Really need with my chemistry question

The reaction q+r2=r2q is found to be first order in r2 and

What three things determine the shape and size of a puddle when water is poured out onto a surface

Use the drop-down menus to label each of the following changes p for physical change and c for chemical change. the substance changes to a new substance. the original substance can be recovered. the color changes. gas is produced and given off. the substance changes size, shape, or volume.