What group of elements satisfies the octet rule without forming compounds?

How does adding energy as heat to a system may result in a change of state

The halogens are a highly reactive group of nonmetal elements that include fluorine, chlorine, and helium. True False

When a substance melts, is energy being added or removed?

Which of the following best characterizes the structure of diamond? a. a thin sheet b. a cubic lattice c. a round shape d. a crystalline matrix

How does the value of Ka and Kb compare with the concentrations of hydronium ion and hydroxide ion? Ka X Kb = [H3O+][OH-] Ka X Kb> [H3O+][OH-] Ka X Kb< [H3O+]+[OH-] Ka X Kb + [H3O]/[OH-]

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?

The properties of elements are arranged by ... A. mass numbers B. atomic masses C. atomic radii D. atomic numbers

When a tire is inflated with air is it a chemical or physical change?