If 50% of radioactive element remains after 4000 years what what is the half life

Consider the molecules CF4 and SF4

During local winds which way does the cooler wind blow at night

Using the periodic table, complete the following. Element: iron symbol: Fe Atomic weight: g Mass of one mole: g/mol

Balance the equation MnO2 + HCl → Cl2 + MnCl2 + H2O using the smallest possible integer coefficients. What is the sum of the coefficient?

22) The molar mass of sucrose is measured to be 342.3 g. The value of Avogadro's number, correct to six significant digits, is 6.022 14 x 1023. The number of molecules in 0.

Hf is a stronger acid than nh + 4. which base would be stronger: f - or nh3? 1. f - 2. both bases would be equal in strength. 3. nh3 4. cannot tell from the information given. 5. neither f1 - nor nh3 would be bases.

The concentration of commercially available concentrated nitric acid is 70.0 percent by mass, or 15.9 M. Calculate the density and molality of the solution.

Whats 2 properties of iron?

Which light packs the highest energy per photon

Which of the following hydrocarbons will most likely be found around cows?