Unit 11

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

• g /J C
• °C/g J
• kJ/g
• J/g°C

What would be the effect on the particles if more heat is supplied to the system?

• They would slow down
• They would stop moving
• They would speed up
• There would be no effect

How many Joules of energy are required to change 10 gram of ice at -2 ^οC to water at 20 ^οC?

• 440 J
• 880 J
• 3,840 J
• 66,000 J

How many Joules of energy are required to change 10 gram of water from 20 ^οC to 90 ^οC?

• 1400 J
• 2800 J
• 210,000 J
• 1,400,000 J

Letter for change in temperature

• q

• m

• c

• ΔT

Letter for mass

• q

• m

• c

• ΔT

What is a tool that measures the heat of chemical reactions?

• calorimeter
•  calorie
• Styrofoam™ cup
• none of these

What does "ΔT" mean?

• A change in time

• A change in heat

• A change in energy

• A change in temperature

When the temperature of a substance increases, what happens to the speed of the molecules?

• stays the same

• increases

• decreases

• not measureable

The heat required to raise the temperature of a substance through 1\degree C

1°C

is:

• heat capacity

• specific heat capacity

• heat

• none of these