Bonding and Moles (Friday)

What is the number of electrons shared between the atoms in a molecule of nitrogen, N₂?

8

• 8

• 2

• 3

• 6

Which element has metallic bonds at room temperature?

• bromine

• cesium

• krypton

• sulfur

Which statement classifies the two compounds?

• Both compounds are ionic.

• Both compounds are molecular.

• Compound 1 is ionic, and compound 2 is molecular.

• Compound 1 is molecular, and compound 2 is ionic.

Which Lewis electron-dot diagram represents the bonding in potassium iodide?

• 
• 
• 
• 

What occurs when potassium reacts with chlorine to form potassium chloride?

• Electrons are shared and the bonding is ionic.

• Electrons are shared and the bonding is covalent.

• Electrons are transferred and the bonding is ionic.

• Electrons are transferred and the bonding is covalent.

Which equation represents a conservation of atoms?

• 2Fe + 2O₂ → Fe₂O₃

• 2Fe + 3O₂ → Fe₂O₃

• 4Fe + 2O₂ → 2Fe₂O₃

• 4Fe + 3O₂ → 2Fe₂O₃

What is the percent composition by mass of nitrogen in the compound N₂H₄ (gram-formula mass = 32 g/mol)?

• 13%

• 44%

• 88%

• 93%

Given the equation representing a chemical reaction: NaCl(aq) + AgNO₃(aq) → NaNO₃(aq) + AgCl(s)

This reaction is classified as a

• synthesis reaction

• decomposition reaction

• single replacement reaction

• double replacement reaction