If 1/8 of an original sample of krypton-74 remains unchanged after 34.5 minutes, what is the half life of krypton-74?

Why do u see only one side of the moon from earth? a. the moon does not rotate b. the moon takes longer to rotate than to revolve around earth c. the moon takes less time to rotate than to revolve around earth d.

Both ti and hf behave as though they possess the same number of valence electrons. Which of the subshells in the electron configuration of hf behave as valence orbitals?

An ideal blackbody is an object that 1 - absorbs all the energy that strikes it. 2 - absorbs most of the energy that strikes it. 3 - only absorbs energy at ultraviolet (black light) wavelengths. 4 - absorbs a little of the energy that strikes it.

For a neutral Nitrogen, how many electrons are in the 2p electron orbitals?

What is the formula for hyposulfurous acid?

Assuming constant pressure, rank these reactions from most energy released by the system to most energy absorbed by the system, based on the following descriptions: A. Surroundings get colder and the system decreases in volume. B.

Zircon is a mineral with the empirical formula ZrSiO4. If all the zirconium is 90Zr, all the silicon is 28Si, and all the oxygen is 16O, what mass of oxygen is present in 10. g of zircon?

Which property below is not a general property of metals: A. Ductile C. Malleable B. Poor conductor of heat D. High luster

Calculate the number of particles (atoms or molecules) of the following: 1. How many molecules are there in 24 grams of FeF3? 2. How many molecules are there in 450 grams of Na2SO4? 3. How many grams are there in 2.3 x 1024 atoms of silver?

Write a balanced equation for the decomposition reaction described, using the smallest possible integer coefficients. When calcium carbonate decomposes, calcium oxide and carbon dioxide are formed.