How do humans spread organisms around the world?

Tritium (half life = 12.3 y) is used to verify the age of expensive brandies. If an old brandy contains 1/16 of the tritium present in the new brandy, then how long ago was it produced

Which of the following is NOT an assumption of the kinetic theory of gases? Gas particles are in constant random motion. The volume of individual gas particles is zero. The particles in a gas are attracted to each other.

A balloon deflates to 3.4L from 6.7L. Calculate the work if the pressure is 3.1 atm. (Give your answer in L·atm) w = - P∆V

When the pentaacetate anomer obtained in this reaction is heated with zncl2 and acetic anhydride?

Helium is an inert gas that does not react with other substances to form compounds. Would it be correct to say that helium has no chemical properties?

Which of the following gases in Earth's atmosphere would you expect to find as molecules and which as individual atoms? a. Nitrogen b. Oxygen c. Argon

A substance that does not conduct electricity as a solid but does conduct electricity when melted is most likely classified as (1) an ionic compound (2) a molecular compound (3) a metal (4) a nonmetal

What is done with the reactive sodium after the reaction to make sure the products are safe in an air bag?

Which of the following does not indicate a chemical change? precipitate formation crushing a solid into a powder color change gas evolution

Reactions cannot occur without a certain minimum amount of energy. what is this minimum amount of energy called?