Approximately how many moles of N2 are in 200 moles of clean dry air?

A substance in a beaker has a temperature of 22 degrees Celsius. At 1:00, you begin to heat it. After 14 minutes, its temperature reaches 48 degrees Celsius, and you stop heating it. By 2:03, it has cooled back down to 22 degrees Celsius.

Which elements have the least attraction for electrons

A fossilized leaf contains 24% of its normal amount of carbon 14. how old is the fossil (to the nearest year) ? use 5600 years as the half-life of carbon 14.

In most Acid-base reactions, what type of bond (ionic or covalent) is formed between the ions of the "salt"? What happens to the electrons in this sort of bond? Are they transferred, or shared?

Find the Molarity of a solution containing 2.5 moles of solute in 15000 milliliters.

Why is gold less reactive than iron?

Which statements about isozymes are true? Isozymes catalyze different reactions. Isozymes have identical kinetic properties. Isozymes are present in various developmental stages. Isozymes are encoded by the same gene.

A fog over a lake. what two changes of state must occur to produce the fog? do the water molecules absorb or release energy during these changes of state? what happens to the motion of the water molecules as a result?

Limes have a [H3O+] of 1.3 x 10-2 mol/L. Their pOH is

The human body is 0.0040% iron. How many milligrams of iron does a 165 pound person contain?