Understanding chemical equilibrium is very important in understanding chemical reactions.

This substance undergoes a chemical change when heat is applied.

In this experiment, you can observe a chemical reaction.

I found an old box in the storeroom.

I attended an awards ceremony yesterday.

It's difficult to solve this formula.

We attended his memorial service.

The calculation of determinants is an important part of mathematics.

I learned how to create formulas in math class.

He created a formula to solve the problem.