What area of study in chemistry is concerned with the heat transfers that occur during chemical reactions
where the use of energy is concerned, when is work done?
work is done when a force is used to move an object.
what is true about energy?
energy is the capacity for doing work or suppling heat+energy is detected only because of its affects+ gasoline contains a significant amount of chemical potential energy.
what is true about heat?
one effect about adding heat to a substance is an increase in the temp of the substance.+ if 2 objects remain in contact,heat will flow from the warmer to the cooler.
what is the (system) and (surroundings)
the mixture of chemicals itself is the (system) and everthing but the mixture is the surroundings
In thermochemical calculations, is the direction of the heat flow given from the point of view of the system or the surroundings?
point of view
what universal law states that energy can neither be created or destroyed and is work, stored potential energy, or heat?
Law of conservation of energy
Diagram on sheet(which diagram illustrates an endothermic process?)
Diagrm A (is heat flow + or -)
Diagram on sheet(which diagram illustrates an exothermic process?)
Diagrm B (is heat flow + or -)
what does a (neg) value for heat represent?
a system is losing heat
page 506 17.2 (sitting by campfire=endo or exo)
page 506 17.2 ( person sweating == endo or exo)
Heat generated by the human body is called?
what generates the heat in a human body?
breakdown of sugars and fats (into)-->carbon dioxide and water
what is a calorie?
heat needed to raise the temp of (1 gram) of water up by (1 degree).
how much is a dietary (Calorie) capital c
1000 calories --> 1 kilocalorie
what is the standard unit of heat and energy
Do samples of 2 different substances that have the same mass,,have the same heat capacity???
2kg frying pan or 2g steel pin, which has more heat capacity?
the frying pan ,, because of more mass
Does the specific heat of a substance vary with the mass of the sample?