13. In the reaction: A + B = C, if 4.2 grams of A react to make 6.8 grams of C, then how many grams of B were reacted? Hint: Mass, like charge and energy, is conserved in all reactions. pls i need quick help

When would a bouncy ball have the most potential energy

8.98 dm3 of hydrogen gas is collected at 38.8 °c. find the volume the gas will occupy at -39.9 °c if the pressure remains constant.

Pastoral farming is best described as a. a method of raising livestock and moving herds b. an african method of agriculture c. a method of cultivating crops on poor soils d. a common method of desert farming select the best answer from the choices provided a b c d