GCSE Chemistry C3 - Energy, Acids, Reversible Reactions and Organic Chemistry Flashcards
propanol, methanol and ethanol are all alcohols. Which one is found in drinks?
Ethanol
2H2 + O2 < –> 2H2O. Assuming all theses are gases, does increasing the pressure increase or decrease the yield?
It increases it as increasing pressure favours decreasing number of molecules.
A reversible reaction that is exothermic in the forward direction is heated - what happens to the yield?
It decreases
A reversible reaction that is endothermic in the forward direction is heated - what happens to the yield?
It increases
What is ‘combustion’?
Burning in oxygen
What is the pH of a solution of methanol in water?
pH 7 - neutral
What does ‘ionise’ mean in relation to an acid?
the acid molecule splits up to form a positive H+ ion and a negative ion.
What is produced when sodium is added to ethanol?
Hydrogen gas and a salt (sodium ethanoate)
Give 2 uses of any alcohol
solvent, fuel
What is activation energy?
The amount of energy required to make a reaction happen
What is the unit used to measure energy?
Joules
What is made when ethanol is oxidised?
ethanoic acid
What is meant by a reaction that has reached equilibrium?
When a reversible reaction is happening in both directions at the same rate
What is calorimetry measuring?
The amount of energy released when a substance burns.
What temperature change is associated with an exothermic reaction?
An increase - heat given out
