You can put out a chip pan fire by putting a damp cloth over the pan. Explain why this works.

What is the hydrogen ion concentration of a substance with a pH of 4.5?

What is one source of human stem cells other than embryos

Which reaction below represents the electron affinity of li? which reaction below represents the electron affinity of li? li (g) + e - → li - (g) li (g) + e - → li + (g) li + (g) → li (g) + e - li (g) → li + (g) + e - li + (g) + e - → li (g) ?

In a ventilated hood in a lab, a student heats barium metal over a flame, and it begins to react with oxygen gas in the air. A white crystalline compound begins to form on the burning barium.

The lid on a jar is an example of which simple machine?

How marly electrons are in an atom of elemental sodium?

Petroleum and coal can be mined from the continental shelf. t/f

A solid substance turns into a liquid. Which best describes this change?

List two things you know about nonrenewable energy

Does a mole of hydrogen have the same mass as a mole of oxygen? explain your answer.