STM3305 Chemical Part 2

What determines whether a molecule is polar or nonpolar?

• The number of bonds in the molecule

• The symmetry of the molecule

• The type of atoms in the molecule

• The temperature of the molecule

Which of the following materials is nonpolar?

• PVC

• PE

• Glass

• Metal

What happens to the intermolecular forces in packaging materials when exposed to high temperature and shear?

• They become stronger

• They become weaker

• They remain the same

• They become unpredictable

Which type of chemical bond is found in an ionomer?

• Covalent bonds only

• Ionic bonds only

• Metallic bonds only

• Both covalent and ionic bonds

Which type of bond is the strongest?

• Covalent bond

• Metallic bond

• Ionic bond

• Dispersion force

What are intermolecular forces also known as?

• Primary bonds

• Secondary bonds

• Van der Waals forces

• Dipole-dipole interactions

Which type of intermolecular force is the weakest?

• Dispersion force

• Dipole-dipole force

• Ion-dipole force

• Hydrogen bonding

What type of molecules do dipole-dipole forces act between?

• Nonpolar molecules

• Polar molecules

• Charged ions and polar molecules

• Hydrogen-bonded molecules

What is responsible for the dissolution of ionic substances in polar solvents?

• Dispersion forces

• Dipole-dipole forces

• Ion-dipole forces

• Hydrogen bonding

Which type of intermolecular force is responsible for water properties?

• Dispersion force

• Dipole-dipole force

• Ion-dipole force

• Hydrogen bonding