TOPIC 5 - Formulae, equations and amounts of substance
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What is Avogrado’s number?
6.02x1023 Number of atoms or molecules in 1 mole.
What is the equation for number of moles, mass and Mr?
What is the equation for number of moles, concentration and volume?
What is the empirical formula?
Simplest whole number ratio of elements in a compound.
How can you get an ionic equation from a normal equation?
• Split soluble compounds into ions. • Remove spectator ions. • Balance.
What is a displacement reaction?
A reaction where a more reactive element takes the place of a less reactive element.
What is a precipitation reaction?
A reaction where a solid is produced from aqueous reactants.
What is the equation for number of moles, volume and molar gas volume in gases?
What is the value of the molar gas volume at room temperature and pressure? (293K, 101.3kPa)
24dm3mol-1
What is the value of the molar gas volume at standard temperature and pressure? (273K, 101.3kPa)
22.4 dm3mol-1
What is the ideal gas equation?
What colour does phenolphthalein turn in Acid?
Colourless
What colour does phenolphthalein turn in Alkali?
Pink
What colour does methyl orange turn in acid?
Yellow
What colour does methyl orange turn in alkali?
Red.
What are concordant results? (when talking about titres)
Results withn 0.1cm3 from each other.
How can we calculate uncertainty from measuring apparatus?
Uncertainty is half the smallest increment the equipment can measure.
What is the equation for % yield?
What is the theoretical yield?
The amount of product produced assuming no products are lost and all reactants react together.
What is the equation for atom economy?
What are the advantages of high atom economy?
• Less waste - better for the environment. • Raw materials are used more efficiently. • Less by-products so less time and money spent in separating the desirable product.