A particular radioactive isotope has a half-life of (2.50+a) hours. if you have (24.5+b) g of the isotope at 10:00 am, how much will you have at 7:30pm? give your answer in grams (g) and with 3 significant figures.

What is the name of the scientist who discovered the electron? a. Niels Bohr b. John Dalton c. J. J. Thompson d. Robert Millikan

Which types of elements combine to form ionic compounds

What is the volume of 3.50 moles of oxygen gas (O2) at 273 K and 1.00 atm?

Which element shares the most characteristics with carbon (C) ?

All of the following are abiotic factors in an ecosystem except? A) minerals B) soil C) Plants D) temperature

Which oxygen pachages materials and distributed them throughout the cell

How many atoms in 3 mol zn

Isotopes: are atoms of different elements which have the same mass are atoms of the same element with equal numbers of neutrons are atoms of the same element with different numbers of neutrons are atoms of the same element with equal numbers of

What would happen to the volume of a sample of gas if the temperature was decreased at the same time the pressure was increased?

How do the compounds that cause acid rain spread from their source?