Unit 4 Test Review

Front

A substance is solid at room temperature, has a high melting point, and conducts electricity when dissolved in water. What type of bonding is this?

Back

Ionic

Answer explanation

The substance is solid at room temperature, has a high melting point, and conducts electricity when dissolved, indicating ionic bonding. Ionic compounds form crystals and dissociate in water, allowing them to conduct electricity.

Front

A high-viscosity liquid that dissolves in water.

Back

A polar covalent compound.

Answer explanation

A polar covalent compound has a high viscosity due to strong intermolecular forces and dissolves readily in water because of its polarity, allowing it to interact with water molecules effectively.

Front

Type of bond with equal electron sharing?

Back

Nonpolar Covalent

Answer explanation

Non Polar Covalent bonds involve equal sharing of electrons between atoms, resulting in no charge separation. In contrast, Polar Covalent bonds have unequal sharing, while Ionic bonds involve transfer of electrons.

Front

An ionic bond forms when atoms transfer electrons.

Back

transfer

Answer explanation

An ionic bond forms when atoms transfer electrons. This process involves one atom losing electrons and another gaining them, resulting in the formation of charged ions that attract each other.

Front

Covalent Compounds

Back

Share Electrons

Answer explanation

Covalent compounds are formed when atoms share electrons to achieve stability. This sharing of electrons distinguishes them from ionic compounds, which transfer electrons.

Front

A liquid evaporates fast. The liquid has high volatility.

Back

high

Answer explanation

A liquid that evaporates quickly is characterized by high volatility. This means it has a tendency to change from liquid to gas at lower temperatures, indicating a high rate of evaporation.

Front

A liquid flows very slowly. The term that describes this is...

Back

high viscosity

Answer explanation

The term 'high viscosity' describes a liquid that flows very slowly. Viscosity measures a fluid's resistance to flow; high viscosity means greater resistance, resulting in slower movement.

Front

Solids X (melts at 175°C) and Y (melts at 800°C) are heated. This indicates that...

Back

Y has stronger intermolecular forces than X.

Answer explanation

Y has a higher melting point than X, indicating that Y's intermolecular forces are stronger. Stronger forces require more energy to overcome, resulting in a higher melting temperature.

Front

Red polar liquid + yellow nonpolar liquid in a container?

Back

Red layer and yellow layer.

Answer explanation

The red polar liquid and yellow nonpolar liquid do not mix due to their differing polarities. This results in a distinct separation, forming a red layer on top of a yellow layer, rather than a uniform mixture.

Front

Wax is a non-polar solid. Hexane is a non-polar liquid. Will wax dissolve in hexane?

Back

YES, because they are both non-polar.

Answer explanation

Wax and hexane are both nonpolar substances. Nonpolar substances tend to dissolve in each other due to similar intermolecular forces. Therefore, wax will dissolve in hexane.