Which of these is a mixture?

Carbon

Carbon dioxide

Air

Oxygen

A cell placed in a hypertonic solution will shrink in a process called crenation. A cell placed in a hypotonic solution will swell in a process called hemolysis.

Rank the following solutions from the highest [H3O+] (1) to the lowest [H3O+] (5). [H3O+] = 3.16 * 10-4 M [OH-] = 4.35 * 10-2 M pH = 1.05 pOH = 7.0 pOH = 4.0

True or false according to the principle of base pairing hydrogen bonds could form only between adenine and cytosine

Where does the ground shake the most during an earthquake

Copper is a metal that is used for many purposes. It is mined from the earth using various methods. Though the amount of copper in the Earth's crust is very large, if the mining of copper continues, it will eventually run out.

What is released when a election returns to a lower state of energy

Which of the following elements has its highest energy electrons in an "s" atomic orbital? radiium (Ra) neon (Ne) aluminum (Al) lanthanum (La)

About how long does it take for the Sun to make one rotation on its axis?

Does a physical change affect the identity of a substance

If the cost of electricity is 8 cents/kWh, how much will it cost to use the light for a whole year (365 days) ?