The spectrum of a distant star contains sodium lines that are offset from their normal position, as shown. what is the most a. the star is relatively hot. b. the star is relatively cool. c. the star is moving rapidly toward us. d. the star is moving rapidly away from us. likely explanation?

It is important to wear proper protective equipment in lab even when not actively performing experiments because accidents can affect any researcher, even one not working on an experiment. select the best answer from the choices provided

Given the following reaction: c3h8+5o2=3co2+4h20 how many grams of co2 will be produced 7 g of c3h8 and 98 g of o2

Which sentence about particles in matter is true? a. atoms are present in solids and liquids but not in gases. b. the particles of matter are in constant motion. c. the same kinds of atoms are found in different elements. d. when a solid changes to a liquid, the sizes of the particles change.