• Na⁺(g) and Cl^-(g)
• Cs⁺(g) and Br^-(g)
• Mg²⁺(g) and O^2-(g)
• Mg²⁺(g) and O^2-(g)

Which of the following diagrams best depicts an alloy of Ni and B?

• A
• B
• C
• D

Tags

NGSS.HS-PS1-3

• Polar covalent bond
• Nonpolar covalent bond
• Hydrogen bond
• London dispersion forces

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-4

• C₄H₁₀, because it has more H atoms, resulting in more H-bonding
• C₄H₁₀, because it has more electrons, resulting in greater polarizability and stronger LDFs
• C₂H₆, because its molecules are smaller and they can get closer to each other, resulting in stronger LDFs
• C₂H₆, because its molecules are more polar, resulting in stronger dipole-dipole attractions

• B, because it has five core electrons
• B, because it has three valence electrons
• N, because it has five valence electrons
• N, because it has three electrons in the p sublevel

• Benzene is nonpolar, so there are no forces between water and benzene.
• The H atoms in benzene form H-bonds with the O atoms in water.
• Benzene is hydrophobic, so there is a net repulsion between water and benzene.
• There are dipole-induced dipole and LDF interactions between water and benzene.

When the following reaction occurs, does the hybridization of the carbon atoms change?
C₂H₂(g) + Cl₂(g) −> C₂H₂Cl₂(g)

• Yes; it changes from sp to sp²
• Yes; it changes from sp to sp³
• Yes; it changes from sp² to sp³
• No; it does not change

• X has a larger molar mass than Y does.
• Y has a larger molar mass than X does.
• X is more polar than Y.
• Y is more polar than X.

• C₆H₁₂O₆(s)
• NaOH(s)
• SiO₂(s)
• Cu(s)

Which of the following correctly identifies which has the higher first-ionization energy, Cl or Ar, and supplies the best justification?

• Cl, because of its higher electronegativity

• Cl, because of its higher electron affinity

• Ar, because of its completely filled valence shell

• Ar, because of its higher effective nuclear charge