AP Chemistry - Kahoot Questions Chapter 4

What is Beer's Law?

A = εbc

A=Ɛbc, what is b?

path length or cell width

What mass of NH₄Cl is needed to prepare 500.0 mL of a 0.187 M solution.

5.00 g

How much concentrated 12M hydrochloric acid is needed to prepare 100. mL of a 2.0 M solution?

17 mL

What is the pOH of a solution in which [H₃O⁺] = 2.6 x 10^-6 M?

8.41

In a Beer's law graph, what does the slope of the linear relationship equal if b = 1.0 cm?

molar absorptivity

What is the M of 100 mL of NaOH sol'n if it takes 20.0 mL of 2.5 M H₃PO₄ to neutralize it?

1.5M

What is a limiting reactant?

reactant that determines the amount of product formed

How do you calculate percent yield?

experimental yield/theoretical yield x 100

The theoretical yield of a chemical reaction is

the max. amount of product formed ideally

Actual yield must be determined by:

experimentation

What is the molarity of 2 mol solute dissolved in 500 mL solvent?

4 M

To prepare a solution with specific molarity, which container should be used to fill and mix to the final volume?

volumetric flask

Which term describes a stepwise dilution of a substance in solution?

Serial dilution

The [H₃O⁺] in a solution with pH 2.36.

4.4 X 10^-3 M

The pH of a solution at 25°C in which [OH^-] = 3.9 X 10^-5 M is:

9.59

What is the Acid-Base titration equation?

#H⁺ x M_A x V_A = M_B x V_B x #OH^-

The point during a titration where the indicator's color change is noticed.

end point

The equivalence point is:

When stoichiometric amounts of acid and base have reacted

The equivalence point is where.....

moles acid = moles base

Optimum wavelength to use for spectrophotometry here?

400 nm

Beer's Law says

the absorbance of a colored solution is related to its concentration