Which element above has 6 protons in its nucleus?

a. oxygen

b. carbon

c. phosphorus

d. sulfur?

Which of the following is true about petroleum? O It emits harmful radiation. O It is the most expensive fuel. O It produces greenhouse gases. O It provides a clean source of energy.

Calculate the percent activity of the radioactive isotope strontium-89 remaining after 5 half-lives.

What is the solubility of salt in water at room temperature

What property of an atom determines its general reactivity

Which waves have the longest wavelength and lowest energy on the electromagnetic spectrum? a.) X-Rays b.) infrared c.) radio d.) gamma rays

Explain how the molar mass of a gas affects the rate at which the gas diffuses and effuses

Wat is a redox reaction

What is the difference between an organic and inorganic molecule

The variable that you plan to change during the course of an experiment is?

It is often necessary to prepare a dilute solution from a more concentrated solution rather than starting from a solid and just dissolving it then adding water. This technique is called serial dilution.