FREE AP Chemistry Exam Question and Answers

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What happens to the equilibrium constant when ΔT increases, and why?

Correct! Wrong!

Explanation:
Due to the exothermic nature of this reaction, heat is produced as a byproduct. Thus, as the temperature rises, the equilibrium statement shifts to the left, with the numerator falling and the denominator rising. The entire value of K is lowered as a result.

The gases in the container would vary from ideal conditions the greatest under which of the following circumstances, and why?

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Explanation:
The insignificant intermolecular interactions between the gas molecules are one of the presumptions of a kinetic molecular theory. The IMFs between the molecules are more likely to lead to deviations from optimal behavior if they are moving very slowly.

A neutral atom of chlorine has a first ionization energy of 1.25 MJ/mol, while a neutral atom of argon has a first ionization energy of 1.52 MJ/mol. How would those numbers compare to the first ionization energy of a neutral potassium atom?

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Explanation:
While chlorine and argon's first valence electrons are both in the third energy level, potassium's first valence electron is in the fourth.

What, if any, effects may an increase in sodium hydroxide concentration have on the graph if done before repeating the titration?

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Explanation:
A lesser volume of NaOH would be required to add enough moles to achieve the equivalence point because a more concentrated NaOH solution allows for the addition of more moles per drop.

To produce 127 g of copper, how many moles of electrons must be transferred?

Correct! Wrong!

Explanation:
The balanced equation shows that 127 g is equal to 2 moles of copper. One mole of electrons are needed to convert one mole of copper from +1 to -0. The production of twice as many moles necessitates twice as many electrons.

Which of the following is supported by a review of mass spectrometry data?

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Explanation:
The masses of each atom of an element are found via mass spectrometry. It has been established by mass spectrometry that every element has many potential masses.

The electronegativity of nitrogen is comparable to that of phosphorus and oxygen. Which of the following best sums up how the three values relate to one another?

Correct! Wrong!

Explanation:
Due to its smaller size and greater ability to draw more electrons than phosphorus, which has three electron shells, nitrogen has a stronger electronegativity. Both nitrogen and oxygen contain two shells, however, oxygen has more protons and a greater effective nuclear charge than nitrogen (+6 vs. +5). The electronegativity of oxygen is increased as a result.

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