Heating and Cooling Curve of Matter

The temperature at which the liquid and gas phases of matter can exist at the same time is called its

• boiling point
• melting point
• kinetic molecular theory
• freezing point

The Heating Curve of an unknown substance is shown below. What is the boiling point of the substance?

• 120 decrees C
• 60 degrees C
• 140 degrees C
• 40 degrees C

The picture of how atoms are arranged in the below substance represents a ______________________ solid.

• Cyrstalline
• Amorphous
• Singular
• Perfect

Using the picture below, what is the main reason that explains why the paper clip can float on the liquid?

• Surface Tension
• Density
• Viscosity
• Fluidity

The Heating Curve of an unknown substance is shown below. What is the melting point of the substance?

• 60 degrees C
• 120 degrees C
• 140 degrees C
• 40 degrees C

After heating sodium metal for 19 minutes, which phase of matter is present?

• Liquid and Gas
• Solid
• Solid and Gas
• Gas
• Liquid

What phase of matter is present at 45 degrees C?

• Liquid and Gas
• Solid
• Solid and Gas
• Gas
• Liquid

Which substance will have the GREATEST viscosity?

• Honey (Cold)
• Water (50 degrees C)
• Vegetable Oil (Hot)
• Vinegar (Room Temperature - 21 degrees C)

This curve indicates what about the heat energy?

• heat energy is being added or absorbed
• heat energy is being removed

NaCl(s) was heated up starting at an initial temperature of 0°C. The heating curve is shown in the picture. What is the melting point of this substance?

• 0°C

• 801°C

• 1000°C

• 1465°C