UNIT ONE TEST Flashcards
What observation would indicate that an endothermic reaction is occurring in a beaker?
The beaker feels cold because ENDOthermic reactions ABSORB HEAT
What factor is unique for each substance when calculating energy change?
Specific heat
What type of energy flows naturally from a hot object to a cooler object?
Thermal energy
Which term is best used to identify a group of interconnected parts that are surrounded by a barrier?
System
What is an example of an ENDOthermic chemical reaction?
melting ice
What term includes everything other than what is under study?
Surroundings
First law of thermodynamics
Energy cannot be created or destroyed
How does the flow of energy during freezing compare with the flow of energy during melting?
Energy flows out of a substance that is freezing and into a substance that is melting.
How do you determine the specific heat of a substance?
Divide the enthalpy change by the product of the mass and change in temperature.
What types of energy may be released during an EXOthermic reaction?
Thermal heat or light
How is thermal energy involved when a substance freezes?
Thermal energy flows from the substance into the surroundings
Enthalpy
The total amount of energy produced by a chemical system
Exothermic
A reaction that releases heat to the surrounding area
Endothermic
A reaction that absorbs heat from the surrounding area
What types of energy may be released during an ENDOthermic reaction?
thermal or light
