  Before it rains, if using granular fertilizer, so that it will melt into the soil and become available for use by the plant roots.....IF you are using liquid fertilize â¦ r you would apply it either on the leaves, or by drenching the soil around the plant at least 24 hours before a rain occurs. Before it rains, if using granular fertilizer, so that it will melt into the soil and become available for use by the plant roots.....IF you are using liquid fertilize â¦ r you would apply it either on the leaves, or by drenching the soil around the plant at least 24 hours before a rain occurs.
Physical and Chemical Changes. There are several differences between a physical and chemical change in matter or substances. A physical change in a substance doesn't change what the substance is. In a chemical change where there is a chemical reaction, a new substance is formed and energy is either given off or absorbed. For example, if a piece of paper is cut up into small pieces it still is paper. This would be a physical change in the shape and size of the paper.
physical change is a change in a substance that does not change its chemical composition. It would fall in one of the following categories: a change in size only (such as tearing a piece of paper in two), a change in concentration only (such as adding more water to a black cup of coffee), a change in physical state only (such as melting a solid into a liquid, vaporizing a. liquid into a gas, or dissolving a sample in a solvent). A chemical change (also referred to as a chemical reaction) does involve a change in the. chemical composition, such as the rusting of iron (Fe changing to Fe.