Which of the following liquids experiences dipole-dipole intermolecular forces?

• H₂ (l)
• CF₄ (l)
• SO₂ (l)
• CCl₄ (l)

Which of the following best explains why temperature increases cause reaction rates to increase. 

• As temperature increases, activation energy increases
• As temperature increases, activation energy decreases
• As temperature increases, collisions between reactant particles increases
• As temperature increases, more collisions between particles have a required amount of energy.  

A sample of a solid substance does not conduct electricity in either the solid or liquid phase.  The solid is soluble in water.  Which of the following types of interactions is most likely found between particles in the pure substance?

• ionic bonds
• metallic bonds       
• network covalent bonds
• dipole-dipole forces

Tags

NGSS.HS-PS1-3

Gaseous ammonia was synthesized in the presence of a catalyst and allowed to reach equilibrium.  Which of the following changes would cause more ammonia to be present in the mixture when equilibrium is reestablished?

• decrease the temperature
• increase the container’s volume
• add a chemical that reacts with hydrogen gas
• remove nitrogen gas from the container

Which of the following shows the molecules F₂, Cl₂, and Br₂ in order of their bond enthalpies from least to greatest?

• F₂ < Cl₂ < Br₂
• Cl₂ < Br₂ < F₂
• Br₂ < Cl₂ < F₂
• Br₂ < F₂ < Cl₂

Based on Coulomb’s Law and the data in the table above, which of the following would have the weakest interactions with an adjacent water molecule in an aqueous solution? 

• Hg²⁺
• Ba²⁺
• Mg²⁺
• Al³⁺

Tags

NGSS.HS-PS1-3

NGSS.HS-PS2-4

A student performs an acid base titration.  The data are plotted above.  Which of the following best describes the type of titration done?

• a strong acid was titrated with a strong base
• a weak acid was titrated with a weak base
• a weak acid was titrated with a strong base
• a strong acid was titrated with a weak base

A sample of a compound contains 18.0 g C, 2.0 g H, and 8.0 g O.  Which of the following is the empirical formula of the compound? 

• C₂H₂O
• C₆H₈O₂
• C₃H₄O
• C₃H₄O₂

The K_sp values of several salts are shown in the table above.  A saturated solution of which of the following compounds has the highest Br^- concentration?

• PbBr₂
• CuBr
• AgBr
• HgBr₂

What is the standard reduction potential for the lead (II) half reaction?

• -3.13 V
• -0.13 V
• +0.13 V
• +3.13 V