In a reaction, you combined 30 g of oxygen gas and an excess of hydrogen gas. They reacted to produce 29.7 g of water, according to the following reaction:
H2(g) + O2(8) ---> H2O(1)
a. What is the actual yield of H2O? 29.78
b. How many grams of water should you have been able to produce? (theoretical yield) ( Select ]
c. What is the percent yield? (Select]

An occluded front moves over the farmland that has been experiencing drought conditions. what change in weather will this front likely bring? a. gray skies, but no rain b. an extended period of rain c. more dry air and sunny skies d. violent, short-lived thunderstorms

Which statement best describes the relationship between period and frequency of light waves? a) in wave b the period increases and the frequency decreases from wave a. b) in wave a the period increases and the frequency decreases from wave b. c) in wave b the period is shorter and the frequency is greater than in wave a. d) in wave a the period is shorter and the frequency is greater than in wave b.

Compare and contrast physical changes with chemical changes.