Opposite polarity poles attract one another when they are close enough for the magnetic lines of flux to interact with one another. Like polarity poles repel one another when they are close enough for the magnetic lines of flux interact with one another.

Every magnet has a north and a south pole. Two like poles will repel each other but opposites attract. The force between magnets depends on the separation distance and the flux density (magnetic strength) of the magnets used.

In magnets like poles repel each other and unlike poles attract each other. So when placing the north pole of two magnets close together they will repel.

While storing bar magnets, they should be kept in pairs with their unlike poles on the same side. They must be separated by a piece of wood while two pieces of soft iron should be placed across their ends.

The magnet exerts its influence in the region surrounding it. Therefore the iron filings experience a force. The force thus exerted makes iron filings to arrange in a pattern. The lines along which the iron filings align themselves represent magnetic field lines.

Why do iron filings arrange themselves in a definite pattern when sprinkled around a magnet? Solution : This is due to the reason that each piece of iron filling becomes a small magnet and experiences a force in a certain direction in the magnetic field due to the magnet.

Why do iron filings arrange themselves in a definite pattern when sprinkled around a magnet? This is due to the reason that each piece of iron filling becomes a small magnet and experiences a force in a certain direction in the magnetic field due to the magnet.

When iron filings are sprinkled on a bar magnet, you see that these magnetic field lines start at the magnet’s north end and will end at the magnet’s south end. The field lines that curve toward each other show attraction. You will even see these curved lines if you sprinkle iron filings on two attracting bar magnets.

Two magnetic field lines do not intersect each other due to the fact that the resultant force on a north pole at any point can be only in one direction. this means that resultant force on a north place at the point of intersecting will be along two directions, which is not possible.

Iron has a strong molecular force of attraction. But iron fillings when sprinkled in flames attain the ignition temperature ( as iron fillings are comparatively smaller particles) and gain larger surface area for the reaction. Therefore they burn vigorously.

1 Answer. Iron has a strong molecular force of attraction. Hence when heated it doesn’t reach its ignition temperature and doesn’t burn. But iron fillings when sprinkled in flames attain the ignition temperature ( as iron filings are comparatively smaller particles) and gain a larger surface area for the reaction.

Answer Expert Verified To burn the surface of iron in contact with air must be heated to its ignition temperature. Iron has a strong molecular force of attraction. Hence when heated it doesn’t reach to its ignition temperature and doesn’t burn.

The iron will burn until consumed entirely producing iron oxide. There is much more O2 available in the atmosphere than needed to consume the iron. The amount of iron oxide produced is determined by the amount of iron powder, not the amount of oxygen. Thus the iron is the limiting reactant.

First iron turns into red (lower energy corresponding to higher wavelength) and as the temperature rises it glows and turns into orange, yellow, blue respectively (higher energy and lower wavelength). If we go on heating the rod it turns into white light which includes all visible wavelengths.

The alkali metals are highly reactive and burn very easily. Sodium and potassium are kept in kerosene oil so that they don’t get oxidized by air. Also, alkaline earth metals like magnesium burn very easily also. That’s it.

Transition metals react with oxygen to form metal oxides. However, gold, silver, and platinum do not react with oxygen.

alkali metals

Magnesium

Answer: Platinum is a noble metal and hence, it does not react with oxygen directly. In contrast Zn, Ti and Fe are active metals and hence directly react with oxygen to form their respective oxides.

Metals such as lead, copper, silver and gold do not react with water at all.

Silver and gold do not react with oxygen even at high temperatures.

Noble metal, any of several metallic chemical elements that have outstanding resistance to oxidation, even at high temperatures; the grouping is not strictly defined but usually is considered to include rhenium, ruthenium, rhodium, palladium, silver, osmium, iridium, platinum, and gold; i.e., the metals of groups VIIb.

titanium, niobium, and tantalum are not included as noble metals despite the fact that they are very resistant to corrosion.

gold