Complete this table, comparing the number of each type of particle. You will also need to count particles that include multiple atoms, as well as particles that are made up of a single atom.

First, record the number of each before they are mixed in the $"$# Before" column. Once the reaction begins, the camera will show a close$-$up inside the beaker.

Then, record the number of each after the reaction. You should record these numbers after the camera has zoomed back out to show the whole beaker and the bubbling has slowed down.

Only count hydrogen $($H$),$ chlorine $($Cl$),$ and calcium $($Ca$)$ when they are alone, not attached to any other atoms as part of a larger particle.