In chemistry, the mole is a unit of measurement, much like a millimeter or liter. After learning about moles, scholars learn various equations relating to mass, volume, and concentration. They review each of these equations in a few...

Scientists call ions with a negative charge anions. Scholars work through one matching puzzle and four logic puzzles reviewing the chemical formulas for anion ions. Each level increases in difficulty and solidifies the concept in pupils'...

When two liquids combine and a solid forms, the new substance is called a precipitate. Scholars test their knowledge of hydroxide precipitates and their properties. A series of four increasingly difficult puzzles challenge their logic...

Flame tests determine if there is a specific metal in a chemical compound. Young forensic scientists review their understanding of flame tests and hydroxide precipitates by solving puzzles. The timed review encourages mastery.

Fats and oils often contain esters, which sometimes find their way into perfumes due to their pleasant smells. Scholars match the name of esters made from four different types of alcohol and four different types of carboxylic acids....

The United States consumes more oil than any other country, and its residents use 50 percent of that for transportation. Scholars match eight fractions of crude oil to their applications. Then, they fill in three logic puzzles reviewing...

Because they are reactive with air and water, scientists store alkalis in oil. Scholars complete a series of four puzzles reviewing information about alkalis. They match the alkali to its formula, the salt formed with H2SO4, and the salt...

Ethanol, a grain alcohol, reduces emissions and conserves petroleum when mixed into gasoline. Four puzzles challenge pupils to match alcohols to their structural formulas, types of alcohol, and full oxidation products. Each puzzle...

She threw sodium chloride at me—that's a salt! Scholars match acids to their formulas as well as their salt compounds. Completing a series of three gridlock puzzles reinforces each of the matches in a logical manner.

All rocks include two or more minerals but greatly vary in appearance. The online interactive encourages scholars to match the rock types to the facts they know about each. They then complete three grid puzzles reviewing the same...

Did you hear about the chemist reading the book about helium? He couldn't put it down. Scholars match 12 chemical elements, including helium, to their symbols. Then they complete three Sudoku-style puzzles using these names and symbols...

While the periodic table looks complex, it is really arranged by only two variables, atomic number and electron configuration. The set of four puzzles focuses on groups 3, 4, 5, and 6 or 13, 14, 15, and 16, depending on your periodic...

Richard Feynman predicted the periodic table might go up to number 137—but never to 138. Scholars practice naming which elements belong in groups 1, 2, 7, and 0 on the periodic table in puzzles. They work through four puzzles reinforcing...

Penguinone is an organic compound named because it resembles a penguin. Scholars match the name of binary compounds to the elements in each compound. Then, they solve three sets of puzzles reviewing the same content.

Many people confuse the chemical formulas for copper carbonate and copper oxide. A set of challenging puzzles review commonly confused compound names and their symbols. Through a series of four puzzles, pupils match the names and...

Caustic soda helps break up clogs in drains in many homes. Scholars match 10 chemical names to their everyday names; for example, caustic soda is sodium hydroxide. Then, they complete three different grid puzzles practicing this skill.

Many pupils mix up the chemical symbols for calcium, carbon, and copper. These entertaining puzzles help scholars remember the names and symbols. First, they match the name and symbol of 12 elements. Then, through a series of three...

Starting in 2015, all chemicals must have a pictogram of the associated chemical hazards. A brain-building activity reviews four of the basic symbols found in a typical science laboratory. Through a fun puzzle, scholars apply their...

Don't miss the silver lining when you are looking for gold. A brain-bending interactive allows scholars to sharpen their puzzle skills while reviewing chemical elements, including silver and gold. First, pupils match 12 chemical elements...

Bacteria outnumber all other forms of life on Earth. Scholars observe the growth of bacteria in petri dishes to understand their role in maintaining good health. Then, they observe the growth of bacteria after they introduce...

The radical reactions of polymers seems abstract to many pupils, but this lesson turns them into a fun building game. Scholars use dice and building pieces to build polymers. Then, they determine the theoretical and experimental weight...

Stars exist from a few million years to over 10 billion years, depending on their mass. Scholars perform a play acting as stars to learn about their different life cycles. They develop an understanding of many of the fundamental concepts...

Sometimes conservationists use specific plants to prevent erosion or fight invasive species. A 50-slide presentation covers both nonvascular and vascular plants. It discusses the plants, their stages and life cycles, reproduction, uses,...

Our body manufactures antibodies that are the exact shape for the antigens it encounters. The simulation shows a 3-D model of an antibody and antigen pairing. It allows young scientists to explore the complementary shapes.