calorie
quantity of heat needed to raise the temperature of 1g of WATER by 1C
joule
SI unit of energy
specific heat
quantity of heat needed to change the temperature of 1g of a SUBSTANCE by 1C
heat capacity
quantity of heat needed to change the temperature of an object by 1C w/no mass
calorimeter
device used to measure the heat absorbed or released during a chemical or physical processes
enthalpy
heat content of a system also g or delta H
Heat flows from the warmer object to the cooler object until they reach the same temperature
how is thermal energy transferred between two objects that are at different temperature
b. evaporation
which of these phase changes is an endothermic process? a. condensation b. evaporation c. freezing d. all phase changes are endothermic
d. materials in the surroundings of the system
during an endothermic chemical reaction, what is the source of energy that causes the reaction to continue
a. they are two different measures of amounts of energy
how do calories and joules differ from one another
b. all of the energy can be accounted for
what happens when energy is changed from one form to another
heat capacity and mass of material that absorbs the heat, temperature change
what 3 factors do you need to know in order to calculate the heat change of a chemical reaction in a calorimeter
greater than the energy stored in the bonds of the products
which statement correctly describes the energy of the chemical bonds of the reactants in an exothermic reaction
endothermic process
a process that absorbs heat is a(n)
the same amount of heat is released
when your body breaks down sugar completely, how much heat is released compared to burning the same amount of sugar in a flame
the amount of heat cannot be calculated because the heat capacity is not known
a 100 gram piece of heated iron cools from 50 to 20C how much heat is released to the surroundings
liquid water
which of the following substances has the highest specific heat
its mass
by what quantity must the heat capacity of an object be divided to obtain the specific heat of that material
the heat of reaction for a chemical reaction
what does the symbol delta H stand for
some of the water freezes, so the chunk of ice gets larger
a chunk of ice whose temperature is -20C is added to an insulated cup filled with water at 0C what happens in the cup
heat of combustion
the amount of heat releases by the complete burning of I mole of a substance
molar heat of fusion
the amount of heat needed to melt one mole of a solid at a constant temperature
remains constant
during a phase change the temperature of a substance
dissolving silver nitrate is an endothermic process
the molar heat of solution of silver nitrate at 25C is 22.6 KJ/MOL which statement about silver nitrate is true