Given a scientific passage and an answer, generate a question for the given answer.

[Q]: Passage: Most chemical reactions in organisms take place in an environment that is mostly water. Answer: water
[A]: The environment where most chemical reactions in organisms takes place consists mostly of what?

[Q]: Passage: Physical properties include color, density, hardness, and melting and boiling points. Answer: physical
[A]: Hardness, density, color, and melting and boiling points are all considered what types of properties?

[Q]: Passage: A chemical bond is a force of attraction between atoms or ions. Bonds form when atoms share or transfer valence electrons. Answer: chemical bond
[A]:
What bond is a force of attraction between ions and atoms?