Heating Curve

The heating curve for a sample of pure ethanol is provided above. The temperature was recorded as a 50.0 g sample of solid ethanol was heated at a constant rate. Which of the following explains why the slope of segment T is greater than the slope of segment R ?

• The specific heat capacity of the gaseous ethanol is less

  than the specific heat capacity of liquid ethanol.

• The specific heat capacity of the gaseous ethanol is

  greater than the specific heat capacity of liquid ethanol.

• The heat of vaporization of ethanol is less than the heat

  of fusion of ethanol.

• The heat of vaporization of ethanol is greater than the

  heat of fusion of ethanol.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

The heating curve for a sample of pure ethanol is provided above. The temperature was recorded as a 50.0 g sample of solid ethanol was heated at a constant rate. Which of the following best explains why S is longer than Q?

• S is at a higher temperature than Q resulting in more kinetic energy.

• To vaporize a substance into a gas requires the breaking of all intermolecular interactions whereas to melt simply requires to weaken these interactions.

• It requires more energy to heat a substance at a higher temperature than a lower temperature.

• All intramolecular bonds are broken to vaporize a liquid whereas the intramolecular bonds are still intact as a liquid.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

What state(s) of matter are present at B-C?

• Solid-liquid

• Liquid

• Liquid-gas

• Gas-Solid

Tags

NGSS.MS-PS1-4

Between which points is the kinetic energy of the substance remaining constant?

• A-B only.

• A-B, C-D, E-F

• B-C only.

• B-C, D-E

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-1

NGSS.MS-PS3-4

What part of the curve represent a mixed solid/liquid phase of substance X?

• I

• II

• III

• IV

• V

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

What part of the curve represent a mixed solid/liquid phase of substance X?

• I

• II

• III

• IV

• V

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

What part of the curve represent a mixed liquid/vapor phase of substance X?

• I

• II

• III

• IV

• V

Tags

NGSS.MS-PS1-4

What part of the curve represent a mixed liquid/vapor phase of substance X?

• I

• II

• III

• IV

• V

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Anika, Samuel, and Henry were conducting an experiment in their chemistry class. They recorded the heating curve of a substance as shown in the graph. Based on their observations, what is the boiling point of the substance?

• 100 C

• 60 C

• 80 C

• 20 C

Tags

NGSS.MS-PS1-4

Between which points is the substance changing state?

• A-B only.

• A-B, C-D, E-F

• B-C only.

• B-C, D-E

Tags

NGSS.MS-PS1-4