A compound X present in a dry test tube is heated and produces brown fumes.
Name compound X and the brown fumes
Compound X is leadnitrate and the brown fumes are nitrogen dioxide
A good example of an exothermic reaction is respiartion
A reaction where oxygen is gained or hydrogen is lost, is known as oxidation reaction
A reaction where oxygen is lost or hydrogen is gained is known as reduction reaction
When both oxidation and reduction take place in a single chemical chemical reaction, it is known as redox reaction
Rancidity takes place in fats and oils
When fats and oils are left in the open for too long, they become rancid, inedible and produce foul smell. This is known as Rancidity
Explain Corrosion
Corrosion is the phenomenon in which metals deteriorate gradually in the presence of oxygen and air
State the prevention methods for rancidity
Adding antioxidants
Storing food in airtight containers
Replacing air by nitrogen
refrigeration
Prevention methods for corrosion
Galvanization
electroplating
painting
Why is it advised to clean a magnesium ribbon before burning it?
Magnesium ribbon reacts with the atmospheric oxygen to form a layer of magnesium oxide which is a stable compound. To prevent further reactions with oxygen, it is therefore necessary to clean a magnesium ribbon before burning it