Chemistry /Edexcel A Level Chemistry: 5: Formulae, Equations and Amounts of Substance Part 2

Edexcel A Level Chemistry: 5: Formulae, Equations and Amounts of Substance Part 2

Chemistry28 CardsCreated 10 days ago

This deck covers key concepts related to formulae, equations, and amounts of substances in chemistry, including gas laws, concentration calculations, and yield measurements.

What is the molar volume of a gas?

The volume of 1mol of the gas under stated conditions. At room temperature and atmospheric pressure the molar volume of all gases is 24dm-3mol-1
Tap or swipe ↕ to flip
Swipe ←→Navigate
SSpeak
FFocus
1/28

Key Terms

Term
Definition
What is the molar volume of a gas?
The volume of 1mol of the gas under stated conditions. At room temperature and atmospheric pressure the molar volume of all gases is 24dm-3mol-1
What is room temperature?
16°C
What is atmospheric pressure?
100kPa
Volume of gas (cm3) =
Amount of gas (mol) x molar volume (cm3 mol-1)

How would you calculate the amounts of reactants and products?

  1. Write a balanced equation

  2. Write down the amounts in moles of the relevant reactants and products in the equation

The volume of gas, under a given temperature and pressure depends only on…
…the amount of gas, not the type of gas

Related Flashcard Decks

Study Tips

  • Press F to enter focus mode for distraction-free studying
  • Review cards regularly to improve retention
  • Try to recall the answer before flipping the card
  • Share this deck with friends to study together
TermDefinition
What is the molar volume of a gas?
The volume of 1mol of the gas under stated conditions. At room temperature and atmospheric pressure the molar volume of all gases is 24dm-3mol-1
What is room temperature?
16°C
What is atmospheric pressure?
100kPa
Volume of gas (cm3) =
Amount of gas (mol) x molar volume (cm3 mol-1)

How would you calculate the amounts of reactants and products?

  1. Write a balanced equation

  2. Write down the amounts in moles of the relevant reactants and products in the equation

  3. Convert these amounts in moles of the relevant reactants and products into masses

  4. Scale to the quantities required

The volume of gas, under a given temperature and pressure depends only on…
…the amount of gas, not the type of gas
Concentration (g/dm-3) =
Mass of solute (g) / volume of solution (dm-3)
Concentration (mol/dm-3) =
Amount of solute (mol) / volume of solution (dm3)
What is the concentration of a solution?
How much solute is dissolved in a certain volume
What is a titration?
A volumetric analysis technique for finding the concentrations of solutions and for investigating the amounts of chemicals involved in reactions
What is a standard solution?
A solution with an accurately known concentration
What is a primary standard?
A chemical which can be weighed out accurately to make up a standard solution
The method for preparing a standard solution is only appropriate with a chemical that is…
is very pure
does not gain or lose mass when in the air
has a relatively high molar mass so that weighing errors are minimised
What was the ideal gas equation used for?
Measuring the molar masses of gases before mass spectrometry
What is the ideal gas equation accurate enough to determine?
The molecular formula of elements and compounds
What does the ideal gas equation show?
That at a fixed temperature and pressure the volume of a gas depends only on the amount of moles.
How do you calculate the masses of reactants and products?
Write a balanced equation
What is an uncertainty?
The amount of error your measurements might have?
For any piece of equipment, what will the uncertainty be?
Half the smallest increment of measure in either direction
What should be done if different measurements are being combined?
Their uncertainties should be combined
How would you calculate percentage uncertainty?
Uncertainty/reading x 100
How can uncertainty be reduced?
By using the most precise equipment possible and the largest measurements
What is theoretical yield?
The maximum that you could get
How would you calculate theoretical yield?
Using the moles of reactants and products
How would you calculate percentage yield?
Actual yield/theoretical yield x 100
What is atom economy?
A measure of how efficient the reaction is
How would you calculate atom economy?
Molar mass of desired product/combined molar masses of all products x 100