What are tiny air sacs of the lungs where oxygen and carbon dioxide are

exchanged?

•pharynx

•larynx

•bronchi

•alveoli

A reaction has a rate constant of 0.0396 sec-1; how long will it take (in minutes) until 0.292 mol/L of the compound is left, if there was 0.803 mol/L at the start? (give answer to 3 decimal places) ?

How many electrons will fluorine gain or lose in forming an ion

How many significant gigures are in each mesasurments 303,000mm

How many moles of O2 react with 5.75 moles of Fe?

The embryo refers to an undeveloped animal or plant. True or false

Plastic, rocks, and steel are all matter. They are made of tiny particles that can't be broken down into smaller pieces. These particles are called:

The palm tree with island is a population or biome or community

A gene is a section of dna within a chromosome that codes for a

An electron charge e mass m and a positron charge e mass m revolve around their common center of mass under the influence of their attractive coulomb force Find the speed v of each particle in terms of e m k and their separation L

Find the density of an object with a volume of 2.5 cm3 and a mass of 8.0 g.