Key Concepts in AP Chemistry: Mass Spectrometry and Periodic Trends

What does mass spectrometry primarily tell us about an element?

• The solubility in water

• The boiling point of the element

• The number of isotopes and average atomic mass

• The color of the element

Which part of mass spectrometry is not tested?

• Mass spectrum of a mixture of elements

• Identification of isotopes

• Calculation of average atomic mass

• Mass spectrum of individual elements

What is the empirical formula?

• The formula with the highest number of atoms

• The formula showing the exact arrangement of atoms

• The simplest whole number ratio of atoms in a compound

• The formula showing isotopes of elements

How can the purity of a substance be tested?

• Through precipitation reactions

• By measuring its volume

• By changing its color

• By freezing the substance

What does Coulomb's law help to explain in periodic trends?

• The solubility trends in the periodic table

• The melting points of elements

• The attraction between protons and electrons

• The color changes in elements

How does atomic radius change as you move across a period?

• It decreases

• It remains constant

• It fluctuates unpredictably

• It increases

What is the trend in ionization energy as you move down a group?

• It increases

• It decreases

• It remains constant

• It fluctuates unpredictably

What should you emphasize when explaining periodic trends?

• Color changes

• Effective nuclear charge

• Boiling points

• Solubility in water

For ions, from which energy level do electrons get removed first?

• The lowest energy level

• The highest filled energy level

• The middle energy level

• Randomly from any energy level

Why is it incorrect to say an element wants to be stable in free response questions?

• Because elements do not have desires

• Because stability is not related to periodic trends

• Because it's too general and lacks scientific terminology

• Because all elements are already stable