Give reasons :
Aluminium is more abundant than gold in the Earth's crust, yet it is the gold and not aluminium that has been known to man since ancient times.

Aluminium is the most abundant metal in the earth's crust.

Give reason why : Is sodium more reactive than aluminium ?

Give reason A bench made of aluminium feels colder than a wooden one.

A:Oxygen is the most abundant element on the surface of earth. R: Aluminium is the most abundant metal in Earths crust.

Both sodium and potassium are present in equal abundance in the earth's crust, but sodium is about 30 times as abundant as potassium in oceans. Give reasons.

Give reason for the following. Weight of an object on Jupiter is more than that on the Earth.

Give reasons A ball resting on the top of a table has more energy than the one lying on the ground.

Most chickens reach maturity and begin laying eggs at around 20 weeks of age. From this point forward, however, as the chicken ages,its eges its egg production decreases. A farmer was given a flock of 100 chickens (all of which were the same age) and asked to meaure daily egg output for the entire flock at random intervals starting at maturity until the chickens were 70 weeks old. The data are recorded in the scatteplot below and the line of best fit has been drawn. How many times did the farmer's data differ by more than 5 eggs from the number of eggs predicted by the line of best fit ?

Give reasons (a) Platinum, gold and silver are used to make jewellery. (b) Sodium, potassium and lithium are stored under oil. (c) Aluminium is a highly reactive metal, yet it is used to make utensils for cooking. (d) Carbonate and sulphide ores are usually converted into oxides during the process of extraction.