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How does the model of ideal gas behaviour help us to predict the behaviour of real gases?
How does the model of ideal gas behaviour help us to predict the behaviour of real gases?
SKILLS Focus
SKILLS Focus
Use basic arithmetic and algebraic calculations to solve problems.
Carry out calculations involving decimals, fractions, percentages, ratios, reciprocals and exponents
Calculate and interpret percentage error and percentage uncertainty.
Apply and use International System of Units (SI) prefixes and units.
Investigate the relationship between temperature, pressure and volume for a fixed mass of an ideal gas and analyse graphs relating these variables.
UNDERSTANDINGS
UNDERSTANDINGS
An ideal gas consists of moving particles with negligible volume and no intermolecular forces. All collisions between particles are considered elastic.
Real gases deviate from the ideal gas model, particularly at low temperature and high pressure.
The molar volume of an ideal gas is a constant at a specific temperature and pressure.
The relationship between the pressure, volume, temperature and amount of an
ideal gas is shown in the ideal gas equation PV = nRT and the combined gas law P1V1/T1 = P2V2/T2 .
MAKING CONNECTIONS
MAKING CONNECTIONS
Structure 2.2—Under comparable conditions, why do some gases deviate more from ideal behaviour than others?
Nature of science, Tools 2 and 3, Reactivity 2.2— Graphs can be presented as sketches or as accurately plotted data points. What are the advantages and limitations of each representation?
Tool 1, Inquiry 2—How can the ideal gas law be used to calculate the molar mass of a gas from experimental data?
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