One liter of air contains about 0.21 L of oxygen. When filled, the human lungs hold about 6.0 L of air. How much oxygen is in the lungs when they are filled with air? (Round off to the nearest hundredths place.)

A balanced chemical equation must have the same number of which of these on both sides of the equation? A) atoms B) reactants C) molecules D) compounds

What compound composes most of the cell membrane?

What did Democritus teach? A that all matter was composed of tiny atoms B that all mater was composed of earth, fire, water, and air C that atoms could be divided into smaller particles D that experiments should be done in a systematic way

A mixture in which the substances are not evenly mixed

In which one of the following pairs do the two species resemble each other most closely in chemical properties: (a) 1H1 and 1H1 + (b) 14N7 and (14N7) - 3, (c) 12C6 and 13C6? Explain.

What family is the mineral lead in?

What is a greenhouse gas?

What symbol of xenon would be a part of the noble gas notation for the element?

Why do you think the process to create a protected area takes so long?

Calculate the molarity of a solution prepared using 127 grams of KCI with a volume of 552 mL