Types of Energy
Energy at the rest
Potential Energy
What are the 3 most common units of temperature?
Kelvin, degrees Fahrenheit, degrees Celsius
Phase changes are examples of....
physical change
Diagram that show the change in temperature and heat during phase change is known as ...
Heating or Cooling Curve
The heat of fusion is used during which phase change?
Melting or Freezing
Joules
At STP what is the temperature value in Celsius and in Kelvin?
0 degrees Celsius
and
273 Kelvins
Boiling and melting are examples of ...
Endothermic reactions
Does cooling curve show endothermic or exothermic reaction? Why?
Exothermic, because heat is released
How many kilojoules of heat are needed to raise the temperature of 500. grams of water from 10.0°C to 30.0°C?
41.8 kJ
This energy has direct relationship with the temperature of a substance
Kinetic Energy
What Kelvin temperature is the same as −13° Celsius?
260K
Condensation is considered an exothermic reactions because...
Energy is being released
During which intervals is potential energy constant and average kinetic energy is changing? Name the phases
Solid, Liquid and Gas phase
How much energy does it take to boil a 125 g sample of water?
282,000 J
The form of energy that flows from hot to cool region.
Heat
What is the value of absolute zero in Kelvins and in degrees Celsius?
0 Kelvins
and -273 degrees Celsius
I2(s) → I2(g)
What phrase describes this change?
Endothermic physical change.
During which intervals is potential energy decreasing and average kinetic energy remaining constant? Name the phases
Condensation and Freezing
When 84 joules of heat are added to 2.0 grams of water at 15°C, what will be the final temperature of the water?
25°C
What does the law of conservation of energy state?
Energy can neither be created nor destroyed; ergy
Temperature of the substance is equal to
Average Kinetic Energy
The temperature at which a object begins to freeze is known as ....
Melting point
The temperature at which liquid begins to turn into gas is known as ...
Boiling point
Calculate the amount of heat needed to melt 35.0 g of ice at 0 ºC
11, 620 J