code: protected void growChemModelArray() {
          ChemModel[] newchemModels = new ChemModel[chemModels.length + growArraySize];
          System.arraycopy(chemModels, 0, newchemModels, 0, chemModels.length);
          chemModels = newchemModels;
      }
docs: Grows the chemModel array by a given size.
  
  @see    growArraySize