Given the following chemical equation, if 162.0 grams of potassium reacts with excess oxygen gas and was found to produce 172 grams of potassium oxide, what is the percent yield for this reaction?4 K (s) + O2 (g) - - > 2K2O (s)

44%

75%

22%

88%

Rank these elements according to first ionization kr, br, se, as, ge, ga, ca, k

Provide the mass number of Fe, which has 29 neutrons

Calculate the temperatureoC that 0.2 moles of gas in a balloon at 2.0 atmoccupies 2.0 L.

All but one is a method of passve transport in cells osmosis sodium/potassium pump facilitated transport

The terms vitrification, oxidation, water smoking, and flashing are all associated with: Select one: Select one: a. spanning openings with bricks or other masonry units. b. cleaning bricks after masons install them. c.

Altering the pressure of a system can affect the rate of a chemical reaction. true false

What does ice cream melt on a hot day which type of thermal energy transfer does this melting represents

For which purpose do biochemists insert human genes into bacteria? to find a cure for the common cold to produce insulin for diabetics to kill resistant strains of bacteria to evolve certain species of bacteria

Cracks in rocks chemical or mechanical

A large boulder falls from an underwater ledge and crashes on the floor of the ocean. A pod of dolphins is 800 meters away. Determine how long it takes for the sound of the crash to reach the dolphins. A) 0.5 sec B) 0.3 sec C) 2.3 sec D) 1.9 sec