Kinetic energy is energy in motion. Which of these isn't in motion?
A lady walking slowly but surely down a street is moving, right? So that isn't right.
A hockey puck sliding on ice has motion.
A man running around a track definitely demonstrates kinetic energy.
But, a baseball glove doesn't. Maybe if it's moving on someone's hand, but by itself, it isn't moving.
Answer: (i) blue colour fades away
(ii) Single replacement
(iii) copper sulphate + iron iron sulphate + copper
Explanation:
Single replacement reaction is a chemical reaction in which more reactive element displaces the less reactive element from its salt solution.
Here iron being more reactive than copper can easily displace copper from its salt solution and form iron sulphate and copper in elemental form.
The blue colour of the copper sulphate solution fades away.
The word equation is :
copper sulphate + iron iron sulphate + copper
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