solution, one substance (the solute) dissolves completely into another (the solvent).

Homogenous Mixtures

One type of homogenous mixture is called a solution. In a solution, one substance (the solute) dissolves completely into another (the solvent).

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Question Set: Homogenous Mixtures

Most homogenous mixtures can be separated again, although the process can be complex and involve multiple phases.

Heterogenous Mixtures

A suspension is a liquid is mixed with a solid. Instead of dissolving when mixed, the particles remain "suspended" throughout the liquid and can easily be seen with the naked eye. If a suspension is left alone long enough, the solid particles separate from the liquid and settle.

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Questions: Heterogenous Mixtures

A colloid is a type of mixture in which tiny particles of one substance are distributed uniformly throughout another substance.

Methods of Separating Mixtures

There are several different ways to separate mixtures. The method by which the substances in a mixture are separated is called a process.

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Methods of Separating Mixtures Question Series

Distillation is the process of boiling in order to separate the components of liquid solutions.


A mixture results when two substances are combined, but not combined chemically. Because no chemical reaction has occurred, mixtures can be easily separated, the original components retain their individual properties, and the proportion of the component substances can vary.

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Question Set: Solutions

A solution has identifiable characteristics. The substances in a solution are completely uniform (homogenous) throughout.

Compounds and Chemical Bonds

When multiple elements bond together during a chemical reaction, the result is called a compound. Compounds act like a single substance.

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Compounds and Chemical Bonds Questions

The number of electrons in an atom's outer shell that are available to participate in the process of chemical bonding are called valence electrons.

Elements vs. Compounds

An element is a substance that is composed entirely of one type of atom. There are 118 known elements. A compound is a substance that is formed when multiple kinds of elements are joined together by a chemical bond.

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Elements vs. Compounds Questions

Like elements, compounds have both names and symbols. The name of a compound depends on how it is constructed. The name of a compound indicates both what kind of elements comprise it, and how many atoms of each element are present in each molecule of the compound.