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Chemistry: Most Popular Articles

These articles are the most popular over the last month.
Heterogeneous and Homogeneous Mixtures: What's...
Heterogeneous and homogeneous refer to mixtures of materials in chemistry. The difference between heterogeneous and homogeneous mixtures is the degree at which the materials are mixed together.
Science Quiz - Test Your General Science...
Test your general science knowledge with this fun multiple choice quiz.
Know the Difference Between Baking Powder &...
Learn the difference between baking powder and baking soda and how to make ingredient substitutions if you're out!
How To Calculate Percent Error
Percent error or percentage error expresses as a percentage the difference between an approximate or measured value and an exact or known value. Here is how to calculate percent error, with example calculations.
When Were the Elements Discovered? (Timeline)
This timeline shows when each of the elements was discovered. Discovery of an element is marked by the scientist isolating the element in its pure form. The timeline also lists the discoverer's name and year of discovery.
10 Examples of Chemical Changes That We...
Get examples of 10 chemical changes.
Understand the Difference Between Independent...
The difference between independent and dependent variables in a scientific experiment is which variable is being measured. Here's an explanation of how to tell these critical variables apart.
How Do I Substitute Between Baking Powder and...
Baking powder and baking soda both are leavening agents that help baked goods to rise. They are not the same chemical, but you can substitute one for another in recipes. Here's how.
10 Examples of Physical Changes
Physical changes involve a new form of matter, but no chemical reaction. This is a list of 10 examples of physical changes.
How to Write a Lab Report
Lab reports are an essential part of all laboratory courses and usually a significant part of your grade. If your instructor gives you an outline for how to write a lab report, use that. Here's a format for a lab report you can use if you aren't sure what to write or need an explanation of what to include in the different parts of the report.
Atom Basics Quiz - Test Your Chemistry Knowledge
Atom Basics Quiz - Test Your Chemistry Knowledge: structure quiz chemistry knowledge model of the atom question quiz science fundamentals
20 Chemistry Questions Quiz - 20 Chemistry...
Take a multiple choice quiz to test yourself about general knowledge in chemistry.
How to Calculate the Concentration of a...
Calculating concentration is a basic skill needed by chemistry students. This is a list of steps and examples to calculate the concentration of chemical solutions in percent composition by mass, volume percent, molarity, molality, and normality. Make dilutions by adding the correct volume of solvent to make a new solution.
Metric to Metric Conversions Quiz - Test Your...
Metric to Metric Quiz - Test Your Chemistry Knowledge
Independent Variable Definition
This is the definition of an independent variable.
Elements by the Numbers: From Hydrogen to...
Here's a list of chemical elements ordered by increasing atomic number. The names and element symbols are provided.
What Are the 7 Diatomic Elements?
There are seven elements that form diatomic molecules. This is a list of the seven diatomic elements.
Ionic Compounds Nomenclature Quiz - Can You...
This multiple choice quiz covers ionic compound nomenclature. Test your ability to name ionic compounds and to write the formula of ionic compounds from their names.
What's the Difference Between Ionic and...
Learn to distinguish between ionic and covalent bonds, and determine whether a bond will be polar or nonpolar.
What's the Difference Between Chemical and...
Here are some examples of physical changes and chemical changes, along with an explanation of how you can tell physical and chemical changes apart.
Control vs. Experimental Group: How Do They...
The difference between a control group and an experimental group is one group is exposed to the conditions of the experiment and the other is not.
How to Determine the Empirical and Molecular...
The empirical formula of a chemical compound is the simplest whole number ratio between the elements. The molecular formula is the actual whole number ratio between the elements. This step by step tutorial shows how to calculate the empirical and molecular formulas for a compound.
3 Ways To Calculate Atomic Mass
The atomic mass or atomic weight of an element is a weighted average of all the element's isotopes based on their natural abundance. It is simple to calculate the atomic mass of an element with these steps.
Scientific Experiments: What Is a Control Group?
A scientific experiment may be designed with a control group. Here's a look at what a control group is and how it helps increase the validity of an experiment.
What Is a Pure Substance?
A pure substance or chemical substance is a material that is homogeneous and has constant properties throughout the sample. Here are examples of pure substances.
Differences Between DNA and RNA
Although DNA and RNA both carry genetic information, there are quite a few differences between them. This is a comparison of the differences between DNA versus RNA, including a quick summary and a detailed table of the differences.
What Are Chemical and Physical Changes?
Find out what chemical and physical changes are, get examples, and learn how to tell them apart.
Periodic Table - Interactive Periodic Table of...
This is an interactive periodic table or chart of the chemical elements. Click on an element symbol to get detailed information for each element.
Science Experiments: What Are Variables?
Variables are an important part of science projects and experiments. Here is an explanation of what a variable is and a description of the different types of variables you'll encounter in science.
Chem Students Must Know these Polyatomic Ions
This is a list of some of the most common polyatomic ions. It is worth committing the polyatomic ions to memory, including their molecular formulas and ionic charge.
How to Calculate Mass Percent in Chemistry
Mass percent composition of a molecule shows the amount each element in a molecule contributes to the total molecular mass. This step by step tutorial will show the method to determine the mass percent composition of a molecule.
What's the Difference Between a Scientific...
Learn about the difference between a scientific law, hypothesis, and theory.
5 Simple Buttermilk Recipes
If you don't have buttermilk on hand, it's easy to apply a little kitchen chemistry to make buttermilk from regular milk. Here are 5 simple buttermilk recipes.
What Is the Difference Between Organic and...
Organic compounds and inorganic compounds form the basis for chemistry. Here is a look at the difference between organic and inorganic compounds, plus examples of each type.
Understanding Molecular and Empirical Formulas
Here is a look at what the molecular formula and empirical formula are and steps for finding the molecular formula and empirical formula.
Understand the Difference Between Accuracy and...
This is an explanation of the difference between accuracy and precision.
Functional Group Quiz - Test Your Recognition...
You see them all the time, but how well do you know your common organic functional groups? Take this quiz to see if you can match names to structures of functional groups. Put the FUN in FUNctional group!
What Is the Difference Between a Cation and an...
Cations and anions are both ions. The difference between a cation and an anion is the net electrical charge of the ion. Here are the details on the difference and how to tell them apart.
What Is an Isotope?
Isotopes definition, as used in chemistry, chemical engineering, and physics.
How to Convert Celsius to Kelvin
It is easy to convert Celsius to Kelvin with these steps.
What Is the Difference Between a Chemical...
Learn how to distinguish between a chemical property and a physical property of matter.
Working on a Science Project? Start With the...
Science fair and research projects apply the scientific method. Here's an explanation of the scientific method and how the scientific method is used.
Which Element Are You? - Element Personality Quiz
Which chemical element are you? Technically speaking, you mostly consist of carbon, hydrogen, and oxygen, but which element best represents your personality? Take this fun multiple choice quiz to find out.
What Is the Density of Water?
The density of water is related to its specific gravity. The density is the weight of the water per its unit volume, which depends on the temperature of the water. While you can round the density to 1 gram per milliliter, here are more precise values for you.
What Temperature Does Water Boil?
At what temperature does water boil? What determines the boiling point of water? Here's the answer to this common question.
Handy List of All the Element Symbols
Learn the one and two letter symbols for the chemical elements using this handy list.
How to Remove Ball Point Pen Ink
Ball point pen ink is not a something that you can usually remove with simple soap and water, but there is an easy and inexpensive way to remove pen ink from surfaces or clothing.
20 Science Questions Quiz - 20 Science Facts...
Take a multiple choice quiz to test yourself about general knowledge in science.
10 Examples of Chemical Reactions in Everyday...
Chemistry happens in the real world, not just a lab. Here are 10 examples of chemical reactions in everyday life.
Learn How to Use a Periodic Table
The periodic table of the elements contains a lot of information. Here is how to use a periodic table to gather information about the elements.
What Are Examples of a Hypothesis?
Here are examples of a scientific hypothesis and how to improve a hypothesis to use it for an experiment.
What Makes Water a Polar Molecule?
Water is a polar molecule. Here is the explanation for why water is a polar molecule and why water is a polar solvent.
Quick Chemistry Facts About the Ideal Gas...
Gas Constant (R) definition, as used in chemistry, chemical engineering, and physics.
What Is a Dependent Variable?
A dependent variable is the variable being tested in a scientific experiment.
Convert Grams To Moles - Sample Problem
This worked example problem shows how to convert the number grams of a molecule to the number of moles of the molecule.
What Is Borax and Where Can You Get It?
Borax is a common household and commercial chemical. Here's a look at what borax is, some facts about borax and how you can get borax.
Understanding Endothermic and Exothermic...
Learn about endothermic and exothermic chemical reactions and get instructions to perform your own hot and cold chemistry.
3 Steps to Writing Balanced Chemical Equations
Use these step by step instructions to write and balance chemical equations.
How To Memorize the Periodic Table
Get step by step instructions to memorize the periodic table of the elements, including printable tables and a blank practice table.
How to Calculate Mass Percent Composition
This is a worked example problem showing how to calculate mass percent composition.
How To Build a Classic Baking Soda Volcano
The chemical volcano is the classic science fair project. Baking soda and vinegar combine to produce carbon dioxide, which builds up pressure in the center to cause an eruption of foamy lava. You can even color the lava to resemble a real volcanic eruption. This step-by-step recipe will show you how to make your own baking soda volcano.
What Are the Types of Chemical Reactions?
Learn about the different types of chemical reactions and get examples of the reaction types.
Learn What Chemical Properties Are and Get...
Here is an explanation of what chemical properties are, plus several examples of chemical properties of matter.
What are Some Examples of Covalent Compounds?
These are examples of covalent bonds and covalent compounds.
10 Interesting Periodic Table Facts
The periodic table organizes the elements according to their periodic properties. Find 10 periodic table facts that are interesting and informative.
What's the Difference Between Intensive and...
Intensive propertes and extensive properties are types of physical properties of matters. Here's a look at what intensive and extensive properties are and examples of them.
What Are Some Examples of Compounds with Ionic...
Here are examples of ionic bonds and ionic compounds.
Know the Types of Chemical Bonds
Learn about the different types of chemical bonds and the forces that affect the way electrons are shared.
What Is the Difference Between Atomic Mass and...
There is a difference between the meanings of atomic mass and mass number. One is the average weight of an element and the other is the total number of nucleons in the atom's nucleus. Here's how to keep them straight.
Is It Okay To Drink Distilled Water?
Distillation is one method of water purification. Is distilled water safe to drink or as good for you as other types of water? The answer depends on a few different factors.
How Much of The Human Body Is Water?
Have you ever wondered how much of your body is water? The percentage of water varies according to your age and gender. Here's a look at how much water is inside you.
Big Collection of Printable PDF Periodic Tables
Download or print these PDF and PNG periodic tables to help work chemistry problems or to predict properties of the elements. The printable tables work well on mobile devices, too.
Learn How To Determine Significant Figures
Learn what significant figures are and how they are used with respect to scientific measurements and calculations.
Everything You Need to Know About Crystal Meth
Learn what crystal meth is, why people take crystal meth, how it's made, and what risks are associated with using methamphetamine.
List 10 Types of Solids, Liquids, and Gases
Get examples of types of solids, liquids, and gases and learn about the transitions or phase changes between them.
How to Calculate Theoretical Yield of a...
Before performing chemical reactions, it is helpful to know how much product will be produced with given quantities of reactants. This is known as the theoretical yield. It is also helpful to predict how much reagent you will need in order to produce a specific amount of products. This is a strategy to use when calculating theoretical yield of a chemical reaction.
What is the Bohr Model of the Atom?
The Bohr Model has an atom consisting of a small, positively-charged nucleus orbited by negatively-charged electrons. Here's a closer look at the Bohr Model, which is sometimes called the Rutherford-Bohr Model.
What Is a Mixture?
Two or more substances which have been combined such that each substance retains its own chemical identity.Flour and sugar may be combined to form a mixture.
Chemical Bonds & Compounds Chemistry Quiz
Chemical Bonds & Compounds Chemistry Quiz: electron dot structures ionic covalent bonds lewis electron dot structures chemistry quiz chemistry quizzes
Learn Chemistry with this Periodic Table Study...
See how elements are organized into element groups in the periodic table. Page 2.
Learn Key Acids and Bases Definitions
Understanding acids and bases is important for grasping chemistry concepts. Here's an introduction to acids and bases, with definitions for key acid and base terms.
Why Is Water the Universal Solvent?
Water is known as the universal solvent. Here is an explanation of why water is called the universal solvent and what properties make it good at dissolving other substances.
Functional Groups - Organic Chemistry
Functional groups are collections of atoms in a molecule that participate in characteristic reactions. If you are taking organic chemistry, it's a good idea to memorize important functional groups or at least bookmark a past listing functional groups so that you can refer to it.
What Is the Equation for the Reaction Between...
The reaction between baking soda and vinegar generates carbon dioxide gas, which is used in chemical volcanoes and other projects. Here is a look at the reaction between baking soda and vinegar and the equation for the reaction.
Check Out These Natural Mosquito Repellents
Learn about natural ways to repel mosquitoes and develop strategies to reduce your exposure to them.
Element Picture Quiz - Test Your Recognition of...
Can you recognize the elements when you see them? Here's a quiz that tests your ability to identify an element based on its appearance.
Ionic Compound Nomenclature Explained
This is a summary of the past and present nomenclature or naming conventions for ionic compounds. The major prefixes and suffixes are explained and examples of their use are provded.
What Is an Atom?
The building blocks of matter are called atoms. Yet you may be wondering what, exactly, is an atom? Here's a look at what an atom is and some examples of atoms.
Interesting High School Science Project Ideas
Get ideas for great high school science projects. These are projects targeted from the 9-12 grade educational level.
Element Groups - Periodic Table of the Element...
Groups of Elements - This is an interactive periodic table of the elements.
Why You Shouldn't Mix Bleach and Ammonia
Mixing bleach and ammonia is extremely dangerous, since toxic vapors will be produced. The primary toxic chemical formed by the reaction is chloramine vapor, with a potential for hydrazine formation. Here's a look at the chemical reactions involved in mixing bleach and ammonia, as well as some first aid advice if you accidentally become exposed to a bleach and ammonia mixture.
Make Your Own Dry Ice with These Tips
It's possible to make dry ice at home. Here are instructions and safety information on how to do it.
Periodic Table Quiz - Test Your Periodic Table...
Test your periodic table knowledge with this fun multiple choice quiz.
Get a List of Physical Properties of Matter
This is an extensive list of physical properties of matter. It's especially useful if you need to cite examples of physical properties.
An Easy Way to Calculate Molarity of a Solution
Molarity is a unit of concentration measuring the number of moles of a solute per liter of solution. The strategy to solving molarity problems is fairly simple. This outlines a straightforward method to calculate molarity of a solution.
Metals Nonmetals and Metalloids - Periodic Table
This is a periodic table of the metals, metalloids, and nonmetals and a description of these major element groups.
Try These 8th Grade Science Project Ideas
Get ideas for 8th grade science fair projects. These are experiments and topics suitable for upper middle school level science fair projects.
List of All the Elements That Are Metals
Most elements are metals. This group includes the alkali metals, alkaline earth metals, transition metals, basic metals, and rare earth elements.
What Properties Make Metals Unique?
Most of the chemical elements are metals of one variety or another. Learn about some of the properties common to this large element group.
What Does pH Stand For?
Have you ever wondered what pH stands for or where the term originated? Here is the answer to the question and a look at the history of the pH scale.
Which Elements Are in the Human Body?
Here is a list of the elements in the human body.
Metals vs. Nonmetals: What's the Difference?
Elements may be classified as either metals or nonmetals, based on their properties. Here's a look at the differences between the metals and nonmetals.
Are Apple Seeds Poisonous?
Apple seeds do contain a small amount of cyanide, which is a lethal poison, but humans are protected from it in several ways.
Cool Things to Do with Liquid Nitrogen
Are you looking for an activity or project with liquid nitrogen? This is the most extensive list of liquid nitrogen ideas you're likely to find, plus you're welcome to add your own suggestions.
What Is Atomic Mass or Atomic Weight?
Atomic Mass definition, as used in chemistry and other physical sciences.
Is Dissolving Salt in Water a Chemical Change...
Is dissolving salt in water an example of a chemical change or a physical change? Here's a look at the process that occurs when you dissolve salt in water and an explanation of the answer to the question.
Anode vs. Cathode: What's the Difference?
Here is how to define anode and cathode and how to remember which is which.
Balancing Equations Practice Quiz
Practice balancing chemical equations with this multiple choice quiz.
How to Make a Bouncing Polymer Ball
Use chemistry to make a bouncing polymer ball, then alter the procedure to see the effect the changes have on the characteristics of the bouncing ball.
What Is the Mole Unit of Measurement?
Find out what a mole is and why this unit is used in chemistry.
Hazard Symbol Quiz - Test Your Recognition of...
How well do you know laboratory safety signs and hazard symbols? Take this fun quiz to see if you can recognize potential dangers in the lab.
Basics of Acids and Bases Quiz - Test Your...
Basics of Acids and Bases Quiz - Test Your Chemistry Knowledge
What Is the Law of Conservation of Mass?
Law of Conservation of Mass definition, as used in chemistry, chemical engineering, and physics.
What You Need to Know to Calculate pH
Review how to calculate pH and what pH means with respect to hydrogen ion concentration, acids, and bases.
How to Convert Kelvin to Celsius in 1 Step
It is easy to convert Kelvin to Celsius with these steps.
Element Symbol Quiz - Element Symbols for the...
Take a multiple choice quiz to test yourself about the symbols for the first 20 elements.
6th Grade Science Quiz - Test Your 6th Grade...
Test your 6th grade general science knowledge with this fun multiple choice quiz.
Is Dissolving Sugar in Water a Chemical or...
Is dissolving sugar in water an example of a chemical or physical change? This process is a little trickier to understand than most, but if you look at the definition of chemical and physical changes, you'll see how it works. Here's the answer and an explanation of the process.
Learn About Combustion Reactions
This is an overview of combustion reactions, including what they are, the general format for the reaction, and examples of combustion reactions.
Can You Drink too Much Water?
Is it really possible to drink to much water? Learn about water intoxication and hyponatremia.
What Is the Freezing Point of Water?
What is the freezing point of water or the melting point of water? Are the freezing point and melting point the same? Are there any factors that affect the freezing point of water? Here's a look at the answers to these common questions.
Chem Students Should Know These Acid and Base...
Here are the names and formulas of some of the common acids and bases.
Examples of Endothermic Reactions
This is a list of chemical reactions that are endothermic reactions.
What are the Solubility Rules?
This is a list of the solubility rules for ionic solids in water.
Learn About Monomers and Polymers
Monomers are the building blocks of more complex molecules, called polymers. Polymers consist of repeating molecular units which usually are joined by covalent bonds. Here is a closer look at the chemistry of monomers and polymers.
Getting a Degree in Chemistry? Check Out These...
Here's a look at some of the career options available to you in the field of chemistry.
Compound Names Chemistry Quiz
Compound Names Chemistry Quiz: multiple choice test chemistry quiz chemistry quizzes ionic compounds mineral chemistry
What Is Alum?
Find out what alum is and the uses of alum.
What Are Solutions, Suspensions, Colloids, and...
Learn how to distiguish between solutions, suspensions, colloids, and dispersions. Get examples of the different types of mixtures.
Chemistry 101: What Chemistry Is and Why You...
Start learning chemistry with the basics. Learn what chemistry is, what chemists do, and why it's important to study chemistry.
Chemistry: What is a Solution?
Solution definition, as used in chemistry, chemical engineering, and physics.
Types of Lipids and Where They Are Found
Lipids are a diverse group of biological molecules. Here is a look at different types of lipids and where they are found.
An Easy Way to Memorize the First 20 Elements
Here is a mnemonic device to help you memorize the first 20 elements in the periodic table.
What Is STP in Chemistry?
Here's an explanation of what STP is in chemistry and why it is useful, particularly when dealing with gases.
Explanation and Examples of Physical Properties
Here is an explanation of what physical properties are and examples of several physical properties.
Remove Rust Stains Quickly and Easily at Home
Rust stains can be a challenge to remove because some treatments actually set the stain rather than remove it. Use a little chemistry know-how to successfully remove a rust stain.
What Do Chemical Engineers Do?
Are you confused about how chemical engineering differs from pure chemistry or other types of engineering? Here's an explanation of what chemical engineering is and what chemical engineers do.
How Can I Get Fluoride Out of My Water?
Learn how to remove fluoride from drinking water.
How to Calculate Normality
The normality of a solution is the gram equivalent weight of a solute per liter of solution. Here's an example of how to calculate the normality of a solution.
Why Does Ice Float?
Learn about hydrogen bonding and density to understand why ice floats.
A List of the Strong Acids
These are the strong acids. There are only six strong acids, so you might want to commit the list of strong acids to memory.
A Quick Review of Accuracy and Precision
Here's a quick review of the concepts of accuracy and precision.
What Is the pH of Water?
The pH of water is a value you should know, plus it's good to understand why the actual pH of water might differ from the theoretical value.
Properties of Nonmetals
Get information about the common characteristics of the nonmetals.
What Is the Chemical Composition of Air?
Learn about chemical composition of the Earth's air. Percentages of the most common compounds are given, according to volume.
Learn the Metric Unit Prefixes
Metric units of measurement are all based on units of ten. Here is a list of the most common metric unit prefixes.
How To Make Saline Solution at Home
Saline solution refers to a salt solution, which you can prepare yourself using readily available materials. The solution can be used as a disinfectant, sterile rinse, or for labwork.
Why Do You Add Salt to Boiling Water?
Why do you add salt to boiling water? There are a couple of answers to this common cooking question. Here's a look at the reason for salting water.
What Is a Physical Property?
This is the science and engineering definition of a physical property.
Absolute Error and Relative Error Calculation
This is an example of how to calculate absolute and relative error.
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