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Chemistry /Edexcel A Level Chemistry: 5: Formulae, Equations and Amounts of Substance Part 1

Edexcel A Level Chemistry: 5: Formulae, Equations and Amounts of Substance Part 1

Chemistry25 CardsCreated 10 days ago

This deck covers key concepts related to formulae, equations, and the amounts of substances in chemistry, including moles, molar mass, empirical and molecular formulas, and the ideal gas equation.

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What are amounts of substance measured in?

Moles (mol)
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Key Terms

Term
Definition
What are amounts of substance measured in?
Moles (mol)
What does one mole contain?
A standard number of atoms, molecules or ions
What is the relative atom mass?
The average mass of an element relative to 1/12th of the mass of an atom of carbon-12.
What is molar mass?
The mass of one mole of a chemical with the unit g mol-1.
How would you work out the molar mass of a molecule?
Add up the relative atomic masses of all the atoms in the molecule
How do you work out the amount of substance in moles?
mass of substance(g) / molar mass (g mol-1)
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Edexcel A Level Chemistry: 5: Formulae, Equations and Amounts of Substance Part 1
TermDefinition
What are amounts of substance measured in?
Moles (mol)
What does one mole contain?
A standard number of atoms, molecules or ions
What is the relative atom mass?
The average mass of an element relative to 1/12th of the mass of an atom of carbon-12.
What is molar mass?
The mass of one mole of a chemical with the unit g mol-1.
How would you work out the molar mass of a molecule?
Add up the relative atomic masses of all the atoms in the molecule
How do you work out the amount of substance in moles?
mass of substance(g) / molar mass (g mol-1)
What is a species?
A collective noun to refer generally to atoms, molecules or ions
What is the Avogadro constant?
The number of atoms, molecules or ions in one mole of a substance. 6.02 x 10^23 mol-1
How would you work out the number of atoms, molecules or formula units?
amount of chemical (moles) x Avogadro constant (mol-1)
What is the empirical formula?
The simplest whole number ratio of the atoms of different elements in a compound

How would you work out the empirical formula?

  1. Write down the actual mass of each element

  2. Write down the molar mass of each element

  3. Divide the actual mass by the molar mass for each element

  4. Divide all the numbers by the smallest one

  5. See ratio

What is molecular formula?
The total number of atoms of each element in the molecule
What is percentage composition?
The percentage by mass of each of the elements in a sample of a compound
How would you work out the empirical formula from percentages?
Turn each percentage into grams and assume the total mass of the compound is 100g
What is the ideal gas equation?
pV = nRT
1 atmosphere =
101,325 Pa
1 bar =
100k Pa (100,000Pa)
To convert °C into K…
… +273 to the number
To convert K into °C
Take away 273 from the number
1m^3 =
1000dm^3 (1,000,000cm^3)
R=
8.31JK-1mol-1

What must the units be in the ideal gas equation?

P = Pa
V = m^3
n = moles
T = Kelvin

The gas laws state that the volume of a gas depends on what three things?

  • The temperature

  • The pressure

  • The amount of gas in moles

What could the ideal gas equation be used for?
Measuring the molar masses of gases in the days before mass spectrometry
What is the ideal gas equation accurate enough to determine?
The molecular formula of elements and compounds