How many moles of iron are present in 3.15 × 1024 atoms of iron?

Why should the scientific method be used to answer a question? a. it provides a way to test an idea without any bias. b. it provides a way to test a hypothesis. c. it provides a way to ensure all hypotheses are proven correct. d. it provides a way to quickly turn a hypothesis into a scientific theory.

Particles vibrate in a rigid structure and do not move relative to their neighbors.

Why do cells appear different in distilled water than they do in 10% salt water?