Josie bought some frozen meat in a vacuum sealed package. What is one of the main reasons the manufacturer used this packaging?

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

An alloy contains 66 g of pure zinc. what is the percentage of zinc in the alloy? express your answer to two significant figures and include the appropriate units.

Rank the four gases (air, exhaled air, gas produced from from decomposition of h2o2, gas from decomposition of nahco3) in order of increasing concentration of co2