Which statement best characterizes chemical reactions?

They always occur very quickly.

Their rates vary significantly.

Their rates are always slow.

They rarely occur in the natural environment.

A population of ground squirrels lives in underground burrows several miles from an ocean shore. If a hurricane strikes the shore, which effect of the hurricane would probably do the most damage to the squirrel population? A. thunder B. lightning C.

Ava observes that a certain species of bird follows behind a herd of cattle. The bird species primarily eats insects. The birds stay with the herd of cattle as they graze.

Nuclear decay can change one element into another one

How is gold related to suns life cycle?

How can two atoms of the same chemical element be different? A. They may be different allotropes of the element. Each allotrope of the same element has a different number of electrons. B. They may be different isotopes of the element.

Nitrogen dioxide (NO2) gas and liquid water (H2O) react to form aqueous nitric acid (HNO3) and nitrogen monoxide (NO) gas. Suppose you have 5.0 mol of NO2 and 11.0 mol of H2O in a reactor. Suppose as much as possible of the NO2 reacts.

How long does it take the Earth to rotation and revive

What is Charles' law formula?

Which stars have the highest absolute brightness? Select one: a. Supergiants b. Giants c. Yellow stars d. Dwarfs

What volume would 3.01•1023 molecules of oxygen gas occupy at STP?