Multiple Choice Which of the following numbers are equivalent to 20%? Choose all that apply. A. 0.002 B. The fraction is 1 over 4. C. 0.20 D. one-fifth

Achemist reacted 57.50 grams of sodium metal with an excess amount of chlorine gas. the chemical reaction that occurred is shown. na + cl2 → nacl if the percentage yield of the reaction is 86%, what is the actual yield? show your work, including the use of stoichiometric calculations and conversion factors.

Which of the following statements is true? a. most heat energy is easily recovered and used for useful actions. b. friction causes molecules to vibrate more slowly. burning air and gasoline in an c. engine changes chemical energy into mechanical energy. it is impossible to d. change mechanical energy into mechanical energy.

Aconversion factor is a ratio of equivalent values used to express the same units in different quantities