Thermochemistry

how much is a dietary (Calorie) capital c

1000 calories --> 1 kilocalorie

Diagram on sheet(which diagram illustrates an exothermic process?)

A

Diagram on sheet(which diagram illustrates an endothermic process?)

B

what is the standard unit of heat and energy

Joule

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

what does a (neg) value for heat represent?

a system is losing heat

what generates the heat in a human body?

breakdown of sugars and fats (into)-->carbon dioxide and water

Heat generated by the human body is called?

calories

page 506 17.2 (sitting by campfire=endo or exo)

endo, (absorbing)

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.

page 506 17.2 ( person sweating == endo or exo)

exo, (cooling)

what is a calorie?

heat needed to raise the temp of (1 gram) of water up by (1 degree).

Diagrm A (is heat flow + or -)

neg -

Do samples of 2 different substances that have the same mass,,have the same heat capacity???

no

Does the specific heat of a substance vary with the mass of the sample?

no

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.

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

Diagrm B (is heat flow + or -)

pos +

2kg frying pan or 2g steel pin, which has more heat capacity?

the frying pan ,, because of more mass

what is the (system) and (surroundings)

the mixture of chemicals itself is the (system) and everthing but the mixture is the surroundings

What area of study in chemistry is concerned with the heat transfers that occur during chemical reactions

thermochemistry

where the use of energy is concerned, when is work done?

work is done when a force is used to move an object.