11th grade Chem. Assessment

What is the primary difference between ionic and covalent bonding?

• Ionic bonding involves the sharing of electrons, while covalent bonding involves the transfer of electrons.
• Ionic bonding involves the transfer of electrons, while covalent bonding involves the sharing of electrons.
• Ionic bonding only occurs between metals, while covalent bonding only occurs between non-metals.
• Ionic bonding results in the formation of molecules, while covalent bonding results in the formation of crystals.

Which of the following correctly describes a Lewis structure?

• A Lewis structure shows the arrangement of atoms in a molecule and the sharing of electron pairs between atoms.
• A Lewis structure represents the ionic charge of an atom.
• A Lewis structure indicates the temperature at which a substance melts.
• A Lewis structure provides the molecular weight of a compound.

In stoichiometry, what is the mole concept used for?

• To determine the color of a chemical compound.
• To predict the odor of a reaction product.
• To calculate the quantity of reactants and products in a chemical reaction.
• To measure the volume of a gas produced during a reaction.

Which type of reaction is represented by the chemical equation 2H₂ + O₂ -> 2H₂O?

• Synthesis reaction
• Decomposition reaction
• Single displacement reaction
• Double displacement reaction

What is the main purpose of balancing a chemical equation?

• To ensure equal concentrations of reactants and products.
• To satisfy the law of conservation of mass.
• To speed up the reaction rate.
• To increase the yield of the reaction.

What is the molecular shape of a molecule with a central atom and four surrounding atoms in a tetrahedral arrangement?

• Trigonal planar
• Octahedral
• Trigonal bipyramidal
• Tetrahedral

Which of the following is an example of a double displacement reaction?

• 2Na (s) + Cl₂ (g) -> 2NaCl (s)
• HCl (aq) + NaOH (aq) -> NaCl (aq) + H₂O (l)
• 2Mg (s) + O₂ (g) -> 2MgO (s)
• BaCl₂ (aq) + Na₂SO₄ (aq) -> BaSO₄ (s) + 2NaCl (aq)

How many moles of NH₃ are produced when 4 moles of N₂ react with H₂ according to the following balanced equation: N₂ + 3H₂ -> 2NH₃?

• 2 moles
• 6 moles
• 4 moles
• 8 moles

Which of the following types of bonds is typically formed between a metal and a non-metal?

• Ionic bond
• Covalent bond
• Metallic bond
• Polar covalent bond

What is the molecular shape of a molecule with a central atom and two surrounding atoms in a linear arrangement?

• Trigonal pyramidal
• Bent
• Linear
• Trigonal planar