– Zinc reacts with steam to give zinc oxide and hydrogen gas.

Under normal conditions, zinc does not react with water. Zinc oxide is yellow when hot and white when cool. Zn[hot] + H2O[steam]➡ ZnO + H2. The surface of the metallic zinc reacts with the oxygen of the air (O2) in presence of water (H2O), to form zinc hydroxide (Zn (OH) 2).

Zinc does not react with water, because it, too, forms a protective layer of insoluble zinc hydroxide, Zn(OH)2 . The video below shows what happens when copper, zinc, and magnesium samples are placed in HCl , cold water, and hot water.

1) Solid zinc, Zn, reacts with liquid water to produce aqueous zinc hydroxide, Zn(OH)2 , and hydrogen gas, H2.

When zinc reacts with steam, zinc oxide and hydrogen gas are produced. The zinc reacts slower with the steam than magnesium and does not glow brightly as it is converted to zinc oxide. Heating the zinc will speed up the reaction but it will still not burn brightly like the magnesium.

alkali metals

Whenever metals react with water they form metal hydroxides and along with it hydrogen gas is evolved . 3. But Metals like Lead, Aluminium, Iron and Zinc do not react either with cold or hot water at all – because of the formation of oxide layer on its surface which prevent further reaction . Therefore no reaction .

Metals like aluminium, iron and zinc do not react either with cold or hot water. But they react with steam to form the metal oxide and hydrogen. Metals such as lead, copper, silver and gold do not react with water at all.

It reacts with steam when being heated and gives hydrogen gas and metal oxide. Potassium melts to a silvery ball, moves quickly on the water surface with a hissing sound, and burns with a lilac (淡紫色) flame.

lithium, sodium and potassium are less dense than water so they float on the surface of the water. the metals move about the surface of the water and fizz as hydrogen gas is produced.

Density is a measure of how heavy something is compared to its size. If an object is more dense than water it will sink when placed in water, and if it is less dense than water it will float. Density is a characteristic property of a substance and doesn’t depend on the amount of substance.

Ice actually has a very different structure than liquid water, in that the molecules align themselves in a regular lattice rather than more randomly as in the liquid form. It happens that the lattice arrangement allows water molecules to be more spread out than in a liquid, and, thus, ice is less dense than water.

Glass is denser than water because speed of light in glass is less than that of water.

stage 1 : “Kerosene has less density when compared to water because it floats on water like ice. ” Here, we like to prove that “kerosene is less dense when compared to water” this nature of kerosene is the saadhya. When the resultant density of the ship (iron + air) is considered, it is lesser than that of water.

Glass and water are thicker and heavier than air. What happens is that light slows down when it passes from the less dense air into the denser glass or water. This slowing down of the ray of light also causes the ray of light to change direction. It is the change in the speed of the light that causes refraction.

Which of these materials is heavier than water, transparent and breaks easily? wood.

Water, alcohol and Acetone / Benzene.

Applications of Transparent Materials Flat glass is the most recognizable transparent material, but is used in much more than just windows.

The dry leaf floats on water because it contains less starch when compared to fresh leaf . Thus the density will decrease due to less amount of starch in the dry leaf and thus it floats on the surface of water.