14) Oxygen-15 has a half-life of 2 minutes. How old is the substance after 5 half-lives?

Refer to the following balanced equation in which ammonia reacts with nitrogen monoxide to produce nitrogen and water. 4NH3 (g) + 6NO (g) yields 5N2 (g) + 6H2O (l) How many moles of NH3 are necessary to produce 0.824 mil N2?

Approximately how much of the world's freshwater supply comes from groundwater? 5% 10% 15% 20%

What four properties are used to classify stars?

Which statement best compares the properties of compounds and elements that the compounds contain?

What days did the Catholic Church h celebrate with fireworks

Several scientists are working together to study the change in the number of whales born each year along the northern coast of California. What is the controlled parameter

Which type of reaction is C12H22O11 → 12C + 11H2O? synthesis decomposition oxidation combustion

At a certain temperature this reaction follows first-order kinetics with a rate constant of 0.184 s^-1? Suppose a vessel contains Cl_2 O_5 at a concentration of 1.16 M. Calculate the concentration of Cl_2 O_5 in the vessel 5.70 seconds later.

When your heart doesn't know what it wants ... what do you do?

Cellulose, chitin, and peptidoglycan function as structural molecules and are extraordinarily resistant to degradation and decay. which structural feature is most directly responsible?