Heating and Cooling Curves

In which region(s) of the graph does a phase change occur?

• Region 1, 3, & 5
• Region 2 & 4
• Region 1 only
• Region 1 & 2

Tags

NGSS.MS-PS1-4

Describe the substance between letters C and D. 

• Gas
• Liquid
• Melting
• Evaporating

Tags

NGSS.MS-PS1-4

What is holding molecules in a solid close to each other?

• Intermolecular forces

• Chemical Bonds

• Heat

• Cold

Tags

NGSS.HS-PS1-3

As matter cools what happens to the intermolecular forces?

• they strengthen

• they weaken

• they reverse

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

What is true about intermolecular forces in gases

• they have been broken by heat

• They are very strong

• They cannot be put back together

• they represent a chemical change

Tags

NGSS.MS-PS1-4

The freezing and melting points of water are the same.

• True
• False

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

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

Tags

NGSS.MS-PS1-4

Given the heating curve of a solid being heated at a constant rate, what is the boiling point of this substance?

• 20°C

• 50°C

• 110°C

• 170°C

Tags

NGSS.MS-PS1-4

Given the heating curve of water, what is happening to potential and kinetic energy during segment CD?

• the potential energy and kinetic energy both increase

• the potential energy increases while the kinetic energy decreases

• the potential energy is constant while the kinetic energy increases

• the potential energy increases while the kinetic energy is constant

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-5

Given the heating curve of a solid being heated at a constant rate, how much total time was required to boil this substance after it reached its melting point?

• 3 minutes

• 4 minutes

• 10 minutes

• 14 minutes

Tags

NGSS.MS-PS1-4