Chemistry S1.1.3 | Free Chemistry Video | RevisionDojo
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Chemistry S1.1.3
Learn Chemistry S1.1.3 in this free IB Chemistry video lesson for S1.1.3 Temperature and Kinetic Energy.
About this video
Learn Chemistry S1.1.3 in this free IB Chemistry video lesson for S1.1.3 Temperature and Kinetic Energy.
Summary of the Video
This video explains the Celsius and Kelvin temperature scales, their relationship, and how to convert between them. The Kelvin scale is an absolute scale with no negative values, starting at 0 K (absolute zero). The conversion formulas are:
From Celsius to Kelvin: K=°C+273.15
From Kelvin to Celsius: °C=K−273.15
For example, 25°C equals 298.15 K, and equals . Both scales have the same unit increment, meaning a change of equals a change of .
Video transcript
00:00In this video, which is
00:01structure 1 .1 .3, we're
00:03going to look at two
00:04temperature scales, which are the
00:06Celsius scale and the Kelvin
00:07scale, and then we'll look
00:09at observable changes in physical
00:12properties and temperature during changes
00:14of state. So we'll start
00:17by looking at the two
00:18temperature scales, so on the
00:19left in this diagram we
00:20have the Kelvin scale, and
00:22on the right we have
50 K
-223.15°C
1 K
1°C
The relationship between temperature in Kelvin and average kinetic energy is directly proportional. For instance, a substance at 400 K has double the average kinetic energy of a substance at 200 K.
The video also discusses heating curves during phase changes, using water as an example:
Solid to liquid (melting): Temperature remains constant at 0°C as heat is used to overcome intermolecular forces.
Liquid to gas (boiling): Temperature remains constant at 100°C while intermolecular forces are broken.
During phase changes, added heat increases potential energy rather than kinetic energy, resulting in no temperature change.