1.) How many photons are produced in a laser pulse of 0.643 J at 575 nm? 2.)A certain rifle bullet has a mass of 5.01 g. Calculate the de Broglie wavelength of the bullet traveling at 1649 miles per hour. Consult the table of physical constants as needed.
3.) What element forms an ion with an electronic configuration of [Ne] and a −2 charge?

There are main groups in the modern periodic table of elements

Ase your answer to this question on the information below.hydrocarbons and fissionable nuclei are among the sources used for the production of energy in the united states. a chemical reaction produces much less energy than a nuclear reaction per mole of reactant.the balanced chemical equation below represents the reaction of one molecule of a hydrocarbon with two molecules of oxygen.chemical equation: ch4 + 2o2 → co2 + 2h2o + 1.48 × 10−18 jthe nuclear equation below represents one of the many possible reactions for one fissionable nucleus. in this equation, x represents a missing product.nuclear equation: write an isotopic notation for the missing product represented by x in the nuclear equation.

Fossil fuels are organic compounds that are made from