Separate Chemistry 1 Flashcards
What can a titration be used to find?
Concentrations
Should you add the acid or alkali into the burette?
Acid
Why do you do a rough titration first?
So you know the rough location of the titre.
It takes 50cm3 of 0.25mol sulfuric acid to nutrilise75cm3 of Sodium hydroxide. Find the concentration of Sodium Hydroxide: 2NaOH+H2SO4-> Na2SO4+2H2O
0.333333333mol/dm3
What does % yield compare?
Actual and Theoretical Yield
What is the Theoretical Yield?
The mass of Product you make if all the reactants were converted into products.
2Fe2O3 + 3C -> 4Fe + 3CO2. Calculate % Yield if you start with 45Kg of Iron Oxide and produced 20Kg of Iron.
63.4920635%
What does 100% yield mean?
You got all the products you expected to get
Give 3 reasons why you don’t get 100% yield?
Incomplete Reactions
Practical Losses
Unwanted reactions occurring
What is Atom Economy?
The % of reactants changed into useful products
What is the formula for Atom Economy?
Atom Economy=(total Mr of desired products/total Mr of all products.)*100
What does 100% atom economy mean?
All the atoms in the reactants have been turned into useful products
What 2 things is high atom economy good for?
Profits and the Environment
Do higher pressures favour the forward or backward reaction in the Haber Process?
Forward
Do higher temperatures favour the forward or backward reaction in the Haber Process?
Backward