The Mole and Chemical Bonding

What is the value of Avogadro's constant?

• 9.81 × 10²³
• 3.14 × 10⁸
• 1.6 × 10⁻¹⁹
• 6.022 × 10²³

The mass of one mole of a substance in grams is its ____.

• atomic number
• density
• molar mass
• valency

What is the molar mass of water (H₂O)?

• 18 g/mol
• 16 g/mol
• 34 g/mol
• 2 g/mol

____ bonding transfers electrons from a metal to a non-metal.

• Metallic
• Covalent
• Hydrogen
• Ionic

What type of bonding is in methane (CH₄)?

• Metallic
• Covalent
• Ionic
• Nuclear

Metallic bonding explains why metals conduct electricity.

• True
• False

What is the bond angle in methane?

• 180°
• 109.5°
• 104.5°
• 90°

Water is bent with a bond angle of about 104.5° due to lone pairs.

• True
• False

The reactant that runs out first is the ____ reagent.

• excess
• limiting
• product
• catalyst

In 2H₂ + O₂ → 2H₂O, moles of O₂ per 2 H₂?

• 2
• 3
• 4
• 1

Percentage yield equals (theoretical ÷ actual) × 100.

• True
• False

One mole of gas at RTP occupies about how much?

• 12 dm³
• 6 dm³
• 24 dm³
• 48 dm³

Equal volumes of gases at same T and P have equal ____ of molecules.

• masses
• densities
• numbers
• charges

For solutions, moles equal concentration multiplied by volume.

• True
• False

What mass does one mole of carbon-12 atoms have?

• 12 grams
• 24 grams
• 6 grams
• 1 gram