Showing posts with label states of matter. Show all posts
Showing posts with label states of matter. Show all posts
1. STATES OF MATTER GCSE EDEXCEL CHEMISTRY Explanation
Don't Forget to Read the Specifications before studying to know what is required from you
States of matter
Introduction : Kinetic particle theory
The kinetic particle theory explains the properties of the different states of matter.
The particles in solids, liquids and gases have different amounts of energy.
They are arranged differently and move in different ways.
The kinetic particle theory explains the properties of the different states of matter.
The particles in solids, liquids and gases have different amounts of energy.
They are arranged differently and move in different ways.
1. STATES OF MATTER GCSE EDEXCEL CHEMISTRY NOTES
Don't Forget to Read the Specifications before studying to know what is required from you
States of matter
Introduction : Kinetic particle theory
The kinetic particle theory explains the properties of the different states of matter.
The particles in solids, liquids and gases have different amounts of energy.
They are arranged differently and move in different ways.
The kinetic particle theory explains the properties of the different states of matter.
The particles in solids, liquids and gases have different amounts of energy.
They are arranged differently and move in different ways.
States of Matter - Heating and cooling curves
Changes of states can be explained by using the idea that particles are constantly in motion .
This is called the kinetic particle theory
we can explain a heating curve using ideas about the energy and motion of the particles.
Heating Curve
At point A Physical status is Solid
From A to B increasing heat energy increases vibration of the solid particles so the temperature of the solid increases
From B to C increasing the heat weakens the forces of attraction between particles so they begin to slide over each other . there is no temperature change because all energy supplied is used to overcome the forces between the particles instead of raising the temperature . the substance melts
At C , the substance is all at liquid state.
Note this is the same curve as above
From C to D : increasing the energy increases the motion of the particles in the liquid so the temperature of the liquid increases.
From D to E : forces of attraction between liquid particles weakens to particles start to move away from each other . there is no temperature change as the energy supplied is used to break the forces between the particles , the substance boils .
From E to F : increasing the energy increases the speed of the gas particles . so the temperature increases and the gas particles are getting far away from each other.
Cooling Curve
Almost opposite is happening
See Also
Changes in State of Matter
- Heat must be supplied to a substance for it to melt, evaporate or boil. For example, you need to heat ice to melt it, and you need to heat water to make steam.
- Heat must be removed from a substance to condense or freeze it. In other words, the substance must be cooled down.
Under certain conditions, some solids turn straight into a gas when heated. This process is called sublimation. A good example is solid carbon dioxide, also called ‘dry ice’. At atmospheric pressure, it turns straight into gaseous carbon dioxide.
Liquid carbon dioxide can only exist under high pressure, such as in fire extinguishers. Iodine also sublimes - it turns directly from shiny purple-black crystals to a purple vapour when warmed up.
Subscribe to:
Posts (Atom)