When you mixed 20 grams of magnesium and an excess of nitric acid, 1.7 grams of hydrogen was actually produced. what is the percent yield of hydrogen during this reaction?
mg + 2hno3 mg(no3)2 + h2
3.3 %
48.5 %
25.7 %
102 %
98 %

Put these processes of the water cycle in the correct order, starting at the point where the water is in the lake: 1. water evaporates into the atmosphere 2. rain, snow, or other precipitation falls 3. water collects into larger bodies of water 4. water vapor condenses into liquid water

Which of the following statements is true? a. elements in the last period are radioactive. b. atomic weight is the same as atomic mass. c. elements in the same group have the same number of electron shells. d. atomic number equals the number of neutrons in the nucleus of an atom.

Flourine is found to undergo 10% radioactivity decay in 366 minutes determine its halflife