What is the name of an element that have a atomic number of 82 and the atomic number of 207

If you have 10 grams of a substance Tha. t decays with a half-life of 14 days, then how much will you have after 42 days? 3.13g 6.25g 1.25g 2.50g

In some aquatic ecosystems, nitrate (NO3-) is converted to nitrite (NO2-), which then decomposes to nitrogen and water.

Which of these accurately describes a chemical reaction? A. Products and reactants combine to form new substances. B. Products combined to form reactants C. Reactants combine to form products D. Products and reactants combine to form new reactants.

The hydrogen ion concentration of a vinegar solution is 0.00010 m. how is this concentration written in scientific notation?

An FM radio station has a wavelength of 2.813 m. Convert this length to feet.

A mixture of He He, N 2 N2, and Ar Ar has a pressure of 22.1 22.1 atm at 28.0 28.0 °C. If the partial pressure of He He is 2475 2475 torr and that of Ar Ar is 1049 1049 mm Hg, what is the partial pressure of N 2 N2?

Oceans make the temperaturs of nearby land more extreme ... True or false

The Greek letter D stands for A. Mass of B. Rate of C. Change in D. Heat stored in

14. Two or more substances that are together but do not combine to form a new, pure substance.

A solution of a compound with a known extinction coefficient of 23,100 M-1cm-1 has an absorbance of 0.735 in a 1.30cm path length, what is the concentration of the solution