Diagnostic Test

Q: In chemical compound, covalent bond forms when?

• the electronegativity difference between two atoms is very large.

• electrons are completely transferred between two metals.

• pairs of electrons are shared between two nonmetals atoms.

• two nonmetal atoms are attracted to each other by opposite charges.

Q: The atomic number of an element tells you what about the element?

• number of ions

• number of valence electrons

• number of electrons

• number of protons

Q: Balance the following reactions:

Mg(s) + HCl(aq) --> MgCl₂(aq) + H₂(g)

• 1, 2, 1, 2

• 2, 1, 1, 2

• 1, 2, 2, 2

• 1, 2, 1, 1

Q: Using the balance equation in the previous question,

MgCl(s) + HCl (aq) --> MgCl₂(aq) + H₂(g)

How many grams of HCl are consumed by the reaction of 2.50 moles of magnesium?

• 5.00 g

• 7.29 g

• 218 g

• 182 g

Q: Using the balanced equation from the previous equation,

MgCl(s) + HCl(aq) --> MgCl₂(aq) + H₂(g)

How many moles of HCl are consumed in the production of 7.5 moles of MgCl₂?

• 15 moles

• 3.8 moles

• 7.5 moles

• 23 moles

Q: Dipole-dipole attractions occur between polar molecules. Which of these molecules is polar?

• H₂

• CH₄

• HCl

• BH₄

Q: Lewis structure for acetone is shown below. What type of intermolecular forces will be present between the molecules of acetone in a pure sample of acetone? Select all that apply.

• ion-dipole interactions

• dipole-dipole interactions

• hydrogen bonding

• London forces

Q: Which numbered arrow in the image above points to a hydrogen bond?

• 1

• 2

• 3

• 4

Q: How do the following elements bond together? Al⁺³ and O²⁻

What is the name of the compound formed?

• Al₃O₂,

  Aluminum oxide

• Al₃O₂,

  Trialuminum dioxide

• Al₂O₃,

  Aluminum oxide

• Al₂O₃,

  Trialuminum dioxide

Q: Ionic Bonding involves:

• transfer of protons

• transfer of electrons

• transfer of neutrons

• sharing electrons