In this activity, you’ll use a simulation to learn about chemical reactions between atoms and molecules. Get started by following these steps: Go to the simulation Balancing Chemical Equations.
Click the simulation and select the introduction. Balance the three equations using the balance scale and graph tools.
When you’ve finished all three equations, go to the game and select level 2. Complete all five challenges.
Now use what you learned from the simulation to answer the following questions.

Part A
Based on your experience in the simulation, what do the numbers 3 and 4 refer to in 3NH4?