Unit 9 Review

Potential energy is the energy of motion. 

• true
• false

If you heat 71.5 g of ice at -11.0°C to steam at 120.0°C, how much heat will be used?

• 39,200 J

• 220,310 J

• 225,100 J

• 263,500 J

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-2

NGSS.HS-PS3-4

In an endothermic reaction the system is releasing energy.

• True
• False

For the formula:
 Q= m c ∆T
The  units for specific heat are:

• g /J C
• °C/g J
• kJ/g
• J/g°C

Tags

NGSS.HS-PS3-4

The specific heat is the amount of energy needed to raise the temperature one degree Celsius of a substance.

• True
• False

Tags

NGSS.HS-PS3-4

As a reaction is taken place,  the student notices that the temperature has dropped. This indicates that the system has increased in energy. What type of process is this?

• Endothermic
• Exothermic

Tags

NGSS.HS-PS1-4

Using the heat equation, what would the formula look like if we were solving for change in temperature?

• qm=∆TC_p

• q/mC_p= ∆T

• qm/C_p=∆T

• qmC_p=∆T

A sample of iron receives 50.J of heat energy that raises the temperature of the iron 25.0°C. If iron has a specific heat of .10 J/g°C, what is the mass of the iron sample?

• 25g
• 30g
• 20g
• 50g

If the temperature of copper starts at 15°C and increases to 100°C, what is the change in temperature?

• 115
• 100
• 85
• 15

A piece of metal with a mass of 32.8g is heated to 100.5°C and dropped into 138.2g of water at 20.0°C. The final temperature of the system is 30.2°C. What is the specific heat capacity of the metal?

• 2.56 J/g°C

• 0.391 J/g°C

• 5.29 J/g°C

• 3.50 J/g°C

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-4