Within the main group elements, a family on the periodic table has the same number of electrons on in the valence level. TRue or false

Suppose the half-life of an isotope is 10 years. After how many years will half of this isotope have decayed into its daughter elements? 5 Years 10 years 20 years

In a 1.0 * 10-6 M solution of Ba (OH) 2 (aq) at 25 °C, identify the relative molar amounts of these species.

You have 25 cm^3 of a gas at 25 C and 103.86 kappa. What is the new volume at STP?

Given a fixed amount of gas held at constant pressure, calculate the volume (in L) it would occupy if a 3.50 L sample were cooled from 90.0oC to 30.0oC.

Suppose you use 0.0150 liter of a 2.50 M solution of silver nitrate. Assuming the reaction goes completion how much silver sulfide is produced

Which phrase is the best description of weathering? A-Compacting Rocks B-Cementing Rocks Together C-Crystallizing to form minerals D-Breaking Rocks into fragments by physical or chemical means

Calculate the acid dissociation constant of a weak monoprotic acid if a 0.5M solution of this acid gives a hydrogen-ion concentration of 0.000 1M? Show your work.

Which orbital notation represents a noble gas in the ground state

c. When we heat water up by the Bunsen burner, what temperature is the boiling water? After 10 minutes

Assuming that air contains 78 percent N2, 21 percent O2 and 1 percent Ar, all by volume. How many molecules of each type of gas are present in 1.0 L of air at STP?