americium-241 has a half-life of 430 years. how much of a 10.0g sample of americium-241 remains after 1720 years?

Compare and contrast the functions of each of the following types of flasks: filter, Erlenmeyer, volumetric.

Janice mixed an orange solution of sodium sulfide with a clear solution of hydrochloric acid. She noticed after a minute that the solution smelled something like rotten eggs. What could she reasonably infer from the odor released by the solution? A.

Which of the following elements would you expect to be extremely explosive in the presence of water? A. sodium B. neon C. oxygen D. sulfur

The best place to build a wind farm is in an area that has high winds for a portion of the year. True False

If a carbon atom is bonded to two hydrogen atoms and two carbon atoms, what type of bond must exist between the carbon atoms single double triple quadruple

We are all familiar with the general principles of operation of an internal combustion engine: the combustion of fuel drives out the piston.

A first order reaction has a rate constant of 0.816 at 25 oC. Given that the activation energy is 22.7 kJ/mol, calculate the rate constant at 34 oC. (enter answer to 3 decimal places)

Part b select the ester that is formed when propanoic acid reacts with isopropyl alcohol in the presence of heat and an acid catalyst.

Do metals form anions or cations

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