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
What are the compromise conditions reached in the Haber Process?
200 atm of pressure and 450C
What is the catalyst used in the Haber Process?
Iron
What do fertilisers do?
Help plants grow
Which are the 3 main elements needed for plants to grow?
Nitrogen, Potassium and Phosphorus
What Is used to produce nitrogen-containing compounds?
Ammonia
Give the balanced equation to create ammonium salts.
NH3+HNO3–> NH4NO3
Give one way you can make ammonia sulfate in the lab.
Using titrations with ammonia and sulfuric acid
What is the equation to calculate the volume of gas from the number of moles?
Molar Volume=Volume/Moles
What volume does one mole of gas always occupy at RTP?
24dm3
How many moles are there in 8280cm3 of chlorine gas at RTP?
0.345moles
What is the only product of the reaction in a hydrogen-oxygen fuel cell?
Water
What is the overall balanced equation for the reaction in a hydrogen-oxygen fuel cell?
2H2 + O2 –> 2H2O
Give 2 reasons why hydrogen fuel cells will not be widely used for a while.
Very explosive and hard to store the hydrogen
Hydrogen takes up a lot of space in storage
Hydrogen comes from hydrocarbons that comes from crude oil
