Assume that a hydrogen atom's electron has been excited to the n? 5 level. how many different wavelengths of light can be emitted as this excited atom loses energy?

What does a graph with no trend indicate about the variables?

Identify the true statements about colloids. a.) Emulsions are a type of colloid b.) The particals of a colloid are larger than the particles of a solution c.) The particles of a colloid will settle over time d.

Type the correct answer in the box. Express your answer to three significant figures. This balanced equation shows the reaction of sodium hydroxide and sulfuric acid: 2NaOH + H2SO4 → Na2SO4 + 2H2O.

A librarian is interested in the numbers of books that visitors check out from the library. She examines the checkout records of 250 randomly selected adult visitors. Identify the population and sample for this situation.

Explain in terms of collision theory, how and why a reactions's rate changes as the reaction progresses

A very small equilibrium constant means ... a. an equal amount of reactants and products c. more products b. more reactants d. system isn't at equilibrium

What is in a banana? give me specifics?!

When 17.28 mL of a 0.078 M aqueous solution of Na2SO4 is combined with 11.30 mL of a 0.20 M aqueous solution of NaCl and 7.84 mL of a 0.26 M aqueous solution of KCl, what is the total concentration of Na + in the combined solution?

What mass of carbon can 3000 J of energy raise from 12°C to 40°C?

How do you balance __Mg + __HCl - - > __MgCl2 + ___ H2