Which segment represents the heat of fusion?

• A-B
• B-C
• C-D
• D-E

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Which process takes the longest to occur?

• melting
• boiling
• freezing
• heating the solid

Tags

NGSS.MS-PS1-4

Between which points is the temperature 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-PS3-4

Thermal energy always moves:

• From a high temperature object to a lower temperature object.

• From a lower temperature object to a higher temperature object.

• From an object with lower kinetic energy to an object with higher kinetic energy.

• From an object of higher mass to an object of lower mass.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

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

If two objects have different temperatures when they come in contact, heat will flow from the warmer object to the cooler one UNTIL ____________

• one reaches a temperature of zero

• they both have an equal temperature

• one runs out of energy

Tags

NGSS.HS-PS3-4

For a skillet, used for cooking, do you want a high or low specific heat?

• High, so that it will need more energy to heat up

• Low, so that it will change temperature quickly

A sample of iron receives 50. J of heat energy that raises the temperature of the iron by 25.0°C. If iron has a specific heat of 0.10 J/g°C, what is the mass of the iron sample? (show your work)

• 25 g

• 30. g

• 20. g

• 50. g

A reaction is performed in a beaker with a temperature probe recording the temperature changes of the reaction. If the temperature began at 15.0 °C  and ended at 27.5 °C.  Is the reaction endothermic or exothermic?

• Exothermic

• Endothermic

Which equation would you use to solve the following: Calculate the heat necessary to change 10.0 g of H₂O(l) at 0.0 °C to 10 g of H₂O(l) at 100.0°C.

• $q=n\Delta H_{vap}$

• q=mCΔT

• $q=n\Delta H_{fusion}$

• PV=nRT