An electron is traveling at 1.500 × 105 m/s. what is its speed in light years per century? (useful conversion factors: 1 light-year ≡ 9.460730472580800 × 1015 m)

In which block of the periodic table is uranium (u) found? s blockd blockp blockf block

What is a substance? a. a physical property of matter b. a chemical property of matter c. an element or compound that cannot be physically separated d. characteristics used to tell the difference between mixtures

Calculate the molarity of each aqueous solution: a. 78.0 ml of 0.240 m naoh diluted to 0.250 l with water b. 38.5 ml of 1.2 m hno3 diluted to 0.130 l with water