Which of the following statements does not describe the alkali metals? a. most are shiny gray solids that are very soft. b. they easily gain an electron to form ions with a charge of –1. c. they are not found uncombined in nature. d. they react with water to form alkaline solutions.

Which of these is the result of scientific research and not engineering? a. a new shoe design that features air cushioning for more comfort and protection b. the creation of glass with uv protection. c. a conclusion about diet commonalities among diabetics. d. the development of a smaller, more compact missile.

#20 which type of bond is formed when bases pair in dna? ionic bond covalent bond coordinate bond hydrogen bond

Mercury turns to a vapor at 629.88 k. how much heat is lost when 75.0 g of mercury vapor at 650 k condenses to a liquid at 297 k?