There are three isotopes of silicon. They have mass numbers of 28, 29 and 30. The average atomic mass of silicon is 28.086amu. What does this say about the relative abundances of the three isotopes?

What do lines in an elements line spectrum represent?

Seleccione una actividad humana y el impacto generado debe realizar un resumen sobre la actividad seleccionada y dos medidas de prevención para evitar la alteración de los ciclos.

Complete and balance the molecular equation for the reaction of aqueous sodium carbonate, Na 2 CO 3, and aqueous nickel (II) chloride, NiCl 2. Include physical states.

An engineer is trying to create a fast reaction in a fuel mixture. Which should she do? A. Decrease the amount of fuel B. Lower the temperature of the engine C. Add a catalyst to the fuel mixture D. Lower k for the fuel reaction

Which sublevels are full when an atom has a noble gas configuration?

Assuming that air contains 78 percent N2, 21 percent O2 and 1 percent Ar, all by volume. How many molecules of each type of gas are present in 1.0 L of air at STP?

Two children are playing tag. Child A who is doing the chasing can run 100m in 24 seconds Child B is running away from child A and can run 64m in 21 seconds.

What ion does a base increase

What is the definition of Amplitude?

An excess of NiCO3, 12 g, was added to 40cm cube of sulpheric acid, 2.0 mol/dm cube. The unreacted nickel carbonate was filtered out and the filtrate evaporated to optain the crystals.