Air has 21% oxygen by volume. Oxygen has a density of 1.31 g/L. What is the volume in liters of a room that holds enough air to contain 55 kg of oxygen

Which list of elements contains only metals? A. carbon, iodine, tin B. tin, copper, carbon C. cesium, iron, copper D. iodine, carbon, argon

Fern, moss, volvox, mould liverwort, which one is a thallophyte

Which of the following refers to a situation in which the use of harmful gas emissions is balanced by the replenishing of renewable energy sources? carbon neutral carbon stability carbon footprint carbon alignment

Examples of reflex action

Which atom would it be most difficult to remove an electron from

What do you need in order to do a stoichiometric calculation? (Choose multiple) Balanced Chemical Equation Molar masses of compounds involved The type of reaction taking place Oxidation Numbers

The correct mathematical expression for finding the molar solubility (s) of sn (oh) 2 is:

18. which bond is most polar? H--F H--Cl H--Br H--I

What kind of reaction is ca (s) + h3po4 (aq) ca3 (po4) 2 (s) + h2 (g)

In the teapot dome scandal, what did the secretary of the interior albert fall lease