Matrices help solve systems of equations in chemistry, computer graphics, circuitry, probability, and more. The second instructional activity in a seven-part series focuses on using matrices to balance chemical equations. Pupils rely on...

Young scholars illustrate the concept of balancing equations using a Four-Pan Algebra Balance. In this balancing lesson, students visualize why it is necessary to add or subtract the same quantity on both sides of an equation when...

Many people confuse atomic mass and atomic numbers. The sixth of seven lessons in a unit requires scholars to find the weight of different groups of pennies. Then, they must solve how many of each type of penny exists in a closed system...