Moles And Titrations Flashcards
The more solute you dissolve in a given volume…?
The more crowed the solute molecules are and the more concentrated the solution
1000cm3=?
1dm3
What can Titrations allow you to do?
To find out how much acid is needed to neutralise a quantity of alkali or vice versa
How do you do this titration?
1) put alkali in flask with some indicator - not universal as it only changes colour gradually use methyl orange
2) add acid bit at a time and the indicator will change colour when all all alkali has been neutralised, yellow in alkalis but red in acids
3) record how much acid need to neutralise and repeat
Concentration = moles / volume
moles / volume
Energy must always be supplied to…?
Energy is always released when…?
Break bonds - endothermic
When bonds form - exothermic
How is fuel energy calculated?
Using a calorimetry
What are the consequences of fuels providing energy?
Global warming and climate change
Non renewable - becoming more expensive
What is shown in a exothermic graph?
The products are at lower energy then the reactants
What does the endothermic graph show?
Products are at a higher energy than the reactants
What is activation energy?
How can it be lowered?
Represents the minimum energy needed by reacting particles to break their bonds
By adding a catalyst
Hydrogen + oxygen –> ?
Water
Exothermic reaction
What are the pros for burning hydrogen gas in oxygen to make a fuel?
Very clean as it only forms water
What are the cons?
Need special expensive equipment
What’s a fuel cell?
Electrical cell that’s supplied with a fuel and oxygen and uses energy from the reaction between them to generate electricity
