Q1: Why gold coins stay shiny for hundreds of years ?
Q2: Why zinc protects steel boats by sacrificial protection?
Q3: Why footballer's shoes are studded?
Q4: Why camels have wide and flat feet?
Q5: Why copper sulphate solution is heated over a water bath to form crystals?
Q6: Why blades of knives and scissors have very small area?
please give me all answers in scientific reasons please
Answers
Answer:
1) gold coins stay shiny for hundreds of years because it is highly unreactive, lustre,malleable.
2) To protect the hulls, the ship builders put pieces of Zinc on these hulls. The Zinc components used on ships are called “Sacrificial Anodes”. ... Zinc is used because it has a higher voltage in the water so the current is more inclined to flow from it than from the propeller.
3) The football shoes have spikes or studs because the studs or spikes provides larger frictional force than normal shoes while running on the grass. The studs prevents player from slipping on the grass and help to run faster and change direction quickly without slipping.
4) Camels have large flat feet so that there is a greater area in contact with the sand which produces less pressure on the sand and the camels can move easily on the sand.
5) Pure copper sulphate is obtained from an impure sample by re-crystallization. The sample is mixed in water and filtered to remove impurities. It is then heated gently on a water bath for evaporation of water. Thus, a saturated solution is obtained.
6) The cutting edges of the tools like knives, scissors and blades have been provided by the sharp edges to allow the cutting of things easily with the sharp edges. The smaller the surface area over the force is applied, hence more pressure can be applied on the surface.
hope this will help you❤
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Answer:
1.Gold will keep it's "shiny appearance for the longest" amount of time since it effectively will never loose its reflectivity. As for which Tarnish es quicker: iron will oxidize and thus react with the oxygen in the atmosphere creating iron oxide or Rust .
2. The Zinc components used on ships are called “Sacrificial Anodes”. ... They are made of metals more reactive than the material used for the ship's body and systems. As such, they shield the ship's body and systems while the ship stays protected, giving rise to the name 'Sacrificial Anodes'.
3.The football shoes have spikes or studs because the studs or spikes provides larger frictional force than normal shoes while running on the grass. The studs prevents player from slipping on the grass and help to run faster and change direction quickly without slipping.12-May-2019