Friction depends on the types of surfaces involved and how hard the surfaces push together.

True or False

How are the elements contained within a group on the periodic table related? (select all that apply.) ?

Which of the following subatomic particles has no charge? A. Neutrons B. Electrons C. Protons D. Nucleus

How many protons. are in all chlorine CI atoms

The number of electrons in a neutral atom of hydrogen (H) atom is

Which igneous rock is an extrusive rock?

If a fast moving car making a loud noise approaches and moves past the person what will happen as the distance between the two increases?

Which of the following would be an example of a trophic relationship? Select all that apply. photosynthetic plankton respiring oxygen into the ocean small marine life feeding on the algae and plankton that have descended to the ocean floor a

Fumaric acid is an organic compound composed of 41.39%, 3.47%, and the rest oxygen. If 0.288 mol of fumaric acid has a mass of 33.4 g, what are the empirical and molecular fomulas of fumaric acid

What is an isotope? Give an example of an element with isotopes.

Consider the reaction between liquid water and aqueous magnesium nitride to form solid magnesium oxide and ammonia gas. If magnesium nitride is present in excess, how many moles of water are needed to form 9.17*1023 ammonia molecules?