A solution has a concentration of 40 g. L-1 . We take 20 mL of this solution and add water. The

final volume is 40 mL. What's the new concentration? No calculations but you need to

justify​

Match term definition ellipse a) diagonal cross section of a cylinder circle b) diagonal cross section through the widest part of a sphere sphere c) cross section parallel to the base of a cone great circle d) shape created when a semi-circle is rotated around the y-axis triangle e) perpendicular cross section of a cone

The number of moles of a given mass of a substance can be found without knowing its molecular formula or molar mass. true false

Afusion reaction takes place between carbon and another element. neutrons are released, and a different element is formed. the different element is a) lighter than helium. b)heavier than helium. c)the same weight as helium. d)dependent on the element that reacted with carbon.