Thermo Exam

A substance with a high specific heat:

• Is always extremely hot.
• Requires a lot of energy to become hot.
• Is not heavy.
• Does not requires a lot of energy to become hot.

Do molecules generally move faster at 45 C or 106 C?

• 45 C because molecules have more energy than in 106C

• 106 C because molecules have more energy than in 45C

• 106 C because molecules have less energy than in 45C

• 45C because molecules have less energy than in 106 C

To freeze water …

• energy must be added to the water

• energy must be removed from the water

What  is the formula to calculate heat energy required to raise the temperature of any substance?

• Q=mc∆t
• Q=mc
• Q= ½mv
• m=QC

Gold cools more quickly than aluminum. This means …

• gold has a larger heat capacity

• aluminum has a larger heat capacity

• they have the same heat capacity

• What is heat capacity?

If a cup of hot coffee and a glass of cold milk are placed on a table and come in contact, heat will flow from the warmer to the cooler one UNTIL ____________

• the coffee reaches a temperature of zero

• they both reach an equal temperature

• the coffee runs out of energy

If the specific heat of water is 4.18 J/g∙°C, how much heat is required to increase the temperature of

1200 g of water from 23 °C to 39 °C?

Round to the nearest whole number.

Mathematical Equivalence

ON

Match the following types of energy to their general definition or example.

• energy stored in bonds

• gravitational

• energy stored in a compression

• chemical

• flow of electrons through a conductor

• nuclear

• potential energy due to a high position

• electrical

• energy released during fission or fusion

• elastic

Label the states of matter on this phase diagram.

a

b

c

gas

solid

liquid

Calorimetry Question:
A piece of metal with a mass of 32.8 g is heated to 100.5°C and dropped into 138.2 g 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? (show your work)

• 2.56 J/g°C
• 0.391 J/g°C
• 5.29 J/g°C
• 3.50 J/g°C