Please answer them fast
Answers
1 ) They are alkali metals and alkali metals are soft enough to be cut with knife
2) Lithium is less dense than water so they float on the surface of the water.
4) These metals are called so because when looking at the reactivity series of metals, these metals are placed at last of the series which shows that they show negligible reaction to other elements.
5) Machine parts are frequently oiled or greased to reduce friction between its parts. If friction will be more (high) , more heat will be generated between the parts decreasing the efficiency of the machine. Thus the machine parts are frequently oiled and greased.
7) Base metals that chrome plating can be applied to include: steel, stainless steel, copper, brass, bronze, and more. Depending on the specific purpose, hard chrome plating can vary widely in thickness to meet precise project needs
8) They are used so because of their density and large number of electron
9) Copper is used for making the bottom of cooking utensils because it is a good conductor of heat.
10) Aluminum provides a better conductivity to weight ratio than copper, and therefore is also used for wiring power grids, including overhead power transmission lines and local power distribution lines, as well as for power wiring of some. It has cost and weight advantages over copper wires.
Bro u asked so much I can't answer that much. so ... sorry
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