Melting and boiling point of naphthalene

Name this graph.

• Cooling curve of naphthalene

• Heating curve of naphthalene.

What happened at point AB?

• The particles release heat and move slower due to the lost of kinetic energy.

• The particles absorb heat energy and vibrate faster because kinetic energy increases.

What happened at point BC?

• No increase in temperature, because heat energy absorb by particles is used to overcome the attraction forces between the particles.

• The particles absorb heat energy and vibrate faster because kinetic energy increases.

• Temperature decreases, the particles release heat and move slower due to the lost of kinetic energy.

• No decrease in temperature, because heat energy that is lost to the surroundings is balanced by the heat energy released when the particles attract each other to form solid

Name this graph.

• Cooling curve of naphthalene

• Heating curve of naphthalene.

What happened at point FG?

• The particles release heat and move slower due to the lost of kinetic energy.

• The particles absorb heat energy and vibrate faster because kinetic energy increases.

What happened at point FG

• No increase in temperature, because heat energy absorb by particles is used to overcome the attraction forces between the particles.

• The particles absorb heat energy and vibrate faster because kinetic energy increases.

• Temperature decreases, the particles release heat and move slower due to the lost of kinetic energy.

• No decrease in temperature, because heat energy that is lost to the surroundings is balanced by the heat energy released when the particles attract each other to form solid

Substance A melts at -101.0°C and boils at -35.0°C.

Which of the following is the arrangement of particles of substance A?

• 
• 
• 

Substance B melts at 801.0°C and boils at 1413°C.

Which of the following is the arrangement of particles of substance B?

• 
• 
• 

Substance C melts at -94.0°C and boils at 65.0°C.

Which of the following is the arrangement of particles of substance C?

• 
• 
• 

All substances have the same melting and boiling points

• false

• true