Question 20 a raindrop has a mass of 50.mg and the pacific ocean has a mass of ×7.081020kg . use this information to answer the questions below. be sure your answers have the correct number of significant digits

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.

Give the set of reactants (including an alkyl halide and a nucleophile) that could be used to synthesize the following ether: draw the molecules on the canvas by choosing buttons from the tools (for bonds and charges), atoms, and templates toolbars, including charges where needed. ch3ch2och2ch2chch3 | ch3

Acontrol during an experiment. might change remains constant does not exist does change