Why does silver jewelry gradually lose its shine?
A thin black layer of silver sulphide forms on its surface.
Silver tarnish removal process - chemical
Aluminum reacts with silver sulfide, restores shine.
How does aluminum remove sulphur from silver sulphide in boiled water?
Because aluminum is more reactive than silver.
Universal indicator measures?
pH, acidity, alkalinity, neutral.
What is a cation in chemistry?
A cation is a positive ion.
Double replacement?
Exchange of cations and anions.
What does a universal indicator show about a solution?
It shows if a solution is acidic, alkaline, or neutral by color change.
Neutralization reaction produces?
Salt and water.
Gas produced in HCl + sodium carbonate?
Carbon dioxide.
pH scale: acids to alkali?
Strong/weak acid, neutral, weak/strong alkali.
Reaction type: acid plus alkali?
Neutralization, forms salt and water.
Test your knowledge with 10 questions on Chemical Reactions and Redox.
1. What causes silver jewelry to develop a black surface layer over time?
2. What is the primary reason silver jewelry loses its shine over time?
Review the complete course in the study sheet for Chemical Reactions and Redox.
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