Why does silver jewelry gradually lose its shine?
A thin black layer of silver sulphide forms on its surface.
How does aluminum remove sulphur from silver sulphide in boiled water?
Because aluminum is more reactive than silver.
What is a cation in chemistry?
A cation is a positive ion.
What does a universal indicator show about a solution?
It shows if a solution is acidic, alkaline, or neutral by color change.
Silver tarnish removal process - chemical
Aluminum reacts with silver sulfide, restores shine.
Universal indicator measures?
pH, acidity, alkalinity, neutral.
Double replacement?
Exchange of cations and anions.
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.
Answer 10 questions on Chemical Reactions and Redox.
1. What causes silver jewelry to develop a black surface layer over time?
2. Why does aluminum foil help restore the shine of tarnished silver in boiled water with sodium bicarbonate?
Go over the full study guide for Chemical Reactions and Redox.
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