Thermochemistry

The specific heat of aluminum is 0.21 J/g°C.  How much heat(Q) is released when a 10 g piece of aluminum foil is taken out of the oven and cools from 100° to 50°?

• 105 J
• 10.5 J
• 1.05 J
• 0.105 J

Tags

NGSS.HS-PS3-4

20 g of water. specific heat of water is 4.18 J/g°C.  temperature changes from 25° C to 20° C, how much heat energy (q) moves from the water to the surroundings?

• 400 J
• 210 J
• 80 J
• 4.18 J

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-4

What does temperature measure?

• Heat
• ºC
• Kinetic Energy
• Thermal Energy

In an endothermic reaction the system is releasing energy.

• True
• False

For an endothermic reaction, the heat is on the ____ side.

• reactant
• product
• either side

Tags

NGSS.HS-PS1-4

For an exothermic reaction, the heat is on the ____ side

• reactant
• product
• either side

What type of reaction is shown in the picture?

• endothermic
• exothermic

Tags

NGSS.HS-PS1-4

In an exothermic process, the surroundings are are gaining energy.

• True
• False

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

If two objects have different temperatures, 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

What is the specific heat of an unknown substance if 100.0 g of it at 200.0 °C reaches an equilibrium temperature of 27.1 °C when it comes in contact with a calorimeter of water.  The water weighs 75. g and had an initial temperature of 20.00 °C?  (Specific heat of water is 4.18 J/g°C) (show your work)

• 0.111 J/g°C
• 1.29 J/g°C
• 0.129 J/g°C
• 22225.85 J

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-4