C3.2 + C3.3 - Exo,Endo , Redox. Acids Flashcards
If the temperature of the reaction mixture increases during a chemical reaction, it is?
Exothermic
What is an example of an exothermic reaction?
Combustion, fuel burning to cook food
If the temperature of the reaction mixture increases during a chemical reaction, it is?
Endothermic
What is an example of an endothermic reaction?
Photosynthesis, CO2 and water reacting to form sugars by using energy in light
Where should the arrow be pointing for activation energy in a reaction profile?
Up
What is activation energy?
Minimum energy needed for a reaction to start
If the energy increases in a reaction profile, is it exo or endothermic?
endothermic
What is a redox reaction?
When reduction and oxidation happen at the same time
What is reduction?
Loss of oxygen from substance
What is oxidation?
Gain of oxygen for a substance
What is the reducing agent?
The substance which gains the oxygen
What is the oxidising agent?
The substance which loses the oxygen
What does OILRIG mean?
Oxidation is loss
Reduction is gain
(in terms of electrons)
What is an acid?
A substance that releases hydrogen ions when dissolved in water.
What is a base?
A substance that can neutralise an acid
What is an alkali?
A substance that releases hydroxide ions when dissolved in water
How do you know what colour is what pH?
Its the rainbow, red = pH 1
What is neutralisation?
Reaction between an acid and a base, or alkali to form only salt and water
What do acidic solutions contain?
Hydrogen ions
What do alkaline solutions contain?
Hydroxide ions
What are carbonates?
Ionic compounds that contain the carbonate ion ( CO3 ^2-
What is the difference between a weak and a strong acid?
Weak acids partially ionise but strong acids fully ionise
Give an example of a strong and weak acid
Strong - Nitric acid
Weak - Ethanoic acid
