The diagram shows Niels Bohr's model of an atom.

What happens when the electron moves from the first energy level to the second energy level?

How to distinguish a solution of sodium sulphite from a solution of sodium sulphate in the lab

Which of these is an example of a physical change? A) sugar dissolving in warm water B) iron rusting in the presence of moist air C) wood burning in the prescence of oxygen D) baking soda reacting with acid to form a gas

What are some or the characteristics of Wisconsin fast plants and zebra fish that make them ideal for use as model organisms?

What does not change when a solution is diluted?

The creation of carbon monoxide is an effect. what is one cause?

Is the water density higher than the aluminum density

How many moles of molecular oxygen (o2) are consumed in the complete combustion of one mole of pentane (c5h12) ?

A gas has a volume of 30 L at 105 kPa. What pressure is required to compress the gas to 21 L?

Using special equipment which layer of the sun atmosphere is visible during a total solar eclipse

The characteristic flame test colors of metal ions are due to atomic emission spectra. Duscuss the relationship between the absoption and emission of light and the factors responsible for flame test colors.