A radioactive element is half disintegrated in 40 minutes. What is the time required for the decay of 75% of the element

Calculate the mass percent of calcium in Ca (OH) 2?

P3S6 ionic or molecular?

What is meant by the average atomic mass of an element?

If you add 4.00 mL of pure water to 6.00 mL of 0.750 M NaCl solution, what is the concentration of sodium chloride in the diluted solution? A) 0.250 MM B) 1.13 M C) 0.500 M D) 0.450 M E) none of the above

Give 3examples of an element, define

How are the physical and chemical properties of atoms represented on the periodic table of elements

how do we know isotopes exist?

Is albinism a dominant or recessive trait

If T = dominant, and t = recessive, what would the genotypes be?

What problem would unlimited cell growth pose for a cell