A beta particle may be spontaneously emitted from

(1) a ground-state electron

(2) a stable nucleus

(3) an excited electron

(4) an unstable nucleus

A student asks you for a simple rule to tell apart plants cells and animal cells when viewed under a microscope. Describe such a rule.

How many molecules are there in 0.50 moles chlorine?

Which of the following is the greatest speed: 20 m/s, 200 cm/s, or 0.2 km / s

Which statement best explains the role of a catalyst in a chemical reaction? (1) A catalyst is added as an additional reactant and is consumed but not regenerated. (2) A catalyst limits the amount of reactants used.

A piece of sodium metal when thrown in water catches fire. give reason

discuss the origin of the line citing the bohr theory of the atom specify any energy transitions that are applicable

What does the chemical formula of an ionic compound represent?

The wavelength of some yellow light is 580.0 nm. What is the frequency of this yellow light?

A sample of chlorine gas contracts from 550 mL to 376 mL when it is cooled from 63 °C to 12 °C. If the initial pressure of the chlorine was 725 torr, what is the final pressure of the chlorine?

The skin and lungs get rid of this waste? What does it het rid of?