Give formula for iron (III) oxide

In salt water solution,the salt is the blank

Which of the following is a physical property flammability heat of combustion solubility and toxicity

Scientists often have to deal with numbers that are either very large or very small. for example, the radius of the sun is approximately 696,000 kilometers, while bacterial cells are as small as 1.9 × 10-4 millimeters. express each number in an alternate form.