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Level 145

Heat & Temperature


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Celsius
A temperature scale with the melting point of ice at 0 degrees and the boiling point of water at 100 degrees.
heat
a measure of how much thermal energy is transferred from a warmer substance to a cooler substance
Kelvin
A temperature scale with the lowest possible temperature at the zero point, which is called absolute zero.
temperature
This is the average kinetic energy of molecules.
Radiation
energy that is radiated or transmitted in the form of rays or waves or particles
Conduction
the direct transfer of heat or sound from one substance to another substance that it is touching
energy is
the ability to do work.
work is
the force applied to an object times distance that the object travels parallel to that force.
heat is
energy that is transferred as a consequence of temperature differences.
First Law of Thermodynamics is
energy cannot be created or destroyed. it can only change form.
hypothesis is
an educated guess that attempts to explain some aspect of the world around us.
a theory is
a confirmed hypothesis.
a scientific law is
a theory that has been subject to centuries of experimentation.
Potential Energy
(mass) x (g) x (height)
kinetic energy
a running dog
Joule
Nm
Celsius (°C) and Kelvin (K)
chemists use which two temperature units?
Fahrenheit (°F)
temperature unit that is familiar is
calibration process is defined as
using certain physical measurements to define the scale of a measuring device.
ice and water will remain at
0.0 °C or 32.0 °F regardless of amount of ice present.
boiling water will remain at
100.0 °C or 212.0 °F whether the water is boiling rapidly or hardly boiling at all.
°C=
5/9( °F-32)
°F=
9/5 (°C) + 32
K=
°C + 273.15
an absolute temperature scale.
Kelvin temperature scale is often called
Calorie (cal) is
the amount of heat necessary to warm one gram of water one degree Celsius.
1 calorie=
4.184 Joules
1,000 chemistry calories (cal).
1 food calorie (Cal) =
q=
m∙c∙ΔT
ΔT=
T final- T intial
Specific Heat
Amount of heat needed to raise the temperature of 1kg of material 1 degree Celsius.
J/ g∙°C
unit for specific heat (c)=
specific heat of water is
1.000 cal/ g∙°C or 4.184 J/ g∙°C
calorimetry is
the experimental process that chemists use to measure heat.
calorimetry equation is
q object q water + q calorimeter