Question

Substance :
BOD
It is a shiny liquid. The melting point is -39°C and the
boiling point is 357C. It conducts electricity,
For the substance given
.
Decide if it is a metal or a non metal, and give your reasons,
Try to identify it
State a use for it
.
Substance A is a metal/ Non metal
My reasons for deciding this are:
I think the name of the substance is

Answer 1

Answer:

Ur test is not over yet!

my god...

The following are the physical properties of metal :

The physical properties make them useful for many purposes. For e.g. Copper is used in making electric wires, gold is used to make jewellery, stainless steel is used to make pots, pans, etc

Metals react with nonmetals to form ionic bonds. For e.g. Sodium Chloride (NaCl)

Metals are a good conductor of electricity which means that they can conduct electricity due to the free moving electrons present in them. Copper is used as wiring as it is a good conductor of electricity.

Metals have high melting points and high boiling points as they have strong metallic bonds.

All metals are physically lustrous. They have a lustre that makes them shine. Gold is used for making jewellery.

Metals are hard, they can’t be broken easily and require a lot of energy and strength to break. Iron is used to make cars, buildings, ships, etc.

Metals weigh a lot as they have a high density. Metals are heavy for their size.

They don’t have flexibility and have tensile strength. Metals can’t be stretched.

Metals are great conductors of heat. That’s why pots, pans, vessels are made of metals.

hope this answer is helpful

Answer 2

The name of the substance is Mercury (Hg).

The following points justify it:

• Clearly, the given substance is metal as it can conduct electricity.

• Mercury is a shiny substance that exists in a liquid state at room temperature despite of being a metal.

• This is possible because of the low melting point of mercury of  -39 °C and its boiling point is close to 357 °C.

• Mercury is an excellent conductor of electricity as the energy band gap value in metal is low, electrons can easily jump into the conduction band and hence conduct electricity.
• Thus, it is used in the making of electrical switches and circuits.
• One more significant use of mercury is in the making of temperature measuring instruments, i.e., thermometers, and also to make fluorescent light bulbs.

Thus, from the above-given characteristics, we can prove the given substance is mercury.

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