An astronomer has proposed a new theory about the evolution of the universe. What is the next step that the astronomer should take to make his theory reliable?

Mori walks into a restaurant. Upon smelling the food cooking, her mouth starts to water. Which system in the body detected the information and communicated it to the body? A. nervous system B. digestive system C. circulatory system D. immune system

Calculate the wavelength of a body of mass 96.0 mg and moving with a velocity of 30.0 m/s. The value of Planck's constant is 6.626 * 10-34 J s.

The mineral enargite is 48.41% cu, 19.02% as, and 32.57% s by mass. what is the empirical formula of enargite?

What can be explained by the Arrhenius theory?

Elements known for their limited chemical reactivity are

In an acid-base titration, of 20 ml of a m HCI solution with 1 m NaOH. How many ml of NaOH are needed

Which of the following is not a source of air pollution related to human activities

Objects and substances in motion is I

If you were to remove an electron from a sodium atom that has eleven protons, what would be the electrical charge of the ion?

The atomic mass of fluorine in 19.0 amu, so the molar mass is?