Water Test

Match the following words and definitions.

• having areas of opposite charge

• hydrophobic

• a molecular cluster composed of a hydrophobic interior and a hydrophilic surface

• hydrophilic

• water molecules surrounding an ion in solution

• hydration sphere

• water loving

• micelle

• water fearing

• polar

What type of bond holds a water molecule together?

• Covalent

• Ionic

• Dipole-Dipole

• Metallic

Why do electrons in a water molecule spend a greater amount of time near the oxygen nucleus?

• Because water is ionic.

• Because water is covalent.

• Because hydrogen has 1 proton.

• Because oxygen has 8 protons.

What does it mean when a molecule is "polar"?

• The molecule is a solid.

• The temperature of the molecular solution is cold.

• There is an uneven distribution of electron charge in the molecule.

• Hydration spheres have been formed by the molecule.

Why is water known as the universal solvent?

• Because of water's ability to dissolve many substances.

• Because the water has covalent bonds.

• Because the water molecules are cohesive.

• Because water forms hydration spheres around ions in solution.

Match the following words with their definitions.

• dissimilar molecules stick together

• heterogeneous

• a mixture that macroscopically does not appear the same throughout

• homogeneous

• a homogeneous mixture

• cohesive

• like molecules stick together

• adhesive

• a mixture that macroscopically appears the same throughout

• solution

What is a hydrogen bond?

• When a hydrogen atom is bonded to an oxygen atom in a water molecule.

• When a negative oxygen from one molecule is attracted to a positive hydrogen from another molecule.

• When hydrogen is covalently bonded to another atom.

• When hydrogen is bonded to another hydrogen.

Draw a water molecule attracted to a chlorine ion with as much detail and labelling as possible.

Explain how water dissolves salt.

A ​ (a)   is composed of a ​ (b)   which is dissolved into a ​ (c)   .

• solution
• solute
• solvent